Create or expand your DRUM SET with USB and MIDI interface!

Expand your drum set with more pedals and drums (pads or cymbals) up to 6 more elements: full programmable ports, USB and MIDI output.

Oct 15, 2020

•

13700 views

•

7 respects

drums

midi

music

Components and supplies

Arduino Micro

Project description

Code

ard-mididrum.ino

arduino

6 inputs MIDI interface for drums and pedals

1/*
2 * ard-mididrum.ino
3 * 
4 * MIDI interface for 6 inputs as   drum pads 'mono' (variable/analog from piezo sensor) with velocity value
5 *                and   for pedals 'stereo' ("expression" type with potentiometer inside)
6 *                and   for pedals 'mono' ("sustain" type with a switch inside NA or NC)
7 *                
8   * it uses Arduino Micro, USB port as MIDI-OUT device, OLED 128x64 display (setup   and monitor),
9 * rotary encoder + button for setup menu and options, 6 dimmable   leds to monitor 6 inputs activity, 
10 * MIDI-OUT serial port; parameters are memorized   in the MPU EEPROM;
11 * 
12 * 
13 * by Marco Zonca 8-12/2020
14 * 
15*/
16
17/*table
18   * 
19 * octave note pitchNr
20 * -------------------
21 *  -2    C    0
22 *   -2    C#   1
23 *  -2    D    2
24 *  -2    D#   3
25 *  -2    E    4
26 *   -2    F    5
27 *  -2    F#   6    
28 *  -2    G    7
29 *  -2    G#   8
30   *  -2    A    9
31 *  -2    A#   10
32 *  -2    B    11
33 *  
34 *  ...the   same for the other octaves...
35 *  
36 * octave note pitchNr
37 * -------------------
38   *  -1   (C-B)   12-23
39 *   0   (C-B)   24-35
40 *   1   (C-B)   36-47
41 *    2   (C-B)   48-59
42 *   3   (C-B)   60-71
43 *   4   (C-B)   72-83
44 *   5    (C-B)   84-95
45 *   6   (C-B)   96-107
46 *   7   (C-B)   108-119
47 *   8    (C-G)   120-127
48 *   
49 *   PitchNr [0 to 127]
50 *   Octave = ((int(PitchNr   / 12)) - 2)     [-2 to 8]
51 *   Note-Number = (PitchNr-((Octave+2)*12) + 1) [1   to 12]
52 *   
53 *   ----------------------
54 *   for pitchNr the maximum is   127
55 *   for controlNr the maximum is 119
56 *   
57*/
58
59#include "MIDIUSB.h"
60#include   <Wire.h>
61#include <Adafruit_GFX.h>
62#include <Adafruit_SSD1306.h>
63#include   <EEPROM.h>
64
65#define NUM_INPUTS  6
66#define NUM_VALUES  9
67#define IS_DEBUG   false
68
69Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
70
71//   drums or pedals
72const uint8_t input1 = 18;  // A0
73const uint8_t input2 = 19;   // A1
74const uint8_t input3 = 20;  // A2
75const uint8_t input4 = 21;  // A3
76const   uint8_t input5 = 22;  // A4
77const uint8_t input6 = 23;  // A5
78
79// leds
80const   int led1Pin = 13;
81const int led2Pin = 11;
82const int led3Pin = 10;
83const   int led4Pin = 9;
84const int led5Pin = 6;
85const int led6Pin = 5;
86const byte   on = 255;
87const byte off = 0;
88
89const uint8_t inputs[NUM_INPUTS] = {input1,   input2, input3, input4, input5, input6};
90const uint8_t leds[NUM_INPUTS] = {led1Pin,   led2Pin, led3Pin, led4Pin, led5Pin, led6Pin};
91uint8_t prevValue[NUM_INPUTS] =   {0, 0, 0, 0, 0, 0};
92
93byte APitch = 48;
94int AOctave = (int(APitch/12)-2);
95byte   ANote = (APitch-((AOctave+2)*12) + 1);
96char tableNotes[41] = "C  C# D  D# E   F  F# G  G# A  A# B  ";
97char atext[31]="";
98char apark[31]="";
99
100uint8_t   drum_velocity = 0;
101uint8_t velocity = 0;
102uint8_t controlvalue = 0;
103bool   drum_isPressed = false;
104
105uint8_t bType[NUM_INPUTS] = {1, 1, 1, 1, 2, 3};  //   1=piezo drum 2=switch pedal 3=trimmer pedal (default setting)
106
107int KNOBinterval   = 4000; // m/sec to enter Menu
108int KNOBmenuInterval = 1000; // m/sec to navigate   Menu
109
110// rotary encoder
111int menuPin = 4;
112int encoderPin1 = 7;
113int   encoderPin2 = 12;
114volatile int lastEncoded = 0;
115volatile long encoderValue   = 0;
116volatile long encoderPrev = 0;
117volatile boolean IsMenu = false;
118volatile   long lastencoderValue = 0;
119volatile int lastMSB = 0;
120volatile int lastLSB   = 0;
121volatile int knob = 0;
122volatile byte preknob = 1;
123unsigned long prevKNOBmillis   = 0;
124byte menuLevel=0;  // 0-2
125byte menu_L0_Input=0;  // 0-6 0=exit
126byte   menu_L1_Voice=0;  // 0-9 0=back
127byte menu_L2_Value=0;  // 0-127
128byte menu_memory[NUM_INPUTS][NUM_VALUES];
129
130
131/*   Voices 0:Type          1=piezo/drum 2=switch/pedal 3=trimmer/pedal
132 *         1:Reverse        0=no 1=yes (only pedals)
133 *         2:Channel       1-16
134 *         3:PitchNr        0-127 (only drums)
135 *         4:Len           5-95 m/sec (only drums)
136   *         5:Min           0-63
137 *         6:Max           64-127
138 *         7:AntiBouncing   0-63 (only pedals)
139 *         8:ControlNr     0-119 (only pedals)
140 *         
141   */
142
143const byte menu_L2_Value_piezo_min[NUM_VALUES]=  {  1, 255,  1,   0,   5,   0,  64, 255, 255};  // 255=not used
144const byte menu_L2_Value_piezo_max[NUM_VALUES]=   {  3, 255, 16, 127,  95, 63, 127, 255, 255};
145const byte menu_L2_Value_piezo_def[NUM_VALUES]=   {  1, 255,  1,  48,  50, 30, 100, 255, 255};
146const byte menu_L2_Value_switch_min[NUM_VALUES]=   {  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
147const byte menu_L2_Value_switch_max[NUM_VALUES]=   {  3,   1, 16, 255, 255, 63, 127,  63, 119}; 
148const byte menu_L2_Value_switch_def[NUM_VALUES]=   {  2,   1,  1, 255, 255,  0,  70,  60, 102}; 
149const byte menu_L2_Value_trimmer_min[NUM_VALUES]={   1,   0,  1, 255, 255,  0,  64,   0,   0}; 
150const byte menu_L2_Value_trimmer_max[NUM_VALUES]={   3,   1, 16, 255, 255, 63, 127,  63, 119};
151const byte menu_L2_Value_trimmer_def[NUM_VALUES]={   3,   0,  1, 255, 255,  0,  90,   2, 103};
152const byte mId1=0xF1;
153const byte   mId2=0xF2;
154
155void setup() {
156  int mAdr=0;
157  byte a=0;
158  byte b=0;
159   if (IS_DEBUG) Serial.begin(38400);
160  Serial1.begin(31250);  // must be 31250   for MIDI standard
161  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Display Address   0x3C for 128x64 pixels
162  pinMode(encoderPin1, INPUT_PULLUP);
163  pinMode(encoderPin2,   INPUT_PULLUP);
164  pinMode(menuPin, INPUT_PULLUP);
165  pinMode(led1Pin, OUTPUT);
166   pinMode(led2Pin, OUTPUT);
167  pinMode(led3Pin, OUTPUT);
168  pinMode(led4Pin,   OUTPUT);
169  pinMode(led5Pin, OUTPUT);
170  pinMode(led6Pin, OUTPUT);
171
172  mAdr=0;   // read EEPROM first 2 ID bytes and load, if necessary, all default parameters
173   if (EEPROM.read(mAdr) != mId1 || EEPROM.read(mAdr+1) != mId2)  {
174    for (a=0;a<NUM_INPUTS;a++)   {
175      loadDefaults(a, bType[a]);
176    }//for a
177    updateMemory();
178   } else {
179    for (a=0;a<NUM_INPUTS;a++) {  // read EEPROM 54 bytes (addr=2to55)
180       for (b=0;b<NUM_VALUES;b++) {
181        mAdr=(2+(a*9))+b;
182        menu_memory[a][b]=EEPROM.read(mAdr);
183       }
184    }
185  }//if EEPROM.read()
186    
187  for (byte i=0;i<NUM_INPUTS;i++)   {  // pullup for switches
188    switch (menu_memory[i][0]) {  //0=type
189      case   1:  // drum
190      break;
191      case 2:  // switch
192        pinMode(inputs[i],   INPUT_PULLUP);
193      break;
194      case 3:  // trimmer
195      break;
196     }//switch
197  }//for i
198
199  for (int i=1;i<=NUM_INPUTS;i++) {  // leds   show
200    if (i>1) { analogWrite(leds[i-2], off); }
201    analogWrite(leds[i-1],   on);
202    delay(200);
203  }
204  analogWrite(leds[5], off); 
205
206  showNormalDisplay();
207}//setup()
208
209
210void   loop() {
211  if (IsMenu==false) {
212    for (byte i=0;i<NUM_INPUTS;i++) {  //   ----------------- work on inputs
213      switch (menu_memory[i][0]) {  //0=type
214         case 1:  // drum
215          readDrum(i); 
216          break;
217        case   2:  // switch
218          readSwitch(i);
219          break;
220        case 3:   // trimmer
221          readTrimmer(i);
222          break;
223      }  //switch
224     }  // for i
225    if ((prevKNOBmillis+KNOBinterval) < millis()) {  // ----   check menu
226      if (digitalRead(menuPin) == LOW) {
227        IsMenu=true;
228         menuLevel=0;
229        menu_L0_Input=0;
230        if (IS_DEBUG) Serial.println("menu   level 0 (input nr 0-6)");
231        display.clearDisplay();
232        printAt(2,2,false,"SETUP:       type:");
233        printAt(2,4,false,"rev:     min :");
234        printAt(2,5,false,"ch   :     max :");
235        printAt(2,6,false,"ctr:     note:");
236        printAt(2,7,false,"len:      abnc:");
237        displayChoices();
238        display.display();
239      }
240       prevKNOBmillis=millis();
241    }
242   } else {
243    updateEncoder(); 
244   } // if IsMenu()
245}  // loop()
246
247void showNormalDisplay() {  //normal display
248   display.clearDisplay();
249  display.setTextSize(2);
250  display.setTextColor(SSD1306_WHITE);
251   display.setCursor(0,0);
252  display.println("Z-MIDI 6dp");
253  printAt(1,4,false,"Press   knob for setup");
254  printAt(1,6,true,"P T CH RAW VAL NT/CC");
255  display.display();   
256}
257
258void loadDefaults(byte PortNr, byte PortType) {
259  byte a=0;
260   byte b=0;
261  a=PortNr;
262  switch (PortType) {
263    case 1:
264      for   (b=0;b<NUM_VALUES;b++) {
265        menu_memory[a][b]=menu_L2_Value_piezo_def[b];
266       }
267    break;
268    case 2:
269      for (b=0;b<NUM_VALUES;b++) {
270        menu_memory[a][b]=menu_L2_Value_switch_def[b];
271       }
272    break;
273    case 3:
274      for (b=0;b<NUM_VALUES;b++) {
275        menu_memory[a][b]=menu_L2_Value_trimmer_def[b];
276       }
277    break;
278  }//switch(a)
279}//loadDefaults()
280
281void updateMemory()   {
282  int mAdr=0;
283  byte a=0;
284  byte b=0;
285  EEPROM.update(0,mId1);
286   EEPROM.update(1,mId2);
287  for (a=0;a<NUM_INPUTS;a++) {  // update EEPROM 54   bytes (addr=2to55)
288    for (b=0;b<NUM_VALUES;b++) {
289      mAdr=(2+(a*9))+b;
290       EEPROM.update(mAdr,menu_memory[a][b]);
291    }
292  }
293}
294
295void displayChoices()   {  // live display during navigating inside menu
296  switch (menuLevel) {
297    case   0:
298      if (knob==0) {
299        printAt(9,2,true,"exit");
300      } else   {
301        sprintf(atext,"%-4d",knob);
302        printAt(9,2,true,atext);
303       }
304    break;
305    case 1:
306      if (menu_L0_Input==0) {
307        printAt(9,2,false,"exit");
308       } else {
309        sprintf(atext,"%-4d",menu_L0_Input);
310        printAt(9,2,false,atext);
311       }
312      if (menu_memory[menu_L0_Input-1][1-1]==1) {  // ------------- 1=drum
313         sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
314        printAt(20,2,false,atext);
315         printAt(7,4,false,"-");
316        sprintf(atext,"%-2d ",menu_memory[menu_L0_Input-1][6-1]);
317         printAt(17,4,false,atext);
318        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
319         printAt(7,5,false,atext);
320        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
321         printAt(17,5,false,atext);
322        printAt(7,6,false,"---");
323        APitch   = menu_memory[menu_L0_Input-1][4-1];
324        AOctave = ((int(APitch / 12)) -   2);
325        ANote = (APitch-((AOctave+2)*12) + 1);
326        s_substring(apark,   sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
327         sprintf(atext,"%s/%+1d",apark, AOctave);
328        printAt(17,6,false,atext);
329         sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][5-1]);
330        printAt(7,7,false,atext);
331         printAt(17,7,false,"--");
332      } else {   // ----------------------------------------------   2=switch 3=trimmer
333        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
334         printAt(20,2,false,atext);
335        if (menu_memory[menu_L0_Input-1][2-1]==0)   {  // reverse
336          printAt(7,4,false,"N");
337        } else {
338          printAt(7,4,false,"Y");
339         }
340        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][6-1]);
341         printAt(17,4,false,atext);
342        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
343         printAt(7,5,false,atext);
344        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
345         printAt(17,5,false,atext);
346        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][9-1]);
347         printAt(7,6,false,atext);
348        printAt(17,6,false,"--/--");
349         printAt(7,7,false,"--");
350        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][8-1]);
351         printAt(17,7,false,atext);
352      }
353      printAt(8,2,false," ");   // clear pointers ">"
354      printAt(19,2,false," ");
355      printAt(6,4,false,"   ");
356      printAt(6,5,false," ");
357      printAt(16,6,false," ");
358       printAt(6,7,false," ");
359      printAt(16,4,false," ");
360      printAt(16,5,false,"   ");
361      printAt(16,7,false," ");
362      printAt(6,6,false," ");
363       switch(knob) {           // new pointer ">"
364        case 0:
365          printAt(8,2,false,">");
366         break;
367        case 1:
368          printAt(19,2,false,">");
369        break;
370         case 2:
371          printAt(6,4,false,">");
372        break;
373        case   3:
374          printAt(6,5,false,">");
375        break;
376        case 4:
377           printAt(16,6,false,">");
378        break;
379        case 5:
380          printAt(6,7,false,">");
381         break;
382        case 6:
383          printAt(16,4,false,">");
384        break;
385         case 7:
386          printAt(16,5,false,">");
387        break;
388        case   8:
389          printAt(16,7,false,">");
390        break;
391        case 9:
392           printAt(6,6,false,">");
393        break;
394      }//switch(knob)
395     break;
396    case 2:
397      switch(menu_L1_Voice) {  // print new voice's   value
398        case 0:
399        break;
400        case 1:
401          sprintf(atext,"%d",knob);
402           printAt(20,2,true,atext);
403        break;
404        case 2:
405          if   (knob==0) {  // reverse
406            printAt(7,4,true,"N");
407          } else   {
408            printAt(7,4,true,"Y");
409          }
410        break;
411        case   3:
412          sprintf(atext,"%-2d",knob);
413          printAt(7,5,true,atext);
414         break;
415        case 4:
416          APitch = knob;
417          AOctave   = ((int(APitch / 12)) - 2);
418          ANote = (APitch-((AOctave+2)*12) + 1);
419           s_substring(apark, sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1)   * 3, ((ANote-1) * 3)+1);
420          sprintf(atext,"%s/%+1d",apark, AOctave);
421           printAt(17,6,true,atext);
422        break;
423        case 5:
424          sprintf(atext,"%-2d",knob);
425           printAt(7,7,true,atext);
426        break;
427        case 6:
428          sprintf(atext,"%-2d",knob);
429           printAt(17,4,true,atext);
430        break;
431        case 7:
432          sprintf(atext,"%-3d",knob);
433           printAt(17,5,true,atext);
434        break;
435        case 8:
436          sprintf(atext,"%-2d",knob);
437           printAt(17,7,true,atext);
438        break;
439        case 9:
440          sprintf(atext,"%-3d",knob);
441           printAt(7,6,true,atext);
442        break;
443      }//switch(menu_L1_Voice)
444     break;
445  }//switch(menuLevel)
446}
447
448void updateEncoder() {  // ----------------------------------   encoder menu
449  int MSB = digitalRead(encoderPin1); //MSB = most significant bit
450   int LSB = digitalRead(encoderPin2); //LSB = least significant bit
451  int encoded   = (MSB << 1) |LSB; //converting the 2 pin value to single number
