49-Key Keyboard (Je Sus 49)

A 49-Key Keyboard named the JeSus 49 running on the Arduino Micro supporting multiple layers.

Dec 31, 2021

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3 respects

communication

internet of things

keyboard

Components and supplies

Keyboard Stabilizer (Cherry style PCB Screw In)

Right Angle Single Row Male Header 2.54mm Pitch

Extensive Keycap Set (Cherry Style)

Arduino Micro

3.6V 0.5W Zener Diode

Keyboard Switch (Cherry or Kailh style)

Female Pin Header Breakaway 2.54mm Pitch

Micro-USB to USB Cable (Generic)

Female/Female Jumper Wires

Tools and machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Soldering iron (generic)

Apps and platforms

Arduino IDE

KiCad

Project description

Code

49KB.ino

c_cpp

The C++ File for the Arduino/PCB.

1#include <Keyboard.h>
2
3const int r0 = 2;
4const int r1 = 3;
5const   int r2 = 4;
6const int r3 = 5;
7
8const int c0 = 6;
9const int c1 = 7;
10const   int c2 = 8;
11const int c3 = 9;
12const int c4 = 10;
13const int c5 = 11;
14const   int c6 = 12;
15const int c7 = 13;
16const int c8 = 14;
17const int c9 = 15;
18const   int c10 = 16;
19const int c11 = 17;
20const int c12 = 18;
21const int c13 = 19;
22
23int   layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;   2 being gamr mode (replace wasd with arrows)
24bool modeHold = false; //if you   are holding the mode button
25
26void setup() {
27  pinMode(c0, OUTPUT);
28   pinMode(c1, OUTPUT);
29  pinMode(c2, OUTPUT);
30  pinMode(c3, OUTPUT);
31  pinMode(c4,   OUTPUT);
32  pinMode(c5, OUTPUT);
33  pinMode(c6, OUTPUT);
34  pinMode(c7, OUTPUT);
35   pinMode(c8, OUTPUT);
36  pinMode(c9, OUTPUT);
37  pinMode(c10, OUTPUT);
38   pinMode(c11, OUTPUT);
39  pinMode(c12, OUTPUT);
40  pinMode(c13, OUTPUT);
41
42   digitalWrite(c0, HIGH);
43  digitalWrite(c1, HIGH);
44  digitalWrite(c2, HIGH);
45   digitalWrite(c3, HIGH);
46  digitalWrite(c4, HIGH);
47  digitalWrite(c5, HIGH);
48   digitalWrite(c6, HIGH);
49  digitalWrite(c7, HIGH);
50  digitalWrite(c8, HIGH);
51   digitalWrite(c9, HIGH);
52  digitalWrite(c10, HIGH);
53  digitalWrite(c11, HIGH);
54   digitalWrite(c12, HIGH);
55  digitalWrite(c13, HIGH);
56
57  pinMode(r0, INPUT_PULLUP);
58   pinMode(r1, INPUT_PULLUP);
59  pinMode(r2, INPUT_PULLUP);
60  pinMode(r3, INPUT_PULLUP);
61
62   Keyboard.begin();
63  
64}
65
66void loop() {
67  
68  digitalWrite(c0,   LOW);
69  if (digitalRead(r0) == 0) {
70    if ((layer == 0) or (layer == 2))   Keyboard.press(KEY_ESC);
71    if (layer == 1) Keyboard.press(KEY_TAB);
72  }   else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
73  if (digitalRead(r1)   == 0) {
74    Keyboard.press(KEY_CAPS_LOCK);
75  } else { Keyboard.release(KEY_CAPS_LOCK);   }
76  if (digitalRead(r2) == 0) {
77    Keyboard.press(KEY_LEFT_SHIFT);
78  }   else { Keyboard.release(KEY_LEFT_SHIFT); }
79  if (digitalRead(r3) == 0) {
80     Keyboard.press(KEY_LEFT_CTRL);
81  } else { Keyboard.release(KEY_LEFT_CTRL);   }
82  digitalWrite(c0, HIGH);
83
84  digitalWrite(c1, LOW);
85  if (digitalRead(r0)   == 0) {
86    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
87    if   (layer == 1) Keyboard.press('1');
88  } else { Keyboard.release('q'); Keyboard.release('1');   }
89  if (digitalRead(r1) == 0) {
90    if (layer == 0) Keyboard.press ('a');
91     if (layer == 1) Keyboard.press(KEY_F1);
92    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
93   } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);   }
94  if (digitalRead(r2) == 0) {
95    if ((layer == 0) or (layer == 2)) Keyboard.press   ('z');
96    if (layer == 1) Keyboard.press(KEY_F12);
97  } else { Keyboard.release('z');   Keyboard.release(KEY_F12); }
98  if (digitalRead(r3) == 0) {
99    Keyboard.press(KEY_LEFT_GUI);
100   } else { Keyboard.release(KEY_LEFT_GUI); }
101  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
102
103   digitalWrite(c2, LOW);
104  if (digitalRead(r0) == 0) {
105    if (layer == 0)   Keyboard.press ('w');
106    if (layer == 1) Keyboard.press('2');
107    if (layer   == 2) Keyboard.press(KEY_UP_ARROW);
108  } else { Keyboard.release('w'); Keyboard.release('2');   Keyboard.release(KEY_UP_ARROW); }
109  if (digitalRead(r1) == 0) {