452  int sum  =   (lastEncoded << 2) | encoded; //adding it to the previous encoded value
453  if(sum   == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
454   if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue   --;
455  lastEncoded = encoded; //store this value for next time 
456  if ((encoderValue   - encoderPrev) > 8) {  // ------------------ right turn, clockwise ++
457    knob   ++;
458    if (menuLevel==0) if (knob>NUM_INPUTS) knob=0;
459    if (menuLevel==1)   if (knob>9) knob=0;
460    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=3;  // jump n.2 if drum
461    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=0;  // jump n.8 if drum
462    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=0;  // jump n.9 if drum
463    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2   || menu_memory[menu_L0_Input-1][1-1]==3) knob=6;  // jump n.4 if pedal
464    if   (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)   knob=6;  // jump n.5 if pedal
465    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   if (knob > menu_L2_Value_piezo_max[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_min[menu_L1_Voice-1];
466     if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob > menu_L2_Value_switch_max[menu_L1_Voice-1])   knob=menu_L2_Value_switch_min[menu_L1_Voice-1];
467    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)   if (knob > menu_L2_Value_trimmer_max[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_min[menu_L1_Voice-1];
468     if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);   // load defaults if changing PortType 
469    encoderPrev=encoderValue;
470    displayChoices();
471     display.display();
472    if (IS_DEBUG) Serial.println(knob);
473  }
474  if   ((encoderValue - encoderPrev) < -8) {  // ------------------ left turn, anticlockwise   --
475    knob --;
476    if (menuLevel==0) if (knob<0) knob=NUM_INPUTS;
477    if   (menuLevel==1) if (knob<0) knob=9;
478    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=1;  // jump n.2 if drum
479    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=7;  // jump n.8 if drum
480    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=7;  // jump n.9 if drum
481    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2   || menu_memory[menu_L0_Input-1][1-1]==3) knob=3;  // jump n.4 if pedal
482    if   (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)   knob=3;  // jump n.5 if pedal
483    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   if (knob < menu_L2_Value_piezo_min[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_max[menu_L1_Voice-1];
484     if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob < menu_L2_Value_switch_min[menu_L1_Voice-1])   knob=menu_L2_Value_switch_max[menu_L1_Voice-1];
485    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)   if (knob < menu_L2_Value_trimmer_min[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_max[menu_L1_Voice-1];
486     if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);   // load defaults if changing PortType 
487    encoderPrev=encoderValue;
488    displayChoices();
489     display.display();
490    if (IS_DEBUG) Serial.println(knob);
491  }
492  if   (((prevKNOBmillis+KNOBmenuInterval) < millis()) && (digitalRead(menuPin) == LOW))   {  // pressed knob
493    switch (menuLevel) {
494      case 0:
495        if (knob==0)   {  // exit from menu
496          showNormalDisplay();
497          updateMemory();
498           IsMenu=false;
499          if (IS_DEBUG) Serial.println("menu off");
500         } else {  //  chosen input nr
501          menuLevel=1;
502          menu_L0_Input=knob;
503           knob=0;
504          displayChoices();
505          display.display();
506           if (IS_DEBUG) Serial.print("chosen: ");
507          if (IS_DEBUG) Serial.print(menu_L0_Input);
508           if (IS_DEBUG) Serial.println(", menu level 1 (voice 0-9)");
509        }
510         break;
511      case 1:
512        if (knob==0) {  // back previous level   0
513          menuLevel=0;
514          knob=menu_L0_Input;
515          displayChoices();
516           display.display();
517          if (IS_DEBUG) Serial.println("back menu   level 0 (input nr 0-6)");
518        } else {  //  chosen voice
519          menuLevel=2;
520           menu_L1_Voice=knob;
521          knob=menu_memory[menu_L0_Input-1][menu_L1_Voice-1];   // propose value in memory
522          displayChoices();
523          display.display();
524           if (IS_DEBUG) Serial.print("chosen: ");
525          if (IS_DEBUG) Serial.print(menu_L1_Voice);
526           if (IS_DEBUG) Serial.println(", menu level 2 (VALUE 0-127)");
527        }
528         break;
529      case 2:
530        menuLevel=1;  //   save value & back   previous level 1
531        menu_L2_Value=knob;
532        menu_memory[menu_L0_Input-1][menu_L1_Voice-1]=menu_L2_Value;
533         knob=menu_L1_Voice;
534        displayChoices();
535        display.display();
536         if (IS_DEBUG) Serial.print("chosen: ");
537        if (IS_DEBUG) Serial.print(menu_L2_Value);
538         if (IS_DEBUG) Serial.println(", save VALUE & back level 1 (voice 0-9)");
539         break;
540    }  // switch menuLevel
541    prevKNOBmillis=millis();
542   }  // if millis() 
543}  // updateEncoder()
544
545
546void printAt(const byte   col, const byte row, const bool blackonwhite, const char thetext[31]) {  // -------   printAt
547  // display: 21 col. x 8 row [setcursor(x,y)] x=(col-1)*6 y=(row-1)*8
548   // x=0,6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,102,108,114,120 
549  //   y=0,8,16,24,32,40,48,56
550  display.setTextSize(1);
551  if (blackonwhite==true)   {
552    display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // b/w
553  } else   {
554    display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); // normal
555  }
556   display.setCursor((col-1)*6,(row-1)*8);
557  display.print(thetext);
558}  //   printAt()
559
560
561void readSwitch(byte btnr) {  // ----------------------------------   switch
562  int val = 0;
563  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
564   int raw = val;
565  if (val > menu_memory[btnr][6]) {  //6=maxValue
566    val   = menu_memory[btnr][6];
567  }
568  if (val < menu_memory[btnr][5]) {  //5=minValue
569     val = menu_memory[btnr][5];
570  }
571  controlvalue = map(val, menu_memory[btnr][5],   menu_memory[btnr][6], 0, 127);  // expand value  5=minValue 6=maxValue
572  if (controlvalue   < (128/2)) {  // .. off
573    if (menu_memory[btnr][1]==0) {  //1=reverse
574      controlvalue=0;
575     } else {
576      controlvalue=127;
577    }
578  } else {  // .......................   on
579    if (menu_memory[btnr][1]==0) {  //1=reverse
580      controlvalue=127;
581     } else {
582      controlvalue=0;
583    }
584  }
585  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])   || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
586     controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);   //8=controlNr 2=channel
587
588    if (IS_DEBUG) Serial.print(btnr+1);
589    if   (IS_DEBUG) Serial.print(" ");
590    if (IS_DEBUG) Serial.print(menu_memory[btnr][2]);   //2=channel
591    if (IS_DEBUG) Serial.print(" ");
592    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);   //8=controlNr
593    if (IS_DEBUG) Serial.print(" ");
594    if (IS_DEBUG) Serial.print(raw);
595     if (IS_DEBUG) Serial.print(" ");
596    if (IS_DEBUG) Serial.println(controlvalue);
597
598     sprintf(atext,"%d ",btnr+1);  // live monitor
599    printAt(1,7,false,atext);
600     printAt(3,7,false,"S");
601    sprintf(atext,"%d  ",menu_memory[btnr][2]);   //2=channel
602    printAt(5,7,false,atext);
603    sprintf(atext,"%d   ",raw);
604     printAt(8,7,false,atext);
605    sprintf(atext,"%d   ",controlvalue);
606     printAt(12,7,false,atext);
607    sprintf(atext,"%d     ",menu_memory[btnr][8]);   //8=controlNr
608    printAt(16,7,false,atext);
609    display.display();
610
611     prevValue[btnr]=controlvalue;
612    analogWrite(leds[btnr], (controlvalue*2));
613   }
614}  // readSwitch()
615
616void readTrimmer(byte btnr) {  // ----------------------------------   trimmer
617  int val = 0;
618  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
619   int raw = val;
620  if (val > menu_memory[btnr][6]) {  //6=maxValue
621    val   = menu_memory[btnr][6];
622  }
623  if (val < menu_memory[btnr][5]) {  //5=minValue
624     val = menu_memory[btnr][5];
625  }
626  if (menu_memory[btnr][1]==0) { controlvalue   = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 0, 127);}  // expand value   if reverse=no 5=minValue 6=maxValue
627  if (menu_memory[btnr][1]==1) { controlvalue   = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 127, 0);}  // expand value   if reverse=yes 5=minValue 6=maxValue
628  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])   || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
629     controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);   //8=controlNr 2=channel
630
631    if (IS_DEBUG) Serial.print(btnr+1);
632    if   (IS_DEBUG) Serial.print(" ");
633    if (IS_DEBUG) Serial.print((menu_memory[btnr][2]));   //2=channel
634    if (IS_DEBUG) Serial.print(" ");
635    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);   //8=controlNr
636    if (IS_DEBUG) Serial.print(" ");
637    if (IS_DEBUG) Serial.print(raw);
638     if (IS_DEBUG) Serial.print(" ");
639    if (IS_DEBUG) Serial.println(controlvalue);
640
641     sprintf(atext,"%d ",btnr+1);  // live monitor
642    printAt(1,7,false,atext);
643     printAt(3,7,false,"T");
644    sprintf(atext,"%d  ",menu_memory[btnr][2]);   //2=channel
645    printAt(5,7,false,atext);
646    sprintf(atext,"%d   ",raw);
647     printAt(8,7,false,atext);
648    sprintf(atext,"%d   ",controlvalue);
649     printAt(12,7,false,atext);
650    sprintf(atext,"%d     ",menu_memory[btnr][8]);   //8=controlNr
651    printAt(16,7,false,atext);
652    display.display();
653
654     prevValue[btnr]=controlvalue;
655    analogWrite(leds[btnr], (controlvalue*2));
656   }
657}  // readTrimmer()
658
659void readDrum(byte btnr) {  // --------------------------------------   drum
660  int val=0;
661  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
662   int raw = val;
663  while (val >= menu_memory[btnr][5]) {  //5=minValue as threshold
664     drum_isPressed = true;
665    if (val >= drum_velocity) {  // take the peak   of wave
666      drum_velocity=val;
667    }
668    val = map(analogRead(inputs[btnr]),   0, 1023, 0, 127);
669  }//while
670  if (drum_isPressed == true) {
671    if (drum_velocity   > menu_memory[btnr][6]) {  //6=maxValue
672      drum_velocity = menu_memory[btnr][6];
673     }
674    velocity = map(drum_velocity, menu_memory[btnr][5], menu_memory[btnr][6],   1, 127);  // expand velocity 5=minValue 6=maxValue
675    playNoteOn((menu_memory[btnr][2]-1),   menu_memory[btnr][3], velocity);  //3=pitchNr 2=channel
676    
677    if (IS_DEBUG)   Serial.print(btnr+1);
678    if (IS_DEBUG) Serial.print(" ");
679    if (IS_DEBUG)   Serial.print((menu_memory[btnr][2]));  //2=channel
680    if (IS_DEBUG) Serial.print("   ");
681    if (IS_DEBUG) Serial.print(menu_memory[btnr][3]);  //3=pitchNr
682    if   (IS_DEBUG) Serial.print(" ");
683    if (IS_DEBUG) Serial.print(raw);
684    if   (IS_DEBUG) Serial.print(" ");
685    if (IS_DEBUG) Serial.print(velocity);
686     if (IS_DEBUG) Serial.print(" --> ");
687
688    sprintf(atext,"%d ",btnr+1);   // live monitor
689    printAt(1,7,false,atext);
690    printAt(3,7,false,"P");
691     sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
692    printAt(5,7,false,atext);
693     sprintf(atext,"%d   ",raw);
694    printAt(8,7,false,atext);
695    sprintf(atext,"%d    ",velocity);
696    printAt(12,7,false,atext);
697    sprintf(atext,"%d     ",menu_memory[btnr][3]);   //3=pitchNr
698    APitch = menu_memory[btnr][3];
699    AOctave = ((int(APitch   / 12)) - 2);
700    ANote = (APitch-((AOctave+2)*12) + 1);
701    s_substring(apark,   sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
702     sprintf(atext,"%s/%d ",apark,AOctave);
703    printAt(16,7,false,atext);
704     display.display();
705
706    if (IS_DEBUG) Serial.print(APitch);
707    if   (IS_DEBUG) Serial.print(" ");
708    if (IS_DEBUG) Serial.print(AOctave);
709     if (IS_DEBUG) Serial.print(" ");
710    if (IS_DEBUG) Serial.print(ANote);
711     if (IS_DEBUG) Serial.print(" ");
712    if (IS_DEBUG) Serial.println(atext);
713     
714    prevValue[btnr]=velocity;
715    drum_velocity=0;
716    drum_isPressed   = false;
717    analogWrite(leds[btnr], (velocity*2));
718    delay(menu_memory[btnr][4]);   //4=timeinterval
719    analogWrite(leds[btnr], off);
720  }  // if(drum1_isPressed)
721}   // readDrum()
722
723
724// First parameter is the event type (0x0B = control   change) 4 bits
725// Second parameter is the event type, combined with the channel,   above 4 bits + channel 4 bits
726// Third parameter is the control number (0-119).
727//   Fourth parameter is the control value (0-127).
728// --------------------------------------------------------------
729void   controlChange(byte channel, byte control, byte value) {
730  midiEventPacket_t midiCc   = {0x0B, byte (0xB0 | channel), control, value};
731  MidiUSB.sendMIDI(midiCc);   // to USB MIDI
732  MidiUSB.flush();
733  Serial1.write(0xB0 | channel);  // to   serial1 MIDI
734  Serial1.write(control);
735  Serial1.write(value);
736}
737
738//   First parameter is the event type (0x09 = note on, 0x08 = note off) 4 bits
739//   Second parameter is note-on/note-off, combined with the channel, above 4 bits +   channel 4 bits
740// Channel between 0-15. Typically reported to the user as 1-16
741//   Third parameter is the note number, the pitch, (48 = middle C).
742// Fourth parameter   is the velocity (0 = none, 64 = normal, 127 = louder/faster).
743// --------------------------------------------------------------
744void   playNoteOn(byte channel, byte pitch, byte velocity) {
745  midiEventPacket_t noteOn   = {0x09, byte (0x90 | channel), pitch, velocity};
746  MidiUSB.sendMIDI(noteOn);   // to USB MIDI
747  MidiUSB.flush();
748  Serial1.write(0x90 | channel);  // to   serial1 MIDI
749  Serial1.write(pitch);
750  Serial1.write(velocity);
751}
752void   playNoteOff(byte channel, byte pitch, byte velocity) {
753  midiEventPacket_t noteOff   = {0x08, byte (0x80 | channel), pitch, velocity};
754  MidiUSB.sendMIDI(noteOff);   // to USB MIDI
755  MidiUSB.flush();
756  Serial1.write(0x80 | channel);  // to   serial1 MIDI
757  Serial1.write(pitch);
758  Serial1.write(velocity);
759}
760
761//-------------------------------------------------------------------------   SUBSTRING
762bool s_substring(char *dest_string, const int dest_sizeof, const char   *source_string, 
763 const int source_sizeof, const int source_from, const int source_to)   {  // copies source(from, to) to dest
764  if ((source_from < 0) || (source_to <   source_from) || ((source_to - source_from + 1) > (dest_sizeof - 1)) 
765    || (source_to   >= (source_sizeof-1)) || ((source_to - source_from + 1) > (strlen(source_string))))   {
766    dest_string[0]=0;  // NUL
767    return true;  // err 1
768  } else {
769     int _Count=0;
770    for (int i=source_from;i<(source_to+1);i++) {
771      dest_string[_Count]=source_string[i];
772       _Count++;
773    }
774    dest_string[_Count]=0;  // ends with NUL
775    return   false;  // ok 0
776  }
777}  // end s_substring()