110    if (layer   == 0) Keyboard.press ('s');
111    if (layer == 1) Keyboard.press(KEY_F2);
112    if   (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
113  } else { Keyboard.release('a');   Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
114  if (digitalRead(r2)   == 0) {
115    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
116    if   (layer == 1) Keyboard.press(KEY_F13);
117  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);   }
118  if (digitalRead(r3) == 0) {
119    Keyboard.press(KEY_LEFT_ALT); //operating   system
120  } else { Keyboard.release(KEY_LEFT_ALT); }
121  digitalWrite(c2, HIGH);
122
123   digitalWrite(c3, LOW);
124  if (digitalRead(r0) == 0) {
125    if ((layer == 0)   or (layer == 2)) Keyboard.press ('e');
126    if (layer == 1) Keyboard.press('3');
127   } else { Keyboard.release('e'); Keyboard.release('3'); }
128  if (digitalRead(r1)   == 0) {
129    if (layer == 0) Keyboard.press ('d');
130    if (layer == 1) Keyboard.press(KEY_F3);
131     if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
132  } else { Keyboard.release('d');   Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
133  digitalWrite(c3,   LOW);
134  if (digitalRead(r0) == 0) {
135    if ((layer == 0) or (layer == 2))   Keyboard.press ('c');
136    if (layer == 1) Keyboard.press(KEY_F14);
137  } else   { Keyboard.release('c'); Keyboard.release(KEY_F14); }
138  digitalWrite(c3, HIGH);
139
140   digitalWrite(c4, LOW);
141  if (digitalRead(r0) == 0) {
142    if ((layer == 0)   or (layer == 2)) Keyboard.press ('r');
143    if (layer == 1) Keyboard.press('4');
144   } else { Keyboard.release('r'); Keyboard.release('4'); }
145  if (digitalRead(r1)   == 0) {
146    if ((layer == 0) or (layer == 2)) Keyboard.press ('f');
147    if   (layer == 1) Keyboard.press(KEY_F4);
148  } else { Keyboard.release('f'); Keyboard.release(KEY_F4);   }
149  if (digitalRead(r0) == 0) {
150    if ((layer == 0) or (layer == 2)) Keyboard.press   ('v');
151    if (layer == 1) Keyboard.press(KEY_F15);
152  } else { Keyboard.release('v');   Keyboard.release(KEY_F15); }
153  if (digitalRead(r3) == 0) {
154    Keyboard.press('   ');
155  } else { Keyboard.release(' '); }
156  digitalWrite(c4, HIGH);
157
158   digitalWrite(c5, LOW);
159  if (digitalRead(r0) == 0) {
160    if ((layer == 0)   or (layer == 2)) Keyboard.press ('t');
161    if (layer == 1) Keyboard.press('5');
162   } else { Keyboard.release('t'); Keyboard.release('5'); }
163  if (digitalRead(r1)   == 0) {
164    if ((layer == 0) or (layer == 2)) Keyboard.press ('g');
165    if   (layer == 1) Keyboard.press(KEY_F5);
166  } else { Keyboard.release('g'); Keyboard.release(KEY_F5);   }
167  if (digitalRead(r2) == 0) {
168    if ((layer == 0) or (layer == 2)) Keyboard.press   ('b');
169    if (layer == 1) Keyboard.press(206);
170  } else { Keyboard.release('b');   Keyboard.release(206); } //prntscreen ascii 206
171  digitalWrite(c5, HIGH);
172
173   digitalWrite(c6, LOW);
174  if (digitalRead(r0) == 0) {
175    if ((layer == 0)   or (layer == 2)) Keyboard.press ('[');
176    if (layer == 1) Keyboard.press('6');
177   } else { Keyboard.release('['); Keyboard.release('6'); }
178  if (digitalRead(r1)   == 0) {
179    if ((layer == 0) or (layer == 2)) Keyboard.press (';');
180    if   (layer == 1) Keyboard.press(KEY_F6);
181  } else { Keyboard.release(';'); Keyboard.release(KEY_F6);   }
182  if (digitalRead(r2) == 0) {
183    if ((layer == 0) or (layer == 2)) Keyboard.press   (',');
184    if (layer == 1) Keyboard.press(KEY_INSERT);
185  } else { Keyboard.release(',');   Keyboard.release(KEY_INSERT); }
186  if (digitalRead(r3) == 0) {
187    if (modeHold   == false) {
188      if (layer == 0) {
189        layer = 1;
190      } else if   (layer == 1) {
191        layer = 2;
192      } else if (layer == 2) { layer = 0;   }
193      modeHold = true;
194    }
195  } else { modeHold = false; }
196  digitalWrite(c6,   HIGH);
197
198  digitalWrite(c7, LOW);
199  if (digitalRead(r0) == 0) {
200    if   ((layer == 0) or (layer == 2)) Keyboard.press (']');
201    if (layer == 1) Keyboard.press('7');
202   } else { Keyboard.release(']'); Keyboard.release('7'); }
203  if (digitalRead(r1)   == 0) {
204    if ((layer == 0) or (layer == 2)) Keyboard.press ('\\''); // \\'   meant for ' so more like " ' "
205    if (layer == 1) Keyboard.press(KEY_F7);
206   } else { Keyboard.release('\\''); Keyboard.release(KEY_F7); }
207  if (digitalRead(r2)   == 0) {
208    if ((layer == 0) or (layer == 2)) Keyboard.press ('.');
209    if   (layer == 1) Keyboard.press(KEY_HOME);
210  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME);   }
211  digitalWrite(c7, HIGH);
212
213  digitalWrite(c8, LOW);
214  if (digitalRead(r0)   == 0) {
215    if ((layer == 0) or (layer == 2)) Keyboard.press ('y');
216    if   (layer == 1) Keyboard.press('8');
217  } else { Keyboard.release('y'); Keyboard.release('8');   }
218  if (digitalRead(r1) == 0) {
219    if ((layer == 0) or (layer == 2)) Keyboard.press   ('h');
220    if (layer == 1) Keyboard.press(KEY_F8);
221  } else { Keyboard.release('h');   Keyboard.release(KEY_F8); }
222  if (digitalRead(r2) == 0) {
223    if ((layer ==   0) or (layer == 2)) Keyboard.press ('n');
224    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
225   } else { Keyboard.release('n'); Keyboard.release(KEY_PAGE_UP); }
226  if (digitalRead(r2)   == 0) { Keyboard.press(' '); } else { Keyboard.release(' '); }
227  digitalWrite(c8,   HIGH);
228
229  digitalWrite(c9, LOW);
230  if (digitalRead(r0) == 0) {
231    if   ((layer == 0) or (layer == 2)) Keyboard.press ('u');
232    if (layer == 1) Keyboard.press('9');
233   } else { Keyboard.release('u'); Keyboard.release('9'); }
234  if (digitalRead(r1)   == 0) {
235    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
236    if   (layer == 1) Keyboard.press(KEY_F9);
237  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);   }
238  if (digitalRead(r2) == 0) {
239    if ((layer == 0) or (layer == 2)) Keyboard.press   ('m');
240    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
241  } else { Keyboard.release(KEY_PAGE_DOWN);   Keyboard.release('m'); }
242  digitalWrite(c9, HIGH);
243
244  digitalWrite(c10,   LOW);
245  if (digitalRead(r0) == 0) {
246    if ((layer == 0) or (layer == 2))   Keyboard.press ('i');
247    if (layer == 1) Keyboard.press('0');
248  } else {   Keyboard.release('i'); Keyboard.release('0'); }
249  if (digitalRead(r1) == 0) {
250     if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
251    if (layer ==   1) Keyboard.press(KEY_F10);
252  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);   }
253  if (digitalRead(r2) == 0) {
254    if ((layer == 0) or (layer == 2)) Keyboard.press   ('/');
255    if (layer == 1) Keyboard.press(KEY_END);
256  } else { Keyboard.release(KEY_END);   Keyboard.release('/'); }
257  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);   } else { Keyboard.release(KEY_RIGHT_ALT); }
258  digitalWrite(c10, HIGH);
259
260   digitalWrite(c11, LOW);
261  if (digitalRead(r0) == 0) {
262    if ((layer ==   0) or (layer == 2)) Keyboard.press ('o');
263    if (layer == 1) Keyboard.press('-');
264   } else { Keyboard.release('-'); Keyboard.release('o'); }
265  if (digitalRead(r1)   == 0) {
266    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
267    if   (layer == 1) Keyboard.press(KEY_F11);
268  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);   }//start A circut
269  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);   } else { Keyboard.release(KEY_RIGHT_SHIFT); }
270  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);   } else { Keyboard.release(KEY_RIGHT_GUI); }
271  digitalWrite(c11, HIGH);
272
273   digitalWrite(c12, LOW);
274  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==   0))
275  digitalWrite(c12, HIGH);
276
277  digitalWrite(c13, LOW);
278  if (digitalRead(r0)   == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);   }
279  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);   }
280  if (digitalRead(r2) == 0) {
281    if ((layer == 0) or (layer == 2)) Keyboard.press   ('`');
282    if (layer == 1) Keyboard.press(92);
283  } else { Keyboard.release(92);   Keyboard.release('`'); } // backslash ascii 92
284  if (digitalRead(r3) == 0) {   Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
285   digitalWrite(c13, HIGH);
286}
287