/*
 * ard-mididrum.ino
 * 
 * MIDI interface for 6 inputs as   drum pads 'mono' (variable/analog from piezo sensor) with velocity value
 *                and   for pedals 'stereo' ("expression" type with potentiometer inside)
 *                and   for pedals 'mono' ("sustain" type with a switch inside NA or NC)
 *                
   * it uses Arduino Micro, USB port as MIDI-OUT device, OLED 128x64 display (setup   and monitor),
 * rotary encoder + button for setup menu and options, 6 dimmable   leds to monitor 6 inputs activity, 
 * MIDI-OUT serial port; parameters are memorized   in the MPU EEPROM;
 * 
 * 
 * by Marco Zonca 8-12/2020
 * 
*/

/*table
   * 
 * octave note pitchNr
 * -------------------
 *  -2    C    0
 *   -2    C#   1
 *  -2    D    2
 *  -2    D#   3
 *  -2    E    4
 *   -2    F    5
 *  -2    F#   6    
 *  -2    G    7
 *  -2    G#   8
   *  -2    A    9
 *  -2    A#   10
 *  -2    B    11
 *  
 *  ...the   same for the other octaves...
 *  
 * octave note pitchNr
 * -------------------
   *  -1   (C-B)   12-23
 *   0   (C-B)   24-35
 *   1   (C-B)   36-47
 *    2   (C-B)   48-59
 *   3   (C-B)   60-71
 *   4   (C-B)   72-83
 *   5    (C-B)   84-95
 *   6   (C-B)   96-107
 *   7   (C-B)   108-119
 *   8    (C-G)   120-127
 *   
 *   PitchNr [0 to 127]
 *   Octave = ((int(PitchNr   / 12)) - 2)     [-2 to 8]
 *   Note-Number = (PitchNr-((Octave+2)*12) + 1) [1   to 12]
 *   
 *   ----------------------
 *   for pitchNr the maximum is   127
 *   for controlNr the maximum is 119
 *   
*/

#include "MIDIUSB.h"
#include   <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include   <EEPROM.h>

#define NUM_INPUTS  6
#define NUM_VALUES  9
#define IS_DEBUG   false

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

//   drums or pedals
const uint8_t input1 = 18;  // A0
const uint8_t input2 = 19;   // A1
const uint8_t input3 = 20;  // A2
const uint8_t input4 = 21;  // A3
const   uint8_t input5 = 22;  // A4
const uint8_t input6 = 23;  // A5

// leds
const   int led1Pin = 13;
const int led2Pin = 11;
const int led3Pin = 10;
const   int led4Pin = 9;
const int led5Pin = 6;
const int led6Pin = 5;
const byte   on = 255;
const byte off = 0;

const uint8_t inputs[NUM_INPUTS] = {input1,   input2, input3, input4, input5, input6};
const uint8_t leds[NUM_INPUTS] = {led1Pin,   led2Pin, led3Pin, led4Pin, led5Pin, led6Pin};
uint8_t prevValue[NUM_INPUTS] =   {0, 0, 0, 0, 0, 0};

byte APitch = 48;
int AOctave = (int(APitch/12)-2);
byte   ANote = (APitch-((AOctave+2)*12) + 1);
char tableNotes[41] = "C  C# D  D# E   F  F# G  G# A  A# B  ";
char atext[31]="";
char apark[31]="";

uint8_t   drum_velocity = 0;
uint8_t velocity = 0;
uint8_t controlvalue = 0;
bool   drum_isPressed = false;

uint8_t bType[NUM_INPUTS] = {1, 1, 1, 1, 2, 3};  //   1=piezo drum 2=switch pedal 3=trimmer pedal (default setting)

int KNOBinterval   = 4000; // m/sec to enter Menu
int KNOBmenuInterval = 1000; // m/sec to navigate   Menu

// rotary encoder
int menuPin = 4;
int encoderPin1 = 7;
int   encoderPin2 = 12;
volatile int lastEncoded = 0;
volatile long encoderValue   = 0;
volatile long encoderPrev = 0;
volatile boolean IsMenu = false;
volatile   long lastencoderValue = 0;
volatile int lastMSB = 0;
volatile int lastLSB   = 0;
volatile int knob = 0;
volatile byte preknob = 1;
unsigned long prevKNOBmillis   = 0;
byte menuLevel=0;  // 0-2
byte menu_L0_Input=0;  // 0-6 0=exit
byte   menu_L1_Voice=0;  // 0-9 0=back
byte menu_L2_Value=0;  // 0-127
byte menu_memory[NUM_INPUTS][NUM_VALUES];


/*   Voices 0:Type          1=piezo/drum 2=switch/pedal 3=trimmer/pedal
 *         1:Reverse        0=no 1=yes (only pedals)
 *         2:Channel       1-16
 *         3:PitchNr        0-127 (only drums)
 *         4:Len           5-95 m/sec (only drums)
   *         5:Min           0-63
 *         6:Max           64-127
 *         7:AntiBouncing   0-63 (only pedals)
 *         8:ControlNr     0-119 (only pedals)
 *         
   */

const byte menu_L2_Value_piezo_min[NUM_VALUES]=  {  1, 255,  1,   0,   5,   0,  64, 255, 255};  // 255=not used
const byte menu_L2_Value_piezo_max[NUM_VALUES]=   {  3, 255, 16, 127,  95, 63, 127, 255, 255};
const byte menu_L2_Value_piezo_def[NUM_VALUES]=   {  1, 255,  1,  48,  50, 30, 100, 255, 255};
const byte menu_L2_Value_switch_min[NUM_VALUES]=   {  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
const byte menu_L2_Value_switch_max[NUM_VALUES]=   {  3,   1, 16, 255, 255, 63, 127,  63, 119}; 
const byte menu_L2_Value_switch_def[NUM_VALUES]=   {  2,   1,  1, 255, 255,  0,  70,  60, 102}; 
const byte menu_L2_Value_trimmer_min[NUM_VALUES]={   1,   0,  1, 255, 255,  0,  64,   0,   0}; 
const byte menu_L2_Value_trimmer_max[NUM_VALUES]={   3,   1, 16, 255, 255, 63, 127,  63, 119};
const byte menu_L2_Value_trimmer_def[NUM_VALUES]={   3,   0,  1, 255, 255,  0,  90,   2, 103};
const byte mId1=0xF1;
const byte   mId2=0xF2;

void setup() {
  int mAdr=0;
  byte a=0;
  byte b=0;
   if (IS_DEBUG) Serial.begin(38400);
  Serial1.begin(31250);  // must be 31250   for MIDI standard
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Display Address   0x3C for 128x64 pixels
  pinMode(encoderPin1, INPUT_PULLUP);
  pinMode(encoderPin2,   INPUT_PULLUP);
  pinMode(menuPin, INPUT_PULLUP);
  pinMode(led1Pin, OUTPUT);
   pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin,   OUTPUT);
  pinMode(led5Pin, OUTPUT);
  pinMode(led6Pin, OUTPUT);

  mAdr=0;   // read EEPROM first 2 ID bytes and load, if necessary, all default parameters
   if (EEPROM.read(mAdr) != mId1 || EEPROM.read(mAdr+1) != mId2)  {
    for (a=0;a<NUM_INPUTS;a++)   {
      loadDefaults(a, bType[a]);
    }//for a
    updateMemory();
   } else {
    for (a=0;a<NUM_INPUTS;a++) {  // read EEPROM 54 bytes (addr=2to55)
       for (b=0;b<NUM_VALUES;b++) {
        mAdr=(2+(a*9))+b;
        menu_memory[a][b]=EEPROM.read(mAdr);
       }
    }
  }//if EEPROM.read()
    
  for (byte i=0;i<NUM_INPUTS;i++)   {  // pullup for switches
    switch (menu_memory[i][0]) {  //0=type
      case   1:  // drum
      break;
      case 2:  // switch
        pinMode(inputs[i],   INPUT_PULLUP);
      break;
      case 3:  // trimmer
      break;
     }//switch
  }//for i

  for (int i=1;i<=NUM_INPUTS;i++) {  // leds   show
    if (i>1) { analogWrite(leds[i-2], off); }
    analogWrite(leds[i-1],   on);
    delay(200);
  }
  analogWrite(leds[5], off); 

  showNormalDisplay();
}//setup()


void   loop() {
  if (IsMenu==false) {
    for (byte i=0;i<NUM_INPUTS;i++) {  //   ----------------- work on inputs
      switch (menu_memory[i][0]) {  //0=type
         case 1:  // drum
          readDrum(i); 
          break;
        case   2:  // switch
          readSwitch(i);
          break;
        case 3:   // trimmer
          readTrimmer(i);
          break;
      }  //switch
     }  // for i
    if ((prevKNOBmillis+KNOBinterval) < millis()) {  // ----   check menu
      if (digitalRead(menuPin) == LOW) {
        IsMenu=true;
         menuLevel=0;
        menu_L0_Input=0;
        if (IS_DEBUG) Serial.println("menu   level 0 (input nr 0-6)");
        display.clearDisplay();
        printAt(2,2,false,"SETUP:       type:");
        printAt(2,4,false,"rev:     min :");
        printAt(2,5,false,"ch   :     max :");
        printAt(2,6,false,"ctr:     note:");
        printAt(2,7,false,"len:      abnc:");
        displayChoices();
        display.display();
      }
       prevKNOBmillis=millis();
    }
   } else {
    updateEncoder(); 
   } // if IsMenu()
}  // loop()

void showNormalDisplay() {  //normal display
   display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
   display.setCursor(0,0);
  display.println("Z-MIDI 6dp");
  printAt(1,4,false,"Press   knob for setup");
  printAt(1,6,true,"P T CH RAW VAL NT/CC");
  display.display();   
}

void loadDefaults(byte PortNr, byte PortType) {
  byte a=0;
   byte b=0;
  a=PortNr;
  switch (PortType) {
    case 1:
      for   (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_piezo_def[b];
       }
    break;
    case 2:
      for (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_switch_def[b];
       }
    break;
    case 3:
      for (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_trimmer_def[b];
       }
    break;
  }//switch(a)
}//loadDefaults()

void updateMemory()   {
  int mAdr=0;
  byte a=0;
  byte b=0;
  EEPROM.update(0,mId1);
   EEPROM.update(1,mId2);
  for (a=0;a<NUM_INPUTS;a++) {  // update EEPROM 54   bytes (addr=2to55)
    for (b=0;b<NUM_VALUES;b++) {
      mAdr=(2+(a*9))+b;
       EEPROM.update(mAdr,menu_memory[a][b]);
    }
  }
}

void displayChoices()   {  // live display during navigating inside menu
  switch (menuLevel) {
    case   0:
      if (knob==0) {
        printAt(9,2,true,"exit");
      } else   {
        sprintf(atext,"%-4d",knob);
        printAt(9,2,true,atext);
       }
    break;
    case 1:
      if (menu_L0_Input==0) {
        printAt(9,2,false,"exit");
       } else {
        sprintf(atext,"%-4d",menu_L0_Input);
        printAt(9,2,false,atext);
       }
      if (menu_memory[menu_L0_Input-1][1-1]==1) {  // ------------- 1=drum
         sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
        printAt(20,2,false,atext);
         printAt(7,4,false,"-");
        sprintf(atext,"%-2d ",menu_memory[menu_L0_Input-1][6-1]);
         printAt(17,4,false,atext);
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
         printAt(7,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
         printAt(17,5,false,atext);
        printAt(7,6,false,"---");
        APitch   = menu_memory[menu_L0_Input-1][4-1];
        AOctave = ((int(APitch / 12)) -   2);
        ANote = (APitch-((AOctave+2)*12) + 1);
        s_substring(apark,   sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
         sprintf(atext,"%s/%+1d",apark, AOctave);
        printAt(17,6,false,atext);
         sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][5-1]);
        printAt(7,7,false,atext);
         printAt(17,7,false,"--");
      } else {   // ----------------------------------------------   2=switch 3=trimmer
        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
         printAt(20,2,false,atext);
        if (menu_memory[menu_L0_Input-1][2-1]==0)   {  // reverse
          printAt(7,4,false,"N");
        } else {
          printAt(7,4,false,"Y");
         }
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][6-1]);
         printAt(17,4,false,atext);
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
         printAt(7,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
         printAt(17,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][9-1]);
         printAt(7,6,false,atext);
        printAt(17,6,false,"--/--");
         printAt(7,7,false,"--");
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][8-1]);
         printAt(17,7,false,atext);
      }
      printAt(8,2,false," ");   // clear pointers ">"
      printAt(19,2,false," ");
      printAt(6,4,false,"   ");
      printAt(6,5,false," ");
      printAt(16,6,false," ");
       printAt(6,7,false," ");
      printAt(16,4,false," ");
      printAt(16,5,false,"   ");
      printAt(16,7,false," ");
      printAt(6,6,false," ");
       switch(knob) {           // new pointer ">"
        case 0:
          printAt(8,2,false,">");
         break;
        case 1:
          printAt(19,2,false,">");
        break;
         case 2:
          printAt(6,4,false,">");
        break;
        case   3:
          printAt(6,5,false,">");
        break;
        case 4:
           printAt(16,6,false,">");
        break;
        case 5:
          printAt(6,7,false,">");
         break;
        case 6:
          printAt(16,4,false,">");
        break;
         case 7:
          printAt(16,5,false,">");
        break;
        case   8:
          printAt(16,7,false,">");
        break;
        case 9:
           printAt(6,6,false,">");
        break;
      }//switch(knob)
     break;
    case 2:
      switch(menu_L1_Voice) {  // print new voice's   value
        case 0:
        break;
        case 1:
          sprintf(atext,"%d",knob);
           printAt(20,2,true,atext);
        break;
        case 2:
          if   (knob==0) {  // reverse
            printAt(7,4,true,"N");
          } else   {
            printAt(7,4,true,"Y");
          }
        break;
        case   3:
          sprintf(atext,"%-2d",knob);
          printAt(7,5,true,atext);
         break;
        case 4:
          APitch = knob;
          AOctave   = ((int(APitch / 12)) - 2);
          ANote = (APitch-((AOctave+2)*12) + 1);
           s_substring(apark, sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1)   * 3, ((ANote-1) * 3)+1);
          sprintf(atext,"%s/%+1d",apark, AOctave);
           printAt(17,6,true,atext);
        break;
        case 5:
          sprintf(atext,"%-2d",knob);
           printAt(7,7,true,atext);
        break;
        case 6:
          sprintf(atext,"%-2d",knob);
           printAt(17,4,true,atext);
        break;
        case 7:
          sprintf(atext,"%-3d",knob);
           printAt(17,5,true,atext);
        break;
        case 8:
          sprintf(atext,"%-2d",knob);
           printAt(17,7,true,atext);
        break;
        case 9:
          sprintf(atext,"%-3d",knob);
           printAt(7,6,true,atext);
        break;
      }//switch(menu_L1_Voice)
     break;
  }//switch(menuLevel)
}