#include <Keyboard.h>

const int r0 = 2;
const int r1 = 3;
const   int r2 = 4;
const int r3 = 5;

const int c0 = 6;
const int c1 = 7;
const   int c2 = 8;
const int c3 = 9;
const int c4 = 10;
const int c5 = 11;
const   int c6 = 12;
const int c7 = 13;
const int c8 = 14;
const int c9 = 15;
const   int c10 = 16;
const int c11 = 17;
const int c12 = 18;
const int c13 = 19;

int   layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;   2 being gamr mode (replace wasd with arrows)
bool modeHold = false; //if you   are holding the mode button

void setup() {
  pinMode(c0, OUTPUT);
   pinMode(c1, OUTPUT);
  pinMode(c2, OUTPUT);
  pinMode(c3, OUTPUT);
  pinMode(c4,   OUTPUT);
  pinMode(c5, OUTPUT);
  pinMode(c6, OUTPUT);
  pinMode(c7, OUTPUT);
   pinMode(c8, OUTPUT);
  pinMode(c9, OUTPUT);
  pinMode(c10, OUTPUT);
   pinMode(c11, OUTPUT);
  pinMode(c12, OUTPUT);
  pinMode(c13, OUTPUT);

   digitalWrite(c0, HIGH);
  digitalWrite(c1, HIGH);
  digitalWrite(c2, HIGH);
   digitalWrite(c3, HIGH);
  digitalWrite(c4, HIGH);
  digitalWrite(c5, HIGH);
   digitalWrite(c6, HIGH);
  digitalWrite(c7, HIGH);
  digitalWrite(c8, HIGH);
   digitalWrite(c9, HIGH);
  digitalWrite(c10, HIGH);
  digitalWrite(c11, HIGH);
   digitalWrite(c12, HIGH);
  digitalWrite(c13, HIGH);

  pinMode(r0, INPUT_PULLUP);
   pinMode(r1, INPUT_PULLUP);
  pinMode(r2, INPUT_PULLUP);
  pinMode(r3, INPUT_PULLUP);

   Keyboard.begin();
  
}

void loop() {
  
  digitalWrite(c0,   LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))   Keyboard.press(KEY_ESC);
    if (layer == 1) Keyboard.press(KEY_TAB);
  }   else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
  if (digitalRead(r1)   == 0) {
    Keyboard.press(KEY_CAPS_LOCK);
  } else { Keyboard.release(KEY_CAPS_LOCK);   }
  if (digitalRead(r2) == 0) {
    Keyboard.press(KEY_LEFT_SHIFT);
  }   else { Keyboard.release(KEY_LEFT_SHIFT); }
  if (digitalRead(r3) == 0) {
     Keyboard.press(KEY_LEFT_CTRL);
  } else { Keyboard.release(KEY_LEFT_CTRL);   }
  digitalWrite(c0, HIGH);

  digitalWrite(c1, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
    if   (layer == 1) Keyboard.press('1');
  } else { Keyboard.release('q'); Keyboard.release('1');   }
  if (digitalRead(r1) == 0) {
    if (layer == 0) Keyboard.press ('a');
     if (layer == 1) Keyboard.press(KEY_F1);
    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
   } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('z');
    if (layer == 1) Keyboard.press(KEY_F12);
  } else { Keyboard.release('z');   Keyboard.release(KEY_F12); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_GUI);
   } else { Keyboard.release(KEY_LEFT_GUI); }
  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

   digitalWrite(c2, LOW);
  if (digitalRead(r0) == 0) {
    if (layer == 0)   Keyboard.press ('w');
    if (layer == 1) Keyboard.press('2');
    if (layer   == 2) Keyboard.press(KEY_UP_ARROW);
  } else { Keyboard.release('w'); Keyboard.release('2');   Keyboard.release(KEY_UP_ARROW); }
  if (digitalRead(r1) == 0) {
    if (layer   == 0) Keyboard.press ('s');
    if (layer == 1) Keyboard.press(KEY_F2);
    if   (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
  } else { Keyboard.release('a');   Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
  if (digitalRead(r2)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
    if   (layer == 1) Keyboard.press(KEY_F13);
  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);   }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_ALT); //operating   system
  } else { Keyboard.release(KEY_LEFT_ALT); }
  digitalWrite(c2, HIGH);

   digitalWrite(c3, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('e');
    if (layer == 1) Keyboard.press('3');
   } else { Keyboard.release('e'); Keyboard.release('3'); }
  if (digitalRead(r1)   == 0) {
    if (layer == 0) Keyboard.press ('d');
    if (layer == 1) Keyboard.press(KEY_F3);
     if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
  } else { Keyboard.release('d');   Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
  digitalWrite(c3,   LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))   Keyboard.press ('c');
    if (layer == 1) Keyboard.press(KEY_F14);
  } else   { Keyboard.release('c'); Keyboard.release(KEY_F14); }
  digitalWrite(c3, HIGH);

   digitalWrite(c4, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('r');
    if (layer == 1) Keyboard.press('4');
   } else { Keyboard.release('r'); Keyboard.release('4'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('f');
    if   (layer == 1) Keyboard.press(KEY_F4);
  } else { Keyboard.release('f'); Keyboard.release(KEY_F4);   }
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('v');
    if (layer == 1) Keyboard.press(KEY_F15);
  } else { Keyboard.release('v');   Keyboard.release(KEY_F15); }
  if (digitalRead(r3) == 0) {
    Keyboard.press('   ');
  } else { Keyboard.release(' '); }
  digitalWrite(c4, HIGH);

   digitalWrite(c5, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('t');
    if (layer == 1) Keyboard.press('5');
   } else { Keyboard.release('t'); Keyboard.release('5'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('g');
    if   (layer == 1) Keyboard.press(KEY_F5);
  } else { Keyboard.release('g'); Keyboard.release(KEY_F5);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('b');
    if (layer == 1) Keyboard.press(206);
  } else { Keyboard.release('b');   Keyboard.release(206); } //prntscreen ascii 206
  digitalWrite(c5, HIGH);

   digitalWrite(c6, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('[');
    if (layer == 1) Keyboard.press('6');
   } else { Keyboard.release('['); Keyboard.release('6'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press (';');
    if   (layer == 1) Keyboard.press(KEY_F6);
  } else { Keyboard.release(';'); Keyboard.release(KEY_F6);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   (',');
    if (layer == 1) Keyboard.press(KEY_INSERT);
  } else { Keyboard.release(',');   Keyboard.release(KEY_INSERT); }
  if (digitalRead(r3) == 0) {
    if (modeHold   == false) {
      if (layer == 0) {
        layer = 1;
      } else if   (layer == 1) {
        layer = 2;
      } else if (layer == 2) { layer = 0;   }
      modeHold = true;
    }
  } else { modeHold = false; }
  digitalWrite(c6,   HIGH);

  digitalWrite(c7, LOW);
  if (digitalRead(r0) == 0) {
    if   ((layer == 0) or (layer == 2)) Keyboard.press (']');
    if (layer == 1) Keyboard.press('7');
   } else { Keyboard.release(']'); Keyboard.release('7'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('\\''); // \\'   meant for ' so more like " ' "
    if (layer == 1) Keyboard.press(KEY_F7);
   } else { Keyboard.release('\\''); Keyboard.release(KEY_F7); }
  if (digitalRead(r2)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('.');
    if   (layer == 1) Keyboard.press(KEY_HOME);
  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME);   }
  digitalWrite(c7, HIGH);

  digitalWrite(c8, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('y');
    if   (layer == 1) Keyboard.press('8');
  } else { Keyboard.release('y'); Keyboard.release('8');   }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('h');
    if (layer == 1) Keyboard.press(KEY_F8);
  } else { Keyboard.release('h');   Keyboard.release(KEY_F8); }
  if (digitalRead(r2) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('n');
    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
   } else { Keyboard.release('n'); Keyboard.release(KEY_PAGE_UP); }
  if (digitalRead(r2)   == 0) { Keyboard.press(' '); } else { Keyboard.release(' '); }
  digitalWrite(c8,   HIGH);

  digitalWrite(c9, LOW);
  if (digitalRead(r0) == 0) {
    if   ((layer == 0) or (layer == 2)) Keyboard.press ('u');
    if (layer == 1) Keyboard.press('9');
   } else { Keyboard.release('u'); Keyboard.release('9'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
    if   (layer == 1) Keyboard.press(KEY_F9);
  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('m');
    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
  } else { Keyboard.release(KEY_PAGE_DOWN);   Keyboard.release('m'); }
  digitalWrite(c9, HIGH);

  digitalWrite(c10,   LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))   Keyboard.press ('i');
    if (layer == 1) Keyboard.press('0');
  } else {   Keyboard.release('i'); Keyboard.release('0'); }
  if (digitalRead(r1) == 0) {
     if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
    if (layer ==   1) Keyboard.press(KEY_F10);
  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('/');
    if (layer == 1) Keyboard.press(KEY_END);
  } else { Keyboard.release(KEY_END);   Keyboard.release('/'); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);   } else { Keyboard.release(KEY_RIGHT_ALT); }
  digitalWrite(c10, HIGH);

   digitalWrite(c11, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('o');
    if (layer == 1) Keyboard.press('-');
   } else { Keyboard.release('-'); Keyboard.release('o'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
    if   (layer == 1) Keyboard.press(KEY_F11);
  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);   }//start A circut
  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);   } else { Keyboard.release(KEY_RIGHT_SHIFT); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);   } else { Keyboard.release(KEY_RIGHT_GUI); }
  digitalWrite(c11, HIGH);

   digitalWrite(c12, LOW);
  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==   0))
  digitalWrite(c12, HIGH);

  digitalWrite(c13, LOW);
  if (digitalRead(r0)   == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);   }
  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('`');
    if (layer == 1) Keyboard.press(92);
  } else { Keyboard.release(92);   Keyboard.release('`'); } // backslash ascii 92
  if (digitalRead(r3) == 0) {   Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
   digitalWrite(c13, HIGH);
}