void updateEncoder() {  // ----------------------------------   encoder menu
  int MSB = digitalRead(encoderPin1); //MSB = most significant bit
   int LSB = digitalRead(encoderPin2); //LSB = least significant bit
  int encoded   = (MSB << 1) |LSB; //converting the 2 pin value to single number
  int sum  =   (lastEncoded << 2) | encoded; //adding it to the previous encoded value
  if(sum   == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
   if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue   --;
  lastEncoded = encoded; //store this value for next time 
  if ((encoderValue   - encoderPrev) > 8) {  // ------------------ right turn, clockwise ++
    knob   ++;
    if (menuLevel==0) if (knob>NUM_INPUTS) knob=0;
    if (menuLevel==1)   if (knob>9) knob=0;
    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=3;  // jump n.2 if drum
    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=0;  // jump n.8 if drum
    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=0;  // jump n.9 if drum
    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2   || menu_memory[menu_L0_Input-1][1-1]==3) knob=6;  // jump n.4 if pedal
    if   (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)   knob=6;  // jump n.5 if pedal
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   if (knob > menu_L2_Value_piezo_max[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_min[menu_L1_Voice-1];
     if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob > menu_L2_Value_switch_max[menu_L1_Voice-1])   knob=menu_L2_Value_switch_min[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)   if (knob > menu_L2_Value_trimmer_max[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_min[menu_L1_Voice-1];
     if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);   // load defaults if changing PortType 
    encoderPrev=encoderValue;
    displayChoices();
     display.display();
    if (IS_DEBUG) Serial.println(knob);
  }
  if   ((encoderValue - encoderPrev) < -8) {  // ------------------ left turn, anticlockwise   --
    knob --;
    if (menuLevel==0) if (knob<0) knob=NUM_INPUTS;
    if   (menuLevel==1) if (knob<0) knob=9;
    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=1;  // jump n.2 if drum
    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=7;  // jump n.8 if drum
    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)   knob=7;  // jump n.9 if drum
    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2   || menu_memory[menu_L0_Input-1][1-1]==3) knob=3;  // jump n.4 if pedal
    if   (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)   knob=3;  // jump n.5 if pedal
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)   if (knob < menu_L2_Value_piezo_min[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_max[menu_L1_Voice-1];
     if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob < menu_L2_Value_switch_min[menu_L1_Voice-1])   knob=menu_L2_Value_switch_max[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)   if (knob < menu_L2_Value_trimmer_min[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_max[menu_L1_Voice-1];
     if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);   // load defaults if changing PortType 
    encoderPrev=encoderValue;
    displayChoices();
     display.display();
    if (IS_DEBUG) Serial.println(knob);
  }
  if   (((prevKNOBmillis+KNOBmenuInterval) < millis()) && (digitalRead(menuPin) == LOW))   {  // pressed knob
    switch (menuLevel) {
      case 0:
        if (knob==0)   {  // exit from menu
          showNormalDisplay();
          updateMemory();
           IsMenu=false;
          if (IS_DEBUG) Serial.println("menu off");
         } else {  //  chosen input nr
          menuLevel=1;
          menu_L0_Input=knob;
           knob=0;
          displayChoices();
          display.display();
           if (IS_DEBUG) Serial.print("chosen: ");
          if (IS_DEBUG) Serial.print(menu_L0_Input);
           if (IS_DEBUG) Serial.println(", menu level 1 (voice 0-9)");
        }
         break;
      case 1:
        if (knob==0) {  // back previous level   0
          menuLevel=0;
          knob=menu_L0_Input;
          displayChoices();
           display.display();
          if (IS_DEBUG) Serial.println("back menu   level 0 (input nr 0-6)");
        } else {  //  chosen voice
          menuLevel=2;
           menu_L1_Voice=knob;
          knob=menu_memory[menu_L0_Input-1][menu_L1_Voice-1];   // propose value in memory
          displayChoices();
          display.display();
           if (IS_DEBUG) Serial.print("chosen: ");
          if (IS_DEBUG) Serial.print(menu_L1_Voice);
           if (IS_DEBUG) Serial.println(", menu level 2 (VALUE 0-127)");
        }
         break;
      case 2:
        menuLevel=1;  //   save value & back   previous level 1
        menu_L2_Value=knob;
        menu_memory[menu_L0_Input-1][menu_L1_Voice-1]=menu_L2_Value;
         knob=menu_L1_Voice;
        displayChoices();
        display.display();
         if (IS_DEBUG) Serial.print("chosen: ");
        if (IS_DEBUG) Serial.print(menu_L2_Value);
         if (IS_DEBUG) Serial.println(", save VALUE & back level 1 (voice 0-9)");
         break;
    }  // switch menuLevel
    prevKNOBmillis=millis();
   }  // if millis() 
}  // updateEncoder()


void printAt(const byte   col, const byte row, const bool blackonwhite, const char thetext[31]) {  // -------   printAt
  // display: 21 col. x 8 row [setcursor(x,y)] x=(col-1)*6 y=(row-1)*8
   // x=0,6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,102,108,114,120 
  //   y=0,8,16,24,32,40,48,56
  display.setTextSize(1);
  if (blackonwhite==true)   {
    display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // b/w
  } else   {
    display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); // normal
  }
   display.setCursor((col-1)*6,(row-1)*8);
  display.print(thetext);
}  //   printAt()


void readSwitch(byte btnr) {  // ----------------------------------   switch
  int val = 0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
   int raw = val;
  if (val > menu_memory[btnr][6]) {  //6=maxValue
    val   = menu_memory[btnr][6];
  }
  if (val < menu_memory[btnr][5]) {  //5=minValue
     val = menu_memory[btnr][5];
  }
  controlvalue = map(val, menu_memory[btnr][5],   menu_memory[btnr][6], 0, 127);  // expand value  5=minValue 6=maxValue
  if (controlvalue   < (128/2)) {  // .. off
    if (menu_memory[btnr][1]==0) {  //1=reverse
      controlvalue=0;
     } else {
      controlvalue=127;
    }
  } else {  // .......................   on
    if (menu_memory[btnr][1]==0) {  //1=reverse
      controlvalue=127;
     } else {
      controlvalue=0;
    }
  }
  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])   || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
     controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);   //8=controlNr 2=channel

    if (IS_DEBUG) Serial.print(btnr+1);
    if   (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][2]);   //2=channel
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);   //8=controlNr
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
     if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(controlvalue);

     sprintf(atext,"%d ",btnr+1);  // live monitor
    printAt(1,7,false,atext);
     printAt(3,7,false,"S");
    sprintf(atext,"%d  ",menu_memory[btnr][2]);   //2=channel
    printAt(5,7,false,atext);
    sprintf(atext,"%d   ",raw);
     printAt(8,7,false,atext);
    sprintf(atext,"%d   ",controlvalue);
     printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][8]);   //8=controlNr
    printAt(16,7,false,atext);
    display.display();

     prevValue[btnr]=controlvalue;
    analogWrite(leds[btnr], (controlvalue*2));
   }
}  // readSwitch()

void readTrimmer(byte btnr) {  // ----------------------------------   trimmer
  int val = 0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
   int raw = val;
  if (val > menu_memory[btnr][6]) {  //6=maxValue
    val   = menu_memory[btnr][6];
  }
  if (val < menu_memory[btnr][5]) {  //5=minValue
     val = menu_memory[btnr][5];
  }
  if (menu_memory[btnr][1]==0) { controlvalue   = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 0, 127);}  // expand value   if reverse=no 5=minValue 6=maxValue
  if (menu_memory[btnr][1]==1) { controlvalue   = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 127, 0);}  // expand value   if reverse=yes 5=minValue 6=maxValue
  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])   || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
     controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);   //8=controlNr 2=channel

    if (IS_DEBUG) Serial.print(btnr+1);
    if   (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print((menu_memory[btnr][2]));   //2=channel
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);   //8=controlNr
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
     if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(controlvalue);

     sprintf(atext,"%d ",btnr+1);  // live monitor
    printAt(1,7,false,atext);
     printAt(3,7,false,"T");
    sprintf(atext,"%d  ",menu_memory[btnr][2]);   //2=channel
    printAt(5,7,false,atext);
    sprintf(atext,"%d   ",raw);
     printAt(8,7,false,atext);
    sprintf(atext,"%d   ",controlvalue);
     printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][8]);   //8=controlNr
    printAt(16,7,false,atext);
    display.display();

     prevValue[btnr]=controlvalue;
    analogWrite(leds[btnr], (controlvalue*2));
   }
}  // readTrimmer()

void readDrum(byte btnr) {  // --------------------------------------   drum
  int val=0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
   int raw = val;
  while (val >= menu_memory[btnr][5]) {  //5=minValue as threshold
     drum_isPressed = true;
    if (val >= drum_velocity) {  // take the peak   of wave
      drum_velocity=val;
    }
    val = map(analogRead(inputs[btnr]),   0, 1023, 0, 127);
  }//while
  if (drum_isPressed == true) {
    if (drum_velocity   > menu_memory[btnr][6]) {  //6=maxValue
      drum_velocity = menu_memory[btnr][6];
     }
    velocity = map(drum_velocity, menu_memory[btnr][5], menu_memory[btnr][6],   1, 127);  // expand velocity 5=minValue 6=maxValue
    playNoteOn((menu_memory[btnr][2]-1),   menu_memory[btnr][3], velocity);  //3=pitchNr 2=channel
    
    if (IS_DEBUG)   Serial.print(btnr+1);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG)   Serial.print((menu_memory[btnr][2]));  //2=channel
    if (IS_DEBUG) Serial.print("   ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][3]);  //3=pitchNr
    if   (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
    if   (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(velocity);
     if (IS_DEBUG) Serial.print(" --> ");

    sprintf(atext,"%d ",btnr+1);   // live monitor
    printAt(1,7,false,atext);
    printAt(3,7,false,"P");
     sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
    printAt(5,7,false,atext);
     sprintf(atext,"%d   ",raw);
    printAt(8,7,false,atext);
    sprintf(atext,"%d    ",velocity);
    printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][3]);   //3=pitchNr
    APitch = menu_memory[btnr][3];
    AOctave = ((int(APitch   / 12)) - 2);
    ANote = (APitch-((AOctave+2)*12) + 1);
    s_substring(apark,   sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
     sprintf(atext,"%s/%d ",apark,AOctave);
    printAt(16,7,false,atext);
     display.display();

    if (IS_DEBUG) Serial.print(APitch);
    if   (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(AOctave);
     if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(ANote);
     if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(atext);
     
    prevValue[btnr]=velocity;
    drum_velocity=0;
    drum_isPressed   = false;
    analogWrite(leds[btnr], (velocity*2));
    delay(menu_memory[btnr][4]);   //4=timeinterval
    analogWrite(leds[btnr], off);
  }  // if(drum1_isPressed)
}   // readDrum()


// First parameter is the event type (0x0B = control   change) 4 bits
// Second parameter is the event type, combined with the channel,   above 4 bits + channel 4 bits
// Third parameter is the control number (0-119).
//   Fourth parameter is the control value (0-127).
// --------------------------------------------------------------
void   controlChange(byte channel, byte control, byte value) {
  midiEventPacket_t midiCc   = {0x0B, byte (0xB0 | channel), control, value};
  MidiUSB.sendMIDI(midiCc);   // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0xB0 | channel);  // to   serial1 MIDI
  Serial1.write(control);
  Serial1.write(value);
}

//   First parameter is the event type (0x09 = note on, 0x08 = note off) 4 bits
//   Second parameter is note-on/note-off, combined with the channel, above 4 bits +   channel 4 bits
// Channel between 0-15. Typically reported to the user as 1-16
//   Third parameter is the note number, the pitch, (48 = middle C).
// Fourth parameter   is the velocity (0 = none, 64 = normal, 127 = louder/faster).
// --------------------------------------------------------------
void   playNoteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn   = {0x09, byte (0x90 | channel), pitch, velocity};
  MidiUSB.sendMIDI(noteOn);   // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0x90 | channel);  // to   serial1 MIDI
  Serial1.write(pitch);
  Serial1.write(velocity);
}
void   playNoteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff   = {0x08, byte (0x80 | channel), pitch, velocity};
  MidiUSB.sendMIDI(noteOff);   // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0x80 | channel);  // to   serial1 MIDI
  Serial1.write(pitch);
  Serial1.write(velocity);
}