KB49

c_cpp

1#include <Keyboard.h>
2
3const int r0 = 2;
4const int r1 = 3;
5const   int r2 = 4;
6const int r3 = 5;
7
8const int c0 = 6;
9const int c1 = 7;
10const   int c2 = 8;
11const int c3 = 9;
12const int c4 = 10;
13const int c5 = 11;
14const   int c6 = 12;
15const int c7 = 13;
16const int c8 = 14;
17const int c9 = 15;
18const   int c10 = 16;
19const int c11 = 17;
20const int c12 = 18;
21const int c13 = 19;
22
23int   layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;   2 being gamr mode (replace wasd with arrows)
24bool modeHold = false; //if you   are holding the mode button
25
26void setup() {   
27  pinMode(c0, OUTPUT);
28   pinMode(c1, OUTPUT);
29  pinMode(c2, OUTPUT);
30  pinMode(c3, OUTPUT);
31  pinMode(c4,   OUTPUT);
32  pinMode(c5, OUTPUT);
33  pinMode(c6, OUTPUT);
34  pinMode(c7, OUTPUT);
35   pinMode(c8, OUTPUT);
36  pinMode(c9, OUTPUT);
37  pinMode(c10, OUTPUT);
38   pinMode(c11, OUTPUT);
39  pinMode(c12, OUTPUT);
40  pinMode(c13, OUTPUT);
41
42   digitalWrite(c0, HIGH);
43  digitalWrite(c1, HIGH);
44  digitalWrite(c2, HIGH);
45   digitalWrite(c3, HIGH);
46  digitalWrite(c4, HIGH);
47  digitalWrite(c5, HIGH);
48   digitalWrite(c6, HIGH);
49  digitalWrite(c7, HIGH);
50  digitalWrite(c8, HIGH);
51   digitalWrite(c9, HIGH);
52  digitalWrite(c10, HIGH);
53  digitalWrite(c11, HIGH);
54   digitalWrite(c12, HIGH);
55  digitalWrite(c13, HIGH);
56
57  pinMode(r0, INPUT_PULLUP);
58   pinMode(r1, INPUT_PULLUP);
59  pinMode(r2, INPUT_PULLUP);
60  pinMode(r3, INPUT_PULLUP);
61
62   Keyboard.begin();
63  
64}
65
66void loop() {
67  
68  digitalWrite(c0,   LOW);
69  if (digitalRead(r0) == 0) {
70    if ((layer == 0) or (layer == 2))   Keyboard.press(KEY_ESC);
71    if (layer == 1) Keyboard.press(KEY_TAB);
72  }   else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
73  if (digitalRead(r1)   == 0) {
74    Keyboard.press(KEY_CAPS_LOCK);
75  } else { Keyboard.release(KEY_CAPS_LOCK);   }
76  if (digitalRead(r2) == 0) {
77    Keyboard.press(KEY_LEFT_SHIFT);
78  }   else { Keyboard.release(KEY_LEFT_SHIFT); }
79  if (digitalRead(r3) == 0) {
80     Keyboard.press(KEY_LEFT_CTRL);
81  } else { Keyboard.release(KEY_LEFT_CTRL);   }
82  digitalWrite(c0, HIGH);
83
84  digitalWrite(c1, LOW);
85  if (digitalRead(r0)   == 0) {
86    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
87    if   (layer == 1) Keyboard.press('1');
88  } else { Keyboard.release('q'); Keyboard.release('1');   }
89  if (digitalRead(r1) == 0) {
90    if (layer == 0) Keyboard.press ('a');
91     if (layer == 1) Keyboard.press(KEY_F1);
92    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
93   } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);   }
94  if (digitalRead(r2) == 0) {
95    if ((layer == 0) or (layer == 2)) Keyboard.press   ('z');
96    if (layer == 1) Keyboard.press(KEY_F12);
97  } else { Keyboard.release('z');   Keyboard.release(KEY_F12); }
98  if (digitalRead(r3) == 0) {
99    Keyboard.press(KEY_LEFT_GUI);
100   } else { Keyboard.release(KEY_LEFT_GUI); }
101  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
102
103   digitalWrite(c2, LOW);
104  if (digitalRead(r0) == 0) {
105    if (layer == 0)   Keyboard.press ('w');
106    if (layer == 1) Keyboard.press('2');
107    if (layer   == 2) Keyboard.press(KEY_UP_ARROW);
108  } else { Keyboard.release('w'); Keyboard.release('2');   Keyboard.release(KEY_UP_ARROW); }
109  if (digitalRead(r1) == 0) {
110    if (layer   == 0) Keyboard.press ('s');
111    if (layer == 1) Keyboard.press(KEY_F2);
112    if   (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
113  } else { Keyboard.release('s');   Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
114  if (digitalRead(r2)   == 0) {
115    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
116    if   (layer == 1) Keyboard.press(KEY_F13);
117  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);   }
118  if (digitalRead(r3) == 0) {
119    Keyboard.press(KEY_LEFT_ALT); //operating   system
120  } else { Keyboard.release(KEY_LEFT_ALT); }
121  digitalWrite(c2, HIGH);
122
123   digitalWrite(c3, LOW);
124  if (digitalRead(r0) == 0) {
125    if ((layer == 0)   or (layer == 2)) Keyboard.press ('e');
126    if (layer == 1) Keyboard.press('3');
127   } else { Keyboard.release('e'); Keyboard.release('3'); }
128  if (digitalRead(r1)   == 0) {
129    if (layer == 0) Keyboard.press ('d');
130    if (layer == 1) Keyboard.press(KEY_F3);
131     if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
132  } else { Keyboard.release('d');   Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
133  if (digitalRead(r2)   == 0) {
134    if ((layer == 0) or (layer == 2)) Keyboard.press ('c');
135    if   (layer == 1) Keyboard.press(KEY_F14);
136  } else { Keyboard.release('c'); Keyboard.release(KEY_F14);   }
137  digitalWrite(c3, HIGH);
138
139  digitalWrite(c4, LOW);
140  if (digitalRead(r0)   == 0) {
141    if ((layer == 0) or (layer == 2)) Keyboard.press ('r');
142    if   (layer == 1) Keyboard.press('4');
143  } else { Keyboard.release('r'); Keyboard.release('4');   }
144  if (digitalRead(r1) == 0) {
145    if ((layer == 0) or (layer == 2)) Keyboard.press   ('f');
146    if (layer == 1) Keyboard.press(KEY_F4);
147  } else { Keyboard.release('f');   Keyboard.release(KEY_F4); }
148  if (digitalRead(r2) == 0) {
149    if ((layer ==   0) or (layer == 2)) Keyboard.press ('v');
150    if (layer == 1) Keyboard.press(KEY_F15);
151   } else { Keyboard.release('v'); Keyboard.release(KEY_F15); }
152  if (digitalRead(r3)   == 0) {
153    Keyboard.press(' ');
154     delay(50);
155  } else { Keyboard.release('   '); }
156  digitalWrite(c4, HIGH);
157
158  digitalWrite(c5, LOW);
159  if (digitalRead(r0)   == 0) {
160    if ((layer == 0) or (layer == 2)) Keyboard.press ('t');
161    if   (layer == 1) Keyboard.press('5');
162  } else { Keyboard.release('t'); Keyboard.release('5');   }
163  if (digitalRead(r1) == 0) {
164    if ((layer == 0) or (layer == 2)) Keyboard.press   ('g');
165    if (layer == 1) Keyboard.press(KEY_F5);
166  } else { Keyboard.release('g');   Keyboard.release(KEY_F5); }
167  if (digitalRead(r2) == 0) {
168    if ((layer ==   0) or (layer == 2)) Keyboard.press ('b');
169    if (layer == 1) Keyboard.press(206);
170   } else { Keyboard.release('b'); Keyboard.release(206); } //prntscreen ascii 206
171   digitalWrite(c5, HIGH);
172
173  digitalWrite(c6, LOW);
174  if (digitalRead(r0)   == 0) {
175    if ((layer == 0) or (layer == 2)) Keyboard.press ('[');
176    if   (layer == 1) Keyboard.press('6');
177  } else { Keyboard.release('['); Keyboard.release('6');   }
178  if (digitalRead(r1) == 0) {
179    if ((layer == 0) or (layer == 2)) Keyboard.press   (';');
180    if (layer == 1) Keyboard.press(KEY_F6);
181  } else { Keyboard.release(';');   Keyboard.release(KEY_F6); }
182  if (digitalRead(r2) == 0) {
183    if ((layer ==   0) or (layer == 2)) Keyboard.press (',');
184    if (layer == 1) Keyboard.press(KEY_INSERT);
185   } else { Keyboard.release(','); Keyboard.release(KEY_INSERT); }
186  if (digitalRead(r3)   == 0) {
187    if (modeHold == false) {
188      if (layer == 0) {
189        layer   = 1;
190      } else if (layer == 1) {
191        layer = 2;
192      } else if   (layer == 2) { layer = 0; }
193      modeHold = true;
194    }
195  } else { modeHold   = false; }
196  digitalWrite(c6, HIGH);
197
198  digitalWrite(c7, LOW);
199  if   (digitalRead(r0) == 0) {
200    if ((layer == 0) or (layer == 2)) Keyboard.press   (']');
201    if (layer == 1) Keyboard.press('7');
202  } else { Keyboard.release(']');   Keyboard.release('7'); }
203  if (digitalRead(r1) == 0) {
204    if ((layer == 0)   or (layer == 2)) Keyboard.press ('\\''); // \\' meant for ' so more like " ' "
205     if (layer == 1) Keyboard.press(KEY_F7);
206  } else { Keyboard.release('\\'');   Keyboard.release(KEY_F7); }
207  if (digitalRead(r2) == 0) {
208    if ((layer ==   0) or (layer == 2)) Keyboard.press ('.');
209    if (layer == 1) Keyboard.press(KEY_HOME);
210   } else { Keyboard.release('.'); Keyboard.release(KEY_HOME); }
211  digitalWrite(c7,   HIGH);
212
213  digitalWrite(c8, LOW);
214  if (digitalRead(r0) == 0) {
215    if   ((layer == 0) or (layer == 2)) Keyboard.press ('y');
216    if (layer == 1) Keyboard.press('8');
217   } else { Keyboard.release('y'); Keyboard.release('8'); }
218  if (digitalRead(r1)   == 0) {
219    if ((layer == 0) or (layer == 2)) Keyboard.press ('h');
220    if   (layer == 1) Keyboard.press(KEY_F8);