//-------------------------------------------------------------------------   SUBSTRING
bool s_substring(char *dest_string, const int dest_sizeof, const char   *source_string, 
 const int source_sizeof, const int source_from, const int source_to)   {  // copies source(from, to) to dest
  if ((source_from < 0) || (source_to <   source_from) || ((source_to - source_from + 1) > (dest_sizeof - 1)) 
    || (source_to   >= (source_sizeof-1)) || ((source_to - source_from + 1) > (strlen(source_string))))   {
    dest_string[0]=0;  // NUL
    return true;  // err 1
  } else {
     int _Count=0;
    for (int i=source_from;i<(source_to+1);i++) {
      dest_string[_Count]=source_string[i];
       _Count++;
    }
    dest_string[_Count]=0;  // ends with NUL
    return   false;  // ok 0
  }
}  // end s_substring()

ard-mididrum.ino

arduino

6 inputs MIDI interface for drums and pedals

1/*
2 * ard-mididrum.ino
3 * 
4 * MIDI interface for 6 inputs as  drum pads 'mono' (variable/analog from piezo sensor) with velocity value
5 *                and  for pedals 'stereo' ("expression" type with potentiometer inside)
6 *                and  for pedals 'mono' ("sustain" type with a switch inside NA or NC)
7 *                
8  * it uses Arduino Micro, USB port as MIDI-OUT device, OLED 128x64 display (setup  and monitor),
9 * rotary encoder + button for setup menu and options, 6 dimmable  leds to monitor 6 inputs activity, 
10 * MIDI-OUT serial port; parameters are memorized  in the MPU EEPROM;
11 * 
12 * 
13 * by Marco Zonca 8-12/2020
14 * 
15*/
16
17/*table
18  * 
19 * octave note pitchNr
20 * -------------------
21 *  -2    C    0
22 *  -2    C#   1
23 *  -2    D    2
24 *  -2    D#   3
25 *  -2    E    4
26 *  -2    F    5
27 *  -2    F#   6    
28 *  -2    G    7
29 *  -2    G#   8
30  *  -2    A    9
31 *  -2    A#   10
32 *  -2    B    11
33 *  
34 *  ...the  same for the other octaves...
35 *  
36 * octave note pitchNr
37 * -------------------
38  *  -1   (C-B)   12-23
39 *   0   (C-B)   24-35
40 *   1   (C-B)   36-47
41 *   2   (C-B)   48-59
42 *   3   (C-B)   60-71
43 *   4   (C-B)   72-83
44 *   5   (C-B)   84-95
45 *   6   (C-B)   96-107
46 *   7   (C-B)   108-119
47 *   8   (C-G)   120-127
48 *   
49 *   PitchNr [0 to 127]
50 *   Octave = ((int(PitchNr  / 12)) - 2)     [-2 to 8]
51 *   Note-Number = (PitchNr-((Octave+2)*12) + 1) [1  to 12]
52 *   
53 *   ----------------------
54 *   for pitchNr the maximum is  127
55 *   for controlNr the maximum is 119
56 *   
57*/
58
59#include "MIDIUSB.h"
60#include  <Wire.h>
61#include <Adafruit_GFX.h>
62#include <Adafruit_SSD1306.h>
63#include  <EEPROM.h>
64
65#define NUM_INPUTS  6
66#define NUM_VALUES  9
67#define IS_DEBUG  false
68
69Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
70
71//  drums or pedals
72const uint8_t input1 = 18;  // A0
73const uint8_t input2 = 19;  // A1
74const uint8_t input3 = 20;  // A2
75const uint8_t input4 = 21;  // A3
76const  uint8_t input5 = 22;  // A4
77const uint8_t input6 = 23;  // A5
78
79// leds
80const  int led1Pin = 13;
81const int led2Pin = 11;
82const int led3Pin = 10;
83const  int led4Pin = 9;
84const int led5Pin = 6;
85const int led6Pin = 5;
86const byte  on = 255;
87const byte off = 0;
88
89const uint8_t inputs[NUM_INPUTS] = {input1,  input2, input3, input4, input5, input6};
90const uint8_t leds[NUM_INPUTS] = {led1Pin,  led2Pin, led3Pin, led4Pin, led5Pin, led6Pin};
91uint8_t prevValue[NUM_INPUTS] =  {0, 0, 0, 0, 0, 0};
92
93byte APitch = 48;
94int AOctave = (int(APitch/12)-2);
95byte  ANote = (APitch-((AOctave+2)*12) + 1);
96char tableNotes[41] = "C  C# D  D# E  F  F# G  G# A  A# B  ";
97char atext[31]="";
98char apark[31]="";
99
100uint8_t  drum_velocity = 0;
101uint8_t velocity = 0;
102uint8_t controlvalue = 0;
103bool  drum_isPressed = false;
104
105uint8_t bType[NUM_INPUTS] = {1, 1, 1, 1, 2, 3};  //  1=piezo drum 2=switch pedal 3=trimmer pedal (default setting)
106
107int KNOBinterval  = 4000; // m/sec to enter Menu
108int KNOBmenuInterval = 1000; // m/sec to navigate  Menu
109
110// rotary encoder
111int menuPin = 4;
112int encoderPin1 = 7;
113int  encoderPin2 = 12;
114volatile int lastEncoded = 0;
115volatile long encoderValue  = 0;
116volatile long encoderPrev = 0;
117volatile boolean IsMenu = false;
118volatile  long lastencoderValue = 0;
119volatile int lastMSB = 0;
120volatile int lastLSB  = 0;
121volatile int knob = 0;
122volatile byte preknob = 1;
123unsigned long prevKNOBmillis  = 0;
124byte menuLevel=0;  // 0-2
125byte menu_L0_Input=0;  // 0-6 0=exit
126byte  menu_L1_Voice=0;  // 0-9 0=back
127byte menu_L2_Value=0;  // 0-127
128byte menu_memory[NUM_INPUTS][NUM_VALUES];
129
130
131/*  Voices 0:Type          1=piezo/drum 2=switch/pedal 3=trimmer/pedal
132 *         1:Reverse       0=no 1=yes (only pedals)
133 *         2:Channel       1-16
134 *         3:PitchNr       0-127 (only drums)
135 *         4:Len           5-95 m/sec (only drums)
136  *         5:Min           0-63
137 *         6:Max           64-127
138 *         7:AntiBouncing  0-63 (only pedals)
139 *         8:ControlNr     0-119 (only pedals)
140 *         
141  */
142
143const byte menu_L2_Value_piezo_min[NUM_VALUES]=  {  1, 255,  1,   0,   5,  0,  64, 255, 255};  // 255=not used
144const byte menu_L2_Value_piezo_max[NUM_VALUES]=  {  3, 255, 16, 127,  95, 63, 127, 255, 255};
145const byte menu_L2_Value_piezo_def[NUM_VALUES]=  {  1, 255,  1,  48,  50, 30, 100, 255, 255};
146const byte menu_L2_Value_switch_min[NUM_VALUES]=  {  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
147const byte menu_L2_Value_switch_max[NUM_VALUES]=  {  3,   1, 16, 255, 255, 63, 127,  63, 119}; 
148const byte menu_L2_Value_switch_def[NUM_VALUES]=  {  2,   1,  1, 255, 255,  0,  70,  60, 102}; 
149const byte menu_L2_Value_trimmer_min[NUM_VALUES]={  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
150const byte menu_L2_Value_trimmer_max[NUM_VALUES]={  3,   1, 16, 255, 255, 63, 127,  63, 119};
151const byte menu_L2_Value_trimmer_def[NUM_VALUES]={  3,   0,  1, 255, 255,  0,  90,   2, 103};
152const byte mId1=0xF1;
153const byte  mId2=0xF2;
154
155void setup() {
156  int mAdr=0;
157  byte a=0;
158  byte b=0;
159  if (IS_DEBUG) Serial.begin(38400);
160  Serial1.begin(31250);  // must be 31250  for MIDI standard
161  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Display Address  0x3C for 128x64 pixels
162  pinMode(encoderPin1, INPUT_PULLUP);
163  pinMode(encoderPin2,  INPUT_PULLUP);
164  pinMode(menuPin, INPUT_PULLUP);
165  pinMode(led1Pin, OUTPUT);
166  pinMode(led2Pin, OUTPUT);
167  pinMode(led3Pin, OUTPUT);
168  pinMode(led4Pin,  OUTPUT);
169  pinMode(led5Pin, OUTPUT);
170  pinMode(led6Pin, OUTPUT);
171
172  mAdr=0;  // read EEPROM first 2 ID bytes and load, if necessary, all default parameters
173  if (EEPROM.read(mAdr) != mId1 || EEPROM.read(mAdr+1) != mId2)  {
174    for (a=0;a<NUM_INPUTS;a++)  {
175      loadDefaults(a, bType[a]);
176    }//for a
177    updateMemory();
178  } else {
179    for (a=0;a<NUM_INPUTS;a++) {  // read EEPROM 54 bytes (addr=2to55)
180      for (b=0;b<NUM_VALUES;b++) {
181        mAdr=(2+(a*9))+b;
182        menu_memory[a][b]=EEPROM.read(mAdr);
183      }
184    }
185  }//if EEPROM.read()
186    
187  for (byte i=0;i<NUM_INPUTS;i++)  {  // pullup for switches
188    switch (menu_memory[i][0]) {  //0=type
189      case  1:  // drum
190      break;
191      case 2:  // switch
192        pinMode(inputs[i],  INPUT_PULLUP);
193      break;
194      case 3:  // trimmer
195      break;
196    }//switch
197  }//for i
198
199  for (int i=1;i<=NUM_INPUTS;i++) {  // leds  show
200    if (i>1) { analogWrite(leds[i-2], off); }
201    analogWrite(leds[i-1],  on);
202    delay(200);
203  }
204  analogWrite(leds[5], off); 
205
206  showNormalDisplay();
207}//setup()
208
209
210void  loop() {
211  if (IsMenu==false) {
212    for (byte i=0;i<NUM_INPUTS;i++) {  //  ----------------- work on inputs
213      switch (menu_memory[i][0]) {  //0=type
214        case 1:  // drum
215          readDrum(i); 
216          break;
217        case  2:  // switch
218          readSwitch(i);
219          break;
220        case 3:  // trimmer
221          readTrimmer(i);
222          break;
223      }  //switch
224    }  // for i
225    if ((prevKNOBmillis+KNOBinterval) < millis()) {  // ----  check menu
226      if (digitalRead(menuPin) == LOW) {
227        IsMenu=true;
228        menuLevel=0;
229        menu_L0_Input=0;
230        if (IS_DEBUG) Serial.println("menu  level 0 (input nr 0-6)");
231        display.clearDisplay();
232        printAt(2,2,false,"SETUP:      type:");
233        printAt(2,4,false,"rev:     min :");
234        printAt(2,5,false,"ch  :     max :");
235        printAt(2,6,false,"ctr:     note:");
236        printAt(2,7,false,"len:     abnc:");
237        displayChoices();
238        display.display();
239      }
240      prevKNOBmillis=millis();
241    }
242   } else {
243    updateEncoder(); 
244  } // if IsMenu()
245}  // loop()
246
247void showNormalDisplay() {  //normal display
248  display.clearDisplay();
249  display.setTextSize(2);
250  display.setTextColor(SSD1306_WHITE);
251  display.setCursor(0,0);
252  display.println("Z-MIDI 6dp");
253  printAt(1,4,false,"Press  knob for setup");
254  printAt(1,6,true,"P T CH RAW VAL NT/CC");
255  display.display();  
256}
257
258void loadDefaults(byte PortNr, byte PortType) {
259  byte a=0;
260  byte b=0;
261  a=PortNr;
262  switch (PortType) {
263    case 1:
264      for  (b=0;b<NUM_VALUES;b++) {
265        menu_memory[a][b]=menu_L2_Value_piezo_def[b];
266      }
267    break;
268    case 2:
269      for (b=0;b<NUM_VALUES;b++) {
270        menu_memory[a][b]=menu_L2_Value_switch_def[b];
271      }
272    break;
273    case 3:
274      for (b=0;b<NUM_VALUES;b++) {
275        menu_memory[a][b]=menu_L2_Value_trimmer_def[b];
276      }
277    break;
278  }//switch(a)
279}//loadDefaults()
280
281void updateMemory()  {
282  int mAdr=0;
283  byte a=0;
284  byte b=0;
285  EEPROM.update(0,mId1);
286  EEPROM.update(1,mId2);
287  for (a=0;a<NUM_INPUTS;a++) {  // update EEPROM 54  bytes (addr=2to55)
288    for (b=0;b<NUM_VALUES;b++) {
289      mAdr=(2+(a*9))+b;
290      EEPROM.update(mAdr,menu_memory[a][b]);
291    }
292  }
293}
294
295void displayChoices()  {  // live display during navigating inside menu
296  switch (menuLevel) {
297    case  0:
298      if (knob==0) {
299        printAt(9,2,true,"exit");
300      } else  {
301        sprintf(atext,"%-4d",knob);
302        printAt(9,2,true,atext);
303      }
304    break;
305    case 1:
306      if (menu_L0_Input==0) {
307        printAt(9,2,false,"exit");
308      } else {
309        sprintf(atext,"%-4d",menu_L0_Input);
310        printAt(9,2,false,atext);
311      }
312      if (menu_memory[menu_L0_Input-1][1-1]==1) {  // ------------- 1=drum
313        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
314        printAt(20,2,false,atext);
315        printAt(7,4,false,"-");
316        sprintf(atext,"%-2d ",menu_memory[menu_L0_Input-1][6-1]);
317        printAt(17,4,false,atext);
318        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
319        printAt(7,5,false,atext);
320        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
321        printAt(17,5,false,atext);
322        printAt(7,6,false,"---");
323        APitch  = menu_memory[menu_L0_Input-1][4-1];
324        AOctave = ((int(APitch / 12)) -  2);
325        ANote = (APitch-((AOctave+2)*12) + 1);
326        s_substring(apark,  sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
327        sprintf(atext,"%s/%+1d",apark, AOctave);
328        printAt(17,6,false,atext);
329        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][5-1]);
330        printAt(7,7,false,atext);
331        printAt(17,7,false,"--");
332      } else {   // ----------------------------------------------  2=switch 3=trimmer
333        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
334        printAt(20,2,false,atext);
335        if (menu_memory[menu_L0_Input-1][2-1]==0)  {  // reverse
336          printAt(7,4,false,"N");
337        } else {
338          printAt(7,4,false,"Y");
339        }
340        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][6-1]);
341        printAt(17,4,false,atext);
342        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
343        printAt(7,5,false,atext);
344        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
345        printAt(17,5,false,atext);
346        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][9-1]);
347        printAt(7,6,false,atext);
348        printAt(17,6,false,"--/--");
349        printAt(7,7,false,"--");
350        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][8-1]);
351        printAt(17,7,false,atext);
352      }
353      printAt(8,2,false," ");  // clear pointers ">"
354      printAt(19,2,false," ");
355      printAt(6,4,false,"  ");
356      printAt(6,5,false," ");
357      printAt(16,6,false," ");
358      printAt(6,7,false," ");
359      printAt(16,4,false," ");
360      printAt(16,5,false,"  ");
361      printAt(16,7,false," ");
362      printAt(6,6,false," ");
363      switch(knob) {           // new pointer ">"
364        case 0:
365          printAt(8,2,false,">");
366        break;
367        case 1:
368          printAt(19,2,false,">");
369        break;
370        case 2:
371          printAt(6,4,false,">");
372        break;
373        case  3:
374          printAt(6,5,false,">");
375        break;
376        case 4:
377          printAt(16,6,false,">");
378        break;
379        case 5:
380          printAt(6,7,false,">");
381        break;
382        case 6:
383          printAt(16,4,false,">");
384        break;
385        case 7:
386          printAt(16,5,false,">");
387        break;
388        case  8:
389          printAt(16,7,false,">");
390        break;
391        case 9:
392          printAt(6,6,false,">");
393        break;
394      }//switch(knob)
395    break;
396    case 2:
397      switch(menu_L1_Voice) {  // print new voice's  value
398        case 0:
399        break;
400        case 1:
401          sprintf(atext,"%d",knob);
402          printAt(20,2,true,atext);
403        break;
404        case 2:
405          if  (knob==0) {  // reverse
406            printAt(7,4,true,"N");
407          } else  {
408            printAt(7,4,true,"Y");
409          }
410        break;
411        case  3:
412          sprintf(atext,"%-2d",knob);
413          printAt(7,5,true,atext);
414        break;
415        case 4:
416          APitch = knob;
417          AOctave  = ((int(APitch / 12)) - 2);
418          ANote = (APitch-((AOctave+2)*12) + 1);
419          s_substring(apark, sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1)  * 3, ((ANote-1) * 3)+1);
420          sprintf(atext,"%s/%+1d",apark, AOctave);
421          printAt(17,6,true,atext);
422        break;
423        case 5:
424          sprintf(atext,"%-2d",knob);
425          printAt(7,7,true,atext);
426        break;
427        case 6:
428          sprintf(atext,"%-2d",knob);
429          printAt(17,4,true,atext);
430        break;
431        case 7:
432          sprintf(atext,"%-3d",knob);
433          printAt(17,5,true,atext);
434        break;
435        case 8:
436          sprintf(atext,"%-2d",knob);
437          printAt(17,7,true,atext);
438        break;
439        case 9:
440          sprintf(atext,"%-3d",knob);
441          printAt(7,6,true,atext);
442        break;
443      }//switch(menu_L1_Voice)
444    break;
445  }//switch(menuLevel)
446}
447
448void updateEncoder() {  // ----------------------------------  encoder menu
449  int MSB = digitalRead(encoderPin1); //MSB = most significant bit
450  int LSB = digitalRead(encoderPin2); //LSB = least significant bit
451  int encoded  = (MSB << 1) |LSB; //converting the 2 pin value to single number
452  int sum  =  (lastEncoded << 2) | encoded; //adding it to the previous encoded value
453  if(sum  == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
454  if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue  --;
455  lastEncoded = encoded; //store this value for next time 
456  if ((encoderValue  - encoderPrev) > 8) {  // ------------------ right turn, clockwise ++
457    knob  ++;
458    if (menuLevel==0) if (knob>NUM_INPUTS) knob=0;
459    if (menuLevel==1)  if (knob>9) knob=0;
460    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=3;  // jump n.2 if drum
461    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=0;  // jump n.8 if drum
462    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=0;  // jump n.9 if drum
463    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2  || menu_memory[menu_L0_Input-1][1-1]==3) knob=6;  // jump n.4 if pedal
464    if  (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)  knob=6;  // jump n.5 if pedal
465    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  if (knob > menu_L2_Value_piezo_max[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_min[menu_L1_Voice-1];
466    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob > menu_L2_Value_switch_max[menu_L1_Voice-1])  knob=menu_L2_Value_switch_min[menu_L1_Voice-1];
467    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)  if (knob > menu_L2_Value_trimmer_max[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_min[menu_L1_Voice-1];
468    if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);  // load defaults if changing PortType 
469    encoderPrev=encoderValue;
470    displayChoices();
471    display.display();
472    if (IS_DEBUG) Serial.println(knob);
473  }
474  if  ((encoderValue - encoderPrev) < -8) {  // ------------------ left turn, anticlockwise  --
475    knob --;
476    if (menuLevel==0) if (knob<0) knob=NUM_INPUTS;
477    if  (menuLevel==1) if (knob<0) knob=9;
478    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=1;  // jump n.2 if drum
479    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=7;  // jump n.8 if drum
480    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=7;  // jump n.9 if drum
481    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2  || menu_memory[menu_L0_Input-1][1-1]==3) knob=3;  // jump n.4 if pedal
482    if  (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)  knob=3;  // jump n.5 if pedal
483    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  if (knob < menu_L2_Value_piezo_min[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_max[menu_L1_Voice-1];
484    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob < menu_L2_Value_switch_min[menu_L1_Voice-1])  knob=menu_L2_Value_switch_max[menu_L1_Voice-1];
485    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)  if (knob < menu_L2_Value_trimmer_min[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_max[menu_L1_Voice-1];
486    if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);  // load defaults if changing PortType 
487    encoderPrev=encoderValue;
488    displayChoices();
489    display.display();
490    if (IS_DEBUG) Serial.println(knob);
491  }
492  if  (((prevKNOBmillis+KNOBmenuInterval) < millis()) && (digitalRead(menuPin) == LOW))  {  // pressed knob
493    switch (menuLevel) {
494      case 0:
495        if (knob==0)  {  // exit from menu
496          showNormalDisplay();
497          updateMemory();
498          IsMenu=false;
499          if (IS_DEBUG) Serial.println("menu off");
500        } else {  //  chosen input nr
501          menuLevel=1;
502          menu_L0_Input=knob;
503          knob=0;
504          displayChoices();
505          display.display();
506          if (IS_DEBUG) Serial.print("chosen: ");
507          if (IS_DEBUG) Serial.print(menu_L0_Input);
508          if (IS_DEBUG) Serial.println(", menu level 1 (voice 0-9)");
509        }
510        break;
511      case 1:
512        if (knob==0) {  // back previous level  0
513          menuLevel=0;
514          knob=menu_L0_Input;
515          displayChoices();
516          display.display();
517          if (IS_DEBUG) Serial.println("back menu  level 0 (input nr 0-6)");
518        } else {  //  chosen voice
519          menuLevel=2;
520          menu_L1_Voice=knob;
521          knob=menu_memory[menu_L0_Input-1][menu_L1_Voice-1];  // propose value in memory
522          displayChoices();
523          display.display();
524          if (IS_DEBUG) Serial.print("chosen: ");
525          if (IS_DEBUG) Serial.print(menu_L1_Voice);
526          if (IS_DEBUG) Serial.println(", menu level 2 (VALUE 0-127)");
527        }
528        break;
529      case 2:
530        menuLevel=1;  //   save value & back  previous level 1
531        menu_L2_Value=knob;
532        menu_memory[menu_L0_Input-1][menu_L1_Voice-1]=menu_L2_Value;
533        knob=menu_L1_Voice;
534        displayChoices();
535        display.display();
536        if (IS_DEBUG) Serial.print("chosen: ");
537        if (IS_DEBUG) Serial.print(menu_L2_Value);
538        if (IS_DEBUG) Serial.println(", save VALUE & back level 1 (voice 0-9)");
539        break;
540    }  // switch menuLevel
541    prevKNOBmillis=millis();
542  }  // if millis() 
543}  // updateEncoder()
544
545
546void printAt(const byte  col, const byte row, const bool blackonwhite, const char thetext[31]) {  // -------  printAt
547  // display: 21 col. x 8 row [setcursor(x,y)] x=(col-1)*6 y=(row-1)*8
548  // x=0,6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,102,108,114,120 
549  //  y=0,8,16,24,32,40,48,56
550  display.setTextSize(1);
551  if (blackonwhite==true)  {
552    display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // b/w
553  } else  {
554    display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); // normal
555  }
556  display.setCursor((col-1)*6,(row-1)*8);
557  display.print(thetext);
558}  //  printAt()
559
560
561void readSwitch(byte btnr) {  // ----------------------------------  switch
562  int val = 0;
563  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
564  int raw = val;
565  if (val > menu_memory[btnr][6]) {  //6=maxValue
566    val  = menu_memory[btnr][6];
567  }
568  if (val < menu_memory[btnr][5]) {  //5=minValue
569    val = menu_memory[btnr][5];
570  }
571  controlvalue = map(val, menu_memory[btnr][5],  menu_memory[btnr][6], 0, 127);  // expand value  5=minValue 6=maxValue
572  if (controlvalue  < (128/2)) {  // .. off
573    if (menu_memory[btnr][1]==0) {  //1=reverse
574      controlvalue=0;
575    } else {
576      controlvalue=127;
577    }
578  } else {  // .......................  on
579    if (menu_memory[btnr][1]==0) {  //1=reverse
580      controlvalue=127;
581    } else {
582      controlvalue=0;
583    }
584  }
585  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])  || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
586    controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);  //8=controlNr 2=channel
587
588    if (IS_DEBUG) Serial.print(btnr+1);
589    if  (IS_DEBUG) Serial.print(" ");
590    if (IS_DEBUG) Serial.print(menu_memory[btnr][2]);  //2=channel
591    if (IS_DEBUG) Serial.print(" ");
592    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);  //8=controlNr
593    if (IS_DEBUG) Serial.print(" ");
594    if (IS_DEBUG) Serial.print(raw);
595    if (IS_DEBUG) Serial.print(" ");
596    if (IS_DEBUG) Serial.println(controlvalue);
597
598    sprintf(atext,"%d ",btnr+1);  // live monitor
599    printAt(1,7,false,atext);
600    printAt(3,7,false,"S");
601    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
602    printAt(5,7,false,atext);
603    sprintf(atext,"%d   ",raw);
604    printAt(8,7,false,atext);
605    sprintf(atext,"%d   ",controlvalue);
606    printAt(12,7,false,atext);
607    sprintf(atext,"%d     ",menu_memory[btnr][8]);  //8=controlNr
608    printAt(16,7,false,atext);
609    display.display();
610
611    prevValue[btnr]=controlvalue;
612    analogWrite(leds[btnr], (controlvalue*2));
613  }
614}  // readSwitch()
615
616void readTrimmer(byte btnr) {  // ----------------------------------  trimmer
617  int val = 0;
618  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
619  int raw = val;
620  if (val > menu_memory[btnr][6]) {  //6=maxValue
621    val  = menu_memory[btnr][6];
622  }
623  if (val < menu_memory[btnr][5]) {  //5=minValue
624    val = menu_memory[btnr][5];
625  }
626  if (menu_memory[btnr][1]==0) { controlvalue  = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 0, 127);}  // expand value  if reverse=no 5=minValue 6=maxValue
627  if (menu_memory[btnr][1]==1) { controlvalue  = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 127, 0);}  // expand value  if reverse=yes 5=minValue 6=maxValue
628  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])  || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
629    controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);  //8=controlNr 2=channel
630
631    if (IS_DEBUG) Serial.print(btnr+1);
632    if  (IS_DEBUG) Serial.print(" ");
633    if (IS_DEBUG) Serial.print((menu_memory[btnr][2]));  //2=channel
634    if (IS_DEBUG) Serial.print(" ");
635    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);  //8=controlNr
636    if (IS_DEBUG) Serial.print(" ");
637    if (IS_DEBUG) Serial.print(raw);
638    if (IS_DEBUG) Serial.print(" ");
639    if (IS_DEBUG) Serial.println(controlvalue);
640
641    sprintf(atext,"%d ",btnr+1);  // live monitor
642    printAt(1,7,false,atext);
643    printAt(3,7,false,"T");
644    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
645    printAt(5,7,false,atext);
646    sprintf(atext,"%d   ",raw);
647    printAt(8,7,false,atext);
648    sprintf(atext,"%d   ",controlvalue);
649    printAt(12,7,false,atext);
650    sprintf(atext,"%d     ",menu_memory[btnr][8]);  //8=controlNr
651    printAt(16,7,false,atext);
652    display.display();
653
654    prevValue[btnr]=controlvalue;
655    analogWrite(leds[btnr], (controlvalue*2));
656  }
657}  // readTrimmer()
658
659void readDrum(byte btnr) {  // --------------------------------------  drum
660  int val=0;
661  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
662  int raw = val;
663  while (val >= menu_memory[btnr][5]) {  //5=minValue as threshold
664    drum_isPressed = true;
665    if (val >= drum_velocity) {  // take the peak  of wave
666      drum_velocity=val;
667    }
668    val = map(analogRead(inputs[btnr]),  0, 1023, 0, 127);
669  }//while
670  if (drum_isPressed == true) {
671    if (drum_velocity  > menu_memory[btnr][6]) {  //6=maxValue
672      drum_velocity = menu_memory[btnr][6];
673    }
674    velocity = map(drum_velocity, menu_memory[btnr][5], menu_memory[btnr][6],  1, 127);  // expand velocity 5=minValue 6=maxValue
675    playNoteOn((menu_memory[btnr][2]-1),  menu_memory[btnr][3], velocity);  //3=pitchNr 2=channel
676    
677    if (IS_DEBUG)  Serial.print(btnr+1);
678    if (IS_DEBUG) Serial.print(" ");
679    if (IS_DEBUG)  Serial.print((menu_memory[btnr][2]));  //2=channel
680    if (IS_DEBUG) Serial.print("  ");
681    if (IS_DEBUG) Serial.print(menu_memory[btnr][3]);  //3=pitchNr
682    if  (IS_DEBUG) Serial.print(" ");
683    if (IS_DEBUG) Serial.print(raw);
684    if  (IS_DEBUG) Serial.print(" ");
685    if (IS_DEBUG) Serial.print(velocity);
686    if (IS_DEBUG) Serial.print(" --> ");
687
688    sprintf(atext,"%d ",btnr+1);  // live monitor
689    printAt(1,7,false,atext);
690    printAt(3,7,false,"P");
691    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
692    printAt(5,7,false,atext);
693    sprintf(atext,"%d   ",raw);
694    printAt(8,7,false,atext);
695    sprintf(atext,"%d   ",velocity);
696    printAt(12,7,false,atext);
697    sprintf(atext,"%d     ",menu_memory[btnr][3]);  //3=pitchNr
698    APitch = menu_memory[btnr][3];
699    AOctave = ((int(APitch  / 12)) - 2);
700    ANote = (APitch-((AOctave+2)*12) + 1);
701    s_substring(apark,  sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
702    sprintf(atext,"%s/%d ",apark,AOctave);
703    printAt(16,7,false,atext);
704    display.display();
705
706    if (IS_DEBUG) Serial.print(APitch);
707    if  (IS_DEBUG) Serial.print(" ");
708    if (IS_DEBUG) Serial.print(AOctave);
709    if (IS_DEBUG) Serial.print(" ");
710    if (IS_DEBUG) Serial.print(ANote);
711    if (IS_DEBUG) Serial.print(" ");
712    if (IS_DEBUG) Serial.println(atext);
713    
714    prevValue[btnr]=velocity;
715    drum_velocity=0;
716    drum_isPressed  = false;
717    analogWrite(leds[btnr], (velocity*2));
718    delay(menu_memory[btnr][4]);  //4=timeinterval
719    analogWrite(leds[btnr], off);
720  }  // if(drum1_isPressed)
721}  // readDrum()
722
723
724// First parameter is the event type (0x0B = control  change) 4 bits
725// Second parameter is the event type, combined with the channel,  above 4 bits + channel 4 bits
726// Third parameter is the control number (0-119).
727//  Fourth parameter is the control value (0-127).
728// --------------------------------------------------------------
729void  controlChange(byte channel, byte control, byte value) {
730  midiEventPacket_t midiCc  = {0x0B, byte (0xB0 | channel), control, value};
731  MidiUSB.sendMIDI(midiCc);  // to USB MIDI
732  MidiUSB.flush();
733  Serial1.write(0xB0 | channel);  // to  serial1 MIDI
734  Serial1.write(control);
735  Serial1.write(value);
736}
737
738//  First parameter is the event type (0x09 = note on, 0x08 = note off) 4 bits
739//  Second parameter is note-on/note-off, combined with the channel, above 4 bits +  channel 4 bits
740// Channel between 0-15. Typically reported to the user as 1-16
741//  Third parameter is the note number, the pitch, (48 = middle C).
742// Fourth parameter  is the velocity (0 = none, 64 = normal, 127 = louder/faster).
743// --------------------------------------------------------------
744void  playNoteOn(byte channel, byte pitch, byte velocity) {
745  midiEventPacket_t noteOn  = {0x09, byte (0x90 | channel), pitch, velocity};
746  MidiUSB.sendMIDI(noteOn);  // to USB MIDI
747  MidiUSB.flush();
748  Serial1.write(0x90 | channel);  // to  serial1 MIDI
749  Serial1.write(pitch);
750  Serial1.write(velocity);
751}
752void  playNoteOff(byte channel, byte pitch, byte velocity) {
753  midiEventPacket_t noteOff  = {0x08, byte (0x80 | channel), pitch, velocity};
754  MidiUSB.sendMIDI(noteOff);  // to USB MIDI
755  MidiUSB.flush();
756  Serial1.write(0x80 | channel);  // to  serial1 MIDI
757  Serial1.write(pitch);
758  Serial1.write(velocity);
759}
760
761//-------------------------------------------------------------------------  SUBSTRING
762bool s_substring(char *dest_string, const int dest_sizeof, const char  *source_string, 
763 const int source_sizeof, const int source_from, const int source_to)  {  // copies source(from, to) to dest
764  if ((source_from < 0) || (source_to <  source_from) || ((source_to - source_from + 1) > (dest_sizeof - 1)) 
765    || (source_to  >= (source_sizeof-1)) || ((source_to - source_from + 1) > (strlen(source_string))))  {
766    dest_string[0]=0;  // NUL
767    return true;  // err 1
768  } else {
769    int _Count=0;
770    for (int i=source_from;i<(source_to+1);i++) {
771      dest_string[_Count]=source_string[i];
772      _Count++;
773    }
774    dest_string[_Count]=0;  // ends with NUL
775    return  false;  // ok 0
776  }
777}  // end s_substring()

/*
 * ard-mididrum.ino
 * 
 * MIDI interface for 6 inputs as  drum pads 'mono' (variable/analog from piezo sensor) with velocity value
 *                and  for pedals 'stereo' ("expression" type with potentiometer inside)
 *                and  for pedals 'mono' ("sustain" type with a switch inside NA or NC)
 *                
  * it uses Arduino Micro, USB port as MIDI-OUT device, OLED 128x64 display (setup  and monitor),
 * rotary encoder + button for setup menu and options, 6 dimmable  leds to monitor 6 inputs activity, 
 * MIDI-OUT serial port; parameters are memorized  in the MPU EEPROM;
 * 
 * 
 * by Marco Zonca 8-12/2020
 * 
*/

/*table
  * 
 * octave note pitchNr
 * -------------------
 *  -2    C    0
 *  -2    C#   1
 *  -2    D    2
 *  -2    D#   3
 *  -2    E    4
 *  -2    F    5
 *  -2    F#   6    
 *  -2    G    7
 *  -2    G#   8
  *  -2    A    9
 *  -2    A#   10
 *  -2    B    11
 *  
 *  ...the  same for the other octaves...
 *  
 * octave note pitchNr
 * -------------------
  *  -1   (C-B)   12-23
 *   0   (C-B)   24-35
 *   1   (C-B)   36-47
 *   2   (C-B)   48-59
 *   3   (C-B)   60-71
 *   4   (C-B)   72-83
 *   5   (C-B)   84-95
 *   6   (C-B)   96-107
 *   7   (C-B)   108-119
 *   8   (C-G)   120-127
 *   
 *   PitchNr [0 to 127]
 *   Octave = ((int(PitchNr  / 12)) - 2)     [-2 to 8]
 *   Note-Number = (PitchNr-((Octave+2)*12) + 1) [1  to 12]
 *   
 *   ----------------------
 *   for pitchNr the maximum is  127
 *   for controlNr the maximum is 119
 *   
*/

#include "MIDIUSB.h"
#include  <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include  <EEPROM.h>

#define NUM_INPUTS  6
#define NUM_VALUES  9
#define IS_DEBUG  false

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

//  drums or pedals
const uint8_t input1 = 18;  // A0
const uint8_t input2 = 19;  // A1
const uint8_t input3 = 20;  // A2
const uint8_t input4 = 21;  // A3
const  uint8_t input5 = 22;  // A4
const uint8_t input6 = 23;  // A5

// leds
const  int led1Pin = 13;
const int led2Pin = 11;
const int led3Pin = 10;
const  int led4Pin = 9;
const int led5Pin = 6;
const int led6Pin = 5;
const byte  on = 255;
const byte off = 0;

const uint8_t inputs[NUM_INPUTS] = {input1,  input2, input3, input4, input5, input6};
const uint8_t leds[NUM_INPUTS] = {led1Pin,  led2Pin, led3Pin, led4Pin, led5Pin, led6Pin};
uint8_t prevValue[NUM_INPUTS] =  {0, 0, 0, 0, 0, 0};

byte APitch = 48;
int AOctave = (int(APitch/12)-2);
byte  ANote = (APitch-((AOctave+2)*12) + 1);
char tableNotes[41] = "C  C# D  D# E  F  F# G  G# A  A# B  ";
char atext[31]="";
char apark[31]="";

uint8_t  drum_velocity = 0;
uint8_t velocity = 0;
uint8_t controlvalue = 0;
bool  drum_isPressed = false;

uint8_t bType[NUM_INPUTS] = {1, 1, 1, 1, 2, 3};  //  1=piezo drum 2=switch pedal 3=trimmer pedal (default setting)

int KNOBinterval  = 4000; // m/sec to enter Menu
int KNOBmenuInterval = 1000; // m/sec to navigate  Menu

// rotary encoder
int menuPin = 4;
int encoderPin1 = 7;
int  encoderPin2 = 12;
volatile int lastEncoded = 0;
volatile long encoderValue  = 0;
volatile long encoderPrev = 0;
volatile boolean IsMenu = false;
volatile  long lastencoderValue = 0;
volatile int lastMSB = 0;
volatile int lastLSB  = 0;
volatile int knob = 0;
volatile byte preknob = 1;
unsigned long prevKNOBmillis  = 0;
byte menuLevel=0;  // 0-2
byte menu_L0_Input=0;  // 0-6 0=exit
byte  menu_L1_Voice=0;  // 0-9 0=back
byte menu_L2_Value=0;  // 0-127
byte menu_memory[NUM_INPUTS][NUM_VALUES];


/*  Voices 0:Type          1=piezo/drum 2=switch/pedal 3=trimmer/pedal
 *         1:Reverse       0=no 1=yes (only pedals)
 *         2:Channel       1-16
 *         3:PitchNr       0-127 (only drums)
 *         4:Len           5-95 m/sec (only drums)
  *         5:Min           0-63
 *         6:Max           64-127
 *         7:AntiBouncing  0-63 (only pedals)
 *         8:ControlNr     0-119 (only pedals)
 *         
  */

const byte menu_L2_Value_piezo_min[NUM_VALUES]=  {  1, 255,  1,   0,   5,  0,  64, 255, 255};  // 255=not used
const byte menu_L2_Value_piezo_max[NUM_VALUES]=  {  3, 255, 16, 127,  95, 63, 127, 255, 255};
const byte menu_L2_Value_piezo_def[NUM_VALUES]=  {  1, 255,  1,  48,  50, 30, 100, 255, 255};
const byte menu_L2_Value_switch_min[NUM_VALUES]=  {  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
const byte menu_L2_Value_switch_max[NUM_VALUES]=  {  3,   1, 16, 255, 255, 63, 127,  63, 119}; 
const byte menu_L2_Value_switch_def[NUM_VALUES]=  {  2,   1,  1, 255, 255,  0,  70,  60, 102}; 
const byte menu_L2_Value_trimmer_min[NUM_VALUES]={  1,   0,  1, 255, 255,  0,  64,   0,   0}; 
const byte menu_L2_Value_trimmer_max[NUM_VALUES]={  3,   1, 16, 255, 255, 63, 127,  63, 119};
const byte menu_L2_Value_trimmer_def[NUM_VALUES]={  3,   0,  1, 255, 255,  0,  90,   2, 103};
const byte mId1=0xF1;
const byte  mId2=0xF2;

void setup() {
  int mAdr=0;
  byte a=0;
  byte b=0;
  if (IS_DEBUG) Serial.begin(38400);
  Serial1.begin(31250);  // must be 31250  for MIDI standard
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Display Address  0x3C for 128x64 pixels
  pinMode(encoderPin1, INPUT_PULLUP);
  pinMode(encoderPin2,  INPUT_PULLUP);
  pinMode(menuPin, INPUT_PULLUP);
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin,  OUTPUT);
  pinMode(led5Pin, OUTPUT);
  pinMode(led6Pin, OUTPUT);

  mAdr=0;  // read EEPROM first 2 ID bytes and load, if necessary, all default parameters
  if (EEPROM.read(mAdr) != mId1 || EEPROM.read(mAdr+1) != mId2)  {
    for (a=0;a<NUM_INPUTS;a++)  {
      loadDefaults(a, bType[a]);
    }//for a
    updateMemory();
  } else {
    for (a=0;a<NUM_INPUTS;a++) {  // read EEPROM 54 bytes (addr=2to55)
      for (b=0;b<NUM_VALUES;b++) {
        mAdr=(2+(a*9))+b;
        menu_memory[a][b]=EEPROM.read(mAdr);
      }
    }
  }//if EEPROM.read()
    
  for (byte i=0;i<NUM_INPUTS;i++)  {  // pullup for switches
    switch (menu_memory[i][0]) {  //0=type
      case  1:  // drum
      break;
      case 2:  // switch
        pinMode(inputs[i],  INPUT_PULLUP);
      break;
      case 3:  // trimmer
      break;
    }//switch
  }//for i

  for (int i=1;i<=NUM_INPUTS;i++) {  // leds  show
    if (i>1) { analogWrite(leds[i-2], off); }
    analogWrite(leds[i-1],  on);
    delay(200);
  }
  analogWrite(leds[5], off); 

  showNormalDisplay();
}//setup()


void  loop() {
  if (IsMenu==false) {
    for (byte i=0;i<NUM_INPUTS;i++) {  //  ----------------- work on inputs
      switch (menu_memory[i][0]) {  //0=type
        case 1:  // drum
          readDrum(i); 
          break;
        case  2:  // switch
          readSwitch(i);
          break;
        case 3:  // trimmer
          readTrimmer(i);
          break;
      }  //switch
    }  // for i
    if ((prevKNOBmillis+KNOBinterval) < millis()) {  // ----  check menu
      if (digitalRead(menuPin) == LOW) {
        IsMenu=true;
        menuLevel=0;
        menu_L0_Input=0;
        if (IS_DEBUG) Serial.println("menu  level 0 (input nr 0-6)");
        display.clearDisplay();
        printAt(2,2,false,"SETUP:      type:");
        printAt(2,4,false,"rev:     min :");
        printAt(2,5,false,"ch  :     max :");
        printAt(2,6,false,"ctr:     note:");
        printAt(2,7,false,"len:     abnc:");
        displayChoices();
        display.display();
      }
      prevKNOBmillis=millis();
    }
   } else {
    updateEncoder(); 
  } // if IsMenu()
}  // loop()

void showNormalDisplay() {  //normal display
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.println("Z-MIDI 6dp");
  printAt(1,4,false,"Press  knob for setup");
  printAt(1,6,true,"P T CH RAW VAL NT/CC");
  display.display();  
}

void loadDefaults(byte PortNr, byte PortType) {
  byte a=0;
  byte b=0;
  a=PortNr;
  switch (PortType) {
    case 1:
      for  (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_piezo_def[b];
      }
    break;
    case 2:
      for (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_switch_def[b];
      }
    break;
    case 3:
      for (b=0;b<NUM_VALUES;b++) {
        menu_memory[a][b]=menu_L2_Value_trimmer_def[b];
      }
    break;
  }//switch(a)
}//loadDefaults()

void updateMemory()  {
  int mAdr=0;
  byte a=0;
  byte b=0;
  EEPROM.update(0,mId1);
  EEPROM.update(1,mId2);
  for (a=0;a<NUM_INPUTS;a++) {  // update EEPROM 54  bytes (addr=2to55)
    for (b=0;b<NUM_VALUES;b++) {
      mAdr=(2+(a*9))+b;
      EEPROM.update(mAdr,menu_memory[a][b]);
    }
  }
}

void displayChoices()  {  // live display during navigating inside menu
  switch (menuLevel) {
    case  0:
      if (knob==0) {
        printAt(9,2,true,"exit");
      } else  {
        sprintf(atext,"%-4d",knob);
        printAt(9,2,true,atext);
      }
    break;
    case 1:
      if (menu_L0_Input==0) {
        printAt(9,2,false,"exit");
      } else {
        sprintf(atext,"%-4d",menu_L0_Input);
        printAt(9,2,false,atext);
      }
      if (menu_memory[menu_L0_Input-1][1-1]==1) {  // ------------- 1=drum
        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
        printAt(20,2,false,atext);
        printAt(7,4,false,"-");
        sprintf(atext,"%-2d ",menu_memory[menu_L0_Input-1][6-1]);
        printAt(17,4,false,atext);
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
        printAt(7,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
        printAt(17,5,false,atext);
        printAt(7,6,false,"---");
        APitch  = menu_memory[menu_L0_Input-1][4-1];
        AOctave = ((int(APitch / 12)) -  2);
        ANote = (APitch-((AOctave+2)*12) + 1);
        s_substring(apark,  sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
        sprintf(atext,"%s/%+1d",apark, AOctave);
        printAt(17,6,false,atext);
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][5-1]);
        printAt(7,7,false,atext);
        printAt(17,7,false,"--");
      } else {   // ----------------------------------------------  2=switch 3=trimmer
        sprintf(atext,"%d",menu_memory[menu_L0_Input-1][1-1]);
        printAt(20,2,false,atext);
        if (menu_memory[menu_L0_Input-1][2-1]==0)  {  // reverse
          printAt(7,4,false,"N");
        } else {
          printAt(7,4,false,"Y");
        }
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][6-1]);
        printAt(17,4,false,atext);
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][3-1]);
        printAt(7,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][7-1]);
        printAt(17,5,false,atext);
        sprintf(atext,"%-3d",menu_memory[menu_L0_Input-1][9-1]);
        printAt(7,6,false,atext);
        printAt(17,6,false,"--/--");
        printAt(7,7,false,"--");
        sprintf(atext,"%-2d",menu_memory[menu_L0_Input-1][8-1]);
        printAt(17,7,false,atext);
      }
      printAt(8,2,false," ");  // clear pointers ">"
      printAt(19,2,false," ");
      printAt(6,4,false,"  ");
      printAt(6,5,false," ");
      printAt(16,6,false," ");
      printAt(6,7,false," ");
      printAt(16,4,false," ");
      printAt(16,5,false,"  ");
      printAt(16,7,false," ");
      printAt(6,6,false," ");
      switch(knob) {           // new pointer ">"
        case 0:
          printAt(8,2,false,">");
        break;
        case 1:
          printAt(19,2,false,">");
        break;
        case 2:
          printAt(6,4,false,">");
        break;
        case  3:
          printAt(6,5,false,">");
        break;
        case 4:
          printAt(16,6,false,">");
        break;
        case 5:
          printAt(6,7,false,">");
        break;
        case 6:
          printAt(16,4,false,">");
        break;
        case 7:
          printAt(16,5,false,">");
        break;
        case  8:
          printAt(16,7,false,">");
        break;
        case 9:
          printAt(6,6,false,">");
        break;
      }//switch(knob)
    break;
    case 2:
      switch(menu_L1_Voice) {  // print new voice's  value
        case 0:
        break;
        case 1:
          sprintf(atext,"%d",knob);
          printAt(20,2,true,atext);
        break;
        case 2:
          if  (knob==0) {  // reverse
            printAt(7,4,true,"N");
          } else  {
            printAt(7,4,true,"Y");
          }
        break;
        case  3:
          sprintf(atext,"%-2d",knob);
          printAt(7,5,true,atext);
        break;
        case 4:
          APitch = knob;
          AOctave  = ((int(APitch / 12)) - 2);
          ANote = (APitch-((AOctave+2)*12) + 1);
          s_substring(apark, sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1)  * 3, ((ANote-1) * 3)+1);
          sprintf(atext,"%s/%+1d",apark, AOctave);
          printAt(17,6,true,atext);
        break;
        case 5:
          sprintf(atext,"%-2d",knob);
          printAt(7,7,true,atext);
        break;
        case 6:
          sprintf(atext,"%-2d",knob);
          printAt(17,4,true,atext);
        break;
        case 7:
          sprintf(atext,"%-3d",knob);
          printAt(17,5,true,atext);
        break;
        case 8:
          sprintf(atext,"%-2d",knob);
          printAt(17,7,true,atext);
        break;
        case 9:
          sprintf(atext,"%-3d",knob);
          printAt(7,6,true,atext);
        break;
      }//switch(menu_L1_Voice)
    break;
  }//switch(menuLevel)
}

void updateEncoder() {  // ----------------------------------  encoder menu
  int MSB = digitalRead(encoderPin1); //MSB = most significant bit
  int LSB = digitalRead(encoderPin2); //LSB = least significant bit
  int encoded  = (MSB << 1) |LSB; //converting the 2 pin value to single number
  int sum  =  (lastEncoded << 2) | encoded; //adding it to the previous encoded value
  if(sum  == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) encoderValue ++;
  if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) encoderValue  --;
  lastEncoded = encoded; //store this value for next time 
  if ((encoderValue  - encoderPrev) > 8) {  // ------------------ right turn, clockwise ++
    knob  ++;
    if (menuLevel==0) if (knob>NUM_INPUTS) knob=0;
    if (menuLevel==1)  if (knob>9) knob=0;
    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=3;  // jump n.2 if drum
    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=0;  // jump n.8 if drum
    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=0;  // jump n.9 if drum
    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2  || menu_memory[menu_L0_Input-1][1-1]==3) knob=6;  // jump n.4 if pedal
    if  (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)  knob=6;  // jump n.5 if pedal
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  if (knob > menu_L2_Value_piezo_max[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_min[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob > menu_L2_Value_switch_max[menu_L1_Voice-1])  knob=menu_L2_Value_switch_min[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)  if (knob > menu_L2_Value_trimmer_max[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_min[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);  // load defaults if changing PortType 
    encoderPrev=encoderValue;
    displayChoices();
    display.display();
    if (IS_DEBUG) Serial.println(knob);
  }
  if  ((encoderValue - encoderPrev) < -8) {  // ------------------ left turn, anticlockwise  --
    knob --;
    if (menuLevel==0) if (knob<0) knob=NUM_INPUTS;
    if  (menuLevel==1) if (knob<0) knob=9;
    if (menuLevel==1) if (knob==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=1;  // jump n.2 if drum
    if (menuLevel==1) if (knob==8) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=7;  // jump n.8 if drum
    if (menuLevel==1) if (knob==9) if (menu_memory[menu_L0_Input-1][1-1]==1)  knob=7;  // jump n.9 if drum
    if (menuLevel==1) if (knob==4) if (menu_memory[menu_L0_Input-1][1-1]==2  || menu_memory[menu_L0_Input-1][1-1]==3) knob=3;  // jump n.4 if pedal
    if  (menuLevel==1) if (knob==5) if (menu_memory[menu_L0_Input-1][1-1]==2 || menu_memory[menu_L0_Input-1][1-1]==3)  knob=3;  // jump n.5 if pedal
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==1)  if (knob < menu_L2_Value_piezo_min[menu_L1_Voice-1]) knob=menu_L2_Value_piezo_max[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==2) if (knob < menu_L2_Value_switch_min[menu_L1_Voice-1])  knob=menu_L2_Value_switch_max[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_memory[menu_L0_Input-1][1-1]==3)  if (knob < menu_L2_Value_trimmer_min[menu_L1_Voice-1]) knob=menu_L2_Value_trimmer_max[menu_L1_Voice-1];
    if (menuLevel==2) if (menu_L1_Voice==1) loadDefaults((menu_L0_Input-1),knob);  // load defaults if changing PortType 
    encoderPrev=encoderValue;
    displayChoices();
    display.display();
    if (IS_DEBUG) Serial.println(knob);
  }
  if  (((prevKNOBmillis+KNOBmenuInterval) < millis()) && (digitalRead(menuPin) == LOW))  {  // pressed knob
    switch (menuLevel) {
      case 0:
        if (knob==0)  {  // exit from menu
          showNormalDisplay();
          updateMemory();
          IsMenu=false;
          if (IS_DEBUG) Serial.println("menu off");
        } else {  //  chosen input nr
          menuLevel=1;
          menu_L0_Input=knob;
          knob=0;
          displayChoices();
          display.display();
          if (IS_DEBUG) Serial.print("chosen: ");
          if (IS_DEBUG) Serial.print(menu_L0_Input);
          if (IS_DEBUG) Serial.println(", menu level 1 (voice 0-9)");
        }
        break;
      case 1:
        if (knob==0) {  // back previous level  0
          menuLevel=0;
          knob=menu_L0_Input;
          displayChoices();
          display.display();
          if (IS_DEBUG) Serial.println("back menu  level 0 (input nr 0-6)");
        } else {  //  chosen voice
          menuLevel=2;
          menu_L1_Voice=knob;
          knob=menu_memory[menu_L0_Input-1][menu_L1_Voice-1];  // propose value in memory
          displayChoices();
          display.display();
          if (IS_DEBUG) Serial.print("chosen: ");
          if (IS_DEBUG) Serial.print(menu_L1_Voice);
          if (IS_DEBUG) Serial.println(", menu level 2 (VALUE 0-127)");
        }
        break;
      case 2:
        menuLevel=1;  //   save value & back  previous level 1
        menu_L2_Value=knob;
        menu_memory[menu_L0_Input-1][menu_L1_Voice-1]=menu_L2_Value;
        knob=menu_L1_Voice;
        displayChoices();
        display.display();
        if (IS_DEBUG) Serial.print("chosen: ");
        if (IS_DEBUG) Serial.print(menu_L2_Value);
        if (IS_DEBUG) Serial.println(", save VALUE & back level 1 (voice 0-9)");
        break;
    }  // switch menuLevel
    prevKNOBmillis=millis();
  }  // if millis() 
}  // updateEncoder()


void printAt(const byte  col, const byte row, const bool blackonwhite, const char thetext[31]) {  // -------  printAt
  // display: 21 col. x 8 row [setcursor(x,y)] x=(col-1)*6 y=(row-1)*8
  // x=0,6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,102,108,114,120 
  //  y=0,8,16,24,32,40,48,56
  display.setTextSize(1);
  if (blackonwhite==true)  {
    display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // b/w
  } else  {
    display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); // normal
  }
  display.setCursor((col-1)*6,(row-1)*8);
  display.print(thetext);
}  //  printAt()


void readSwitch(byte btnr) {  // ----------------------------------  switch
  int val = 0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
  int raw = val;
  if (val > menu_memory[btnr][6]) {  //6=maxValue
    val  = menu_memory[btnr][6];
  }
  if (val < menu_memory[btnr][5]) {  //5=minValue
    val = menu_memory[btnr][5];
  }
  controlvalue = map(val, menu_memory[btnr][5],  menu_memory[btnr][6], 0, 127);  // expand value  5=minValue 6=maxValue
  if (controlvalue  < (128/2)) {  // .. off
    if (menu_memory[btnr][1]==0) {  //1=reverse
      controlvalue=0;
    } else {
      controlvalue=127;
    }
  } else {  // .......................  on
    if (menu_memory[btnr][1]==0) {  //1=reverse
      controlvalue=127;
    } else {
      controlvalue=0;
    }
  }
  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])  || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
    controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);  //8=controlNr 2=channel

    if (IS_DEBUG) Serial.print(btnr+1);
    if  (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][2]);  //2=channel
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);  //8=controlNr
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(controlvalue);

    sprintf(atext,"%d ",btnr+1);  // live monitor
    printAt(1,7,false,atext);
    printAt(3,7,false,"S");
    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
    printAt(5,7,false,atext);
    sprintf(atext,"%d   ",raw);
    printAt(8,7,false,atext);
    sprintf(atext,"%d   ",controlvalue);
    printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][8]);  //8=controlNr
    printAt(16,7,false,atext);
    display.display();

    prevValue[btnr]=controlvalue;
    analogWrite(leds[btnr], (controlvalue*2));
  }
}  // readSwitch()

void readTrimmer(byte btnr) {  // ----------------------------------  trimmer
  int val = 0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
  int raw = val;
  if (val > menu_memory[btnr][6]) {  //6=maxValue
    val  = menu_memory[btnr][6];
  }
  if (val < menu_memory[btnr][5]) {  //5=minValue
    val = menu_memory[btnr][5];
  }
  if (menu_memory[btnr][1]==0) { controlvalue  = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 0, 127);}  // expand value  if reverse=no 5=minValue 6=maxValue
  if (menu_memory[btnr][1]==1) { controlvalue  = map(val, menu_memory[btnr][5], menu_memory[btnr][6], 127, 0);}  // expand value  if reverse=yes 5=minValue 6=maxValue
  if (controlvalue <= (prevValue[btnr]-menu_memory[btnr][7])  || controlvalue >= (prevValue[btnr]+menu_memory[btnr][7])) {  //7=antibouncing
    controlChange((menu_memory[btnr][2]-1), menu_memory[btnr][8], controlvalue);  //8=controlNr 2=channel

    if (IS_DEBUG) Serial.print(btnr+1);
    if  (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print((menu_memory[btnr][2]));  //2=channel
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][8]);  //8=controlNr
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(controlvalue);

    sprintf(atext,"%d ",btnr+1);  // live monitor
    printAt(1,7,false,atext);
    printAt(3,7,false,"T");
    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
    printAt(5,7,false,atext);
    sprintf(atext,"%d   ",raw);
    printAt(8,7,false,atext);
    sprintf(atext,"%d   ",controlvalue);
    printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][8]);  //8=controlNr
    printAt(16,7,false,atext);
    display.display();

    prevValue[btnr]=controlvalue;
    analogWrite(leds[btnr], (controlvalue*2));
  }
}  // readTrimmer()

void readDrum(byte btnr) {  // --------------------------------------  drum
  int val=0;
  val = map(analogRead(inputs[btnr]), 0, 1023, 0, 127);
  int raw = val;
  while (val >= menu_memory[btnr][5]) {  //5=minValue as threshold
    drum_isPressed = true;
    if (val >= drum_velocity) {  // take the peak  of wave
      drum_velocity=val;
    }
    val = map(analogRead(inputs[btnr]),  0, 1023, 0, 127);
  }//while
  if (drum_isPressed == true) {
    if (drum_velocity  > menu_memory[btnr][6]) {  //6=maxValue
      drum_velocity = menu_memory[btnr][6];
    }
    velocity = map(drum_velocity, menu_memory[btnr][5], menu_memory[btnr][6],  1, 127);  // expand velocity 5=minValue 6=maxValue
    playNoteOn((menu_memory[btnr][2]-1),  menu_memory[btnr][3], velocity);  //3=pitchNr 2=channel
    
    if (IS_DEBUG)  Serial.print(btnr+1);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG)  Serial.print((menu_memory[btnr][2]));  //2=channel
    if (IS_DEBUG) Serial.print("  ");
    if (IS_DEBUG) Serial.print(menu_memory[btnr][3]);  //3=pitchNr
    if  (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(raw);
    if  (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(velocity);
    if (IS_DEBUG) Serial.print(" --> ");

    sprintf(atext,"%d ",btnr+1);  // live monitor
    printAt(1,7,false,atext);
    printAt(3,7,false,"P");
    sprintf(atext,"%d  ",menu_memory[btnr][2]);  //2=channel
    printAt(5,7,false,atext);
    sprintf(atext,"%d   ",raw);
    printAt(8,7,false,atext);
    sprintf(atext,"%d   ",velocity);
    printAt(12,7,false,atext);
    sprintf(atext,"%d     ",menu_memory[btnr][3]);  //3=pitchNr
    APitch = menu_memory[btnr][3];
    AOctave = ((int(APitch  / 12)) - 2);
    ANote = (APitch-((AOctave+2)*12) + 1);
    s_substring(apark,  sizeof(atext), tableNotes, sizeof(tableNotes), (ANote-1) * 3, ((ANote-1) * 3)+1);
    sprintf(atext,"%s/%d ",apark,AOctave);
    printAt(16,7,false,atext);
    display.display();

    if (IS_DEBUG) Serial.print(APitch);
    if  (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(AOctave);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.print(ANote);
    if (IS_DEBUG) Serial.print(" ");
    if (IS_DEBUG) Serial.println(atext);
    
    prevValue[btnr]=velocity;
    drum_velocity=0;
    drum_isPressed  = false;
    analogWrite(leds[btnr], (velocity*2));
    delay(menu_memory[btnr][4]);  //4=timeinterval
    analogWrite(leds[btnr], off);
  }  // if(drum1_isPressed)
}  // readDrum()


// First parameter is the event type (0x0B = control  change) 4 bits
// Second parameter is the event type, combined with the channel,  above 4 bits + channel 4 bits
// Third parameter is the control number (0-119).
//  Fourth parameter is the control value (0-127).
// --------------------------------------------------------------
void  controlChange(byte channel, byte control, byte value) {
  midiEventPacket_t midiCc  = {0x0B, byte (0xB0 | channel), control, value};
  MidiUSB.sendMIDI(midiCc);  // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0xB0 | channel);  // to  serial1 MIDI
  Serial1.write(control);
  Serial1.write(value);
}

//  First parameter is the event type (0x09 = note on, 0x08 = note off) 4 bits
//  Second parameter is note-on/note-off, combined with the channel, above 4 bits +  channel 4 bits
// Channel between 0-15. Typically reported to the user as 1-16
//  Third parameter is the note number, the pitch, (48 = middle C).
// Fourth parameter  is the velocity (0 = none, 64 = normal, 127 = louder/faster).
// --------------------------------------------------------------
void  playNoteOn(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOn  = {0x09, byte (0x90 | channel), pitch, velocity};
  MidiUSB.sendMIDI(noteOn);  // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0x90 | channel);  // to  serial1 MIDI
  Serial1.write(pitch);
  Serial1.write(velocity);
}
void  playNoteOff(byte channel, byte pitch, byte velocity) {
  midiEventPacket_t noteOff  = {0x08, byte (0x80 | channel), pitch, velocity};
  MidiUSB.sendMIDI(noteOff);  // to USB MIDI
  MidiUSB.flush();
  Serial1.write(0x80 | channel);  // to  serial1 MIDI
  Serial1.write(pitch);
  Serial1.write(velocity);
}

//-------------------------------------------------------------------------  SUBSTRING
bool s_substring(char *dest_string, const int dest_sizeof, const char  *source_string, 
 const int source_sizeof, const int source_from, const int source_to)  {  // copies source(from, to) to dest
  if ((source_from < 0) || (source_to <  source_from) || ((source_to - source_from + 1) > (dest_sizeof - 1)) 
    || (source_to  >= (source_sizeof-1)) || ((source_to - source_from + 1) > (strlen(source_string))))  {
    dest_string[0]=0;  // NUL
    return true;  // err 1
  } else {
    int _Count=0;
    for (int i=source_from;i<(source_to+1);i++) {
      dest_string[_Count]=source_string[i];
      _Count++;
    }
    dest_string[_Count]=0;  // ends with NUL
    return  false;  // ok 0
  }
}  // end s_substring()

Downloadable files

PCB #2 overview