221  } else { Keyboard.release('h'); Keyboard.release(KEY_F8);   }
222  if (digitalRead(r2) == 0) {
223    if ((layer == 0) or (layer == 2)) Keyboard.press   ('n');
224    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
225  } else { Keyboard.release('n');   Keyboard.release(KEY_PAGE_UP); }
226  if (digitalRead(r3) == 0) { Keyboard.press('   ');  delay(50); } else { Keyboard.release(' '); }
227  digitalWrite(c8, HIGH);
228
229   digitalWrite(c9, LOW);
230  if (digitalRead(r0) == 0) {
231    if ((layer == 0)   or (layer == 2)) Keyboard.press ('u');
232    if (layer == 1) Keyboard.press('9');
233   } else { Keyboard.release('u'); Keyboard.release('9'); }
234  if (digitalRead(r1)   == 0) {
235    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
236    if   (layer == 1) Keyboard.press(KEY_F9);
237  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);   }
238  if (digitalRead(r2) == 0) {
239    if ((layer == 0) or (layer == 2)) Keyboard.press   ('m');
240    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
241  } else { Keyboard.release(KEY_PAGE_DOWN);   Keyboard.release('m'); }
242  digitalWrite(c9, HIGH);
243
244  digitalWrite(c10,   LOW);
245  if (digitalRead(r0) == 0) {
246    if ((layer == 0) or (layer == 2))   Keyboard.press ('i');
247    if (layer == 1) Keyboard.press('0');
248  } else {   Keyboard.release('i'); Keyboard.release('0'); }
249  if (digitalRead(r1) == 0) {
250     if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
251    if (layer ==   1) Keyboard.press(KEY_F10);
252  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);   }
253  if (digitalRead(r2) == 0) {
254    if ((layer == 0) or (layer == 2)) Keyboard.press   ('/');
255    if (layer == 1) Keyboard.press(KEY_END);
256  } else { Keyboard.release(KEY_END);   Keyboard.release('/'); }
257  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);   } else { Keyboard.release(KEY_RIGHT_ALT); }
258  digitalWrite(c10, HIGH);
259
260   digitalWrite(c11, LOW);
261  if (digitalRead(r0) == 0) {
262    if ((layer ==   0) or (layer == 2)) Keyboard.press ('o');
263    if (layer == 1) Keyboard.press('-');
264   } else { Keyboard.release('-'); Keyboard.release('o'); }
265  if (digitalRead(r1)   == 0) {
266    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
267    if   (layer == 1) Keyboard.press(KEY_F11);
268  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);   }//start A circut
269  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);   } else { Keyboard.release(KEY_RIGHT_SHIFT); }
270  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);   } else { Keyboard.release(KEY_RIGHT_GUI); }
271  digitalWrite(c11, HIGH);
272
273   digitalWrite(c12, LOW);
274  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==   0)) {
275    if ((layer == 0) or (layer == 2)) Keyboard.press('p');
276    if (layer   == 1) Keyboard.press('=');
277  } else { Keyboard.release('p'); Keyboard.release('=');   }
278  digitalWrite(c12, HIGH);
279
280  digitalWrite(c13, LOW);
281  if (digitalRead(r0)   == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);   }
282  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);   }
283  if (digitalRead(r2) == 0) {
284    if ((layer == 0) or (layer == 2)) Keyboard.press   ('`');
285    if (layer == 1) Keyboard.press(92);
286  } else { Keyboard.release(92);   Keyboard.release('`'); } // backslash ascii 92
287  if (digitalRead(r3) == 0) {   Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
288   digitalWrite(c13, HIGH);
289}
290

#include <Keyboard.h>

const int r0 = 2;
const int r1 = 3;
const   int r2 = 4;
const int r3 = 5;

const int c0 = 6;
const int c1 = 7;
const   int c2 = 8;
const int c3 = 9;
const int c4 = 10;
const int c5 = 11;
const   int c6 = 12;
const int c7 = 13;
const int c8 = 14;
const int c9 = 15;
const   int c10 = 16;
const int c11 = 17;
const int c12 = 18;
const int c13 = 19;

int   layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;   2 being gamr mode (replace wasd with arrows)
bool modeHold = false; //if you   are holding the mode button

void setup() {   
  pinMode(c0, OUTPUT);
   pinMode(c1, OUTPUT);
  pinMode(c2, OUTPUT);
  pinMode(c3, OUTPUT);
  pinMode(c4,   OUTPUT);
  pinMode(c5, OUTPUT);
  pinMode(c6, OUTPUT);
  pinMode(c7, OUTPUT);
   pinMode(c8, OUTPUT);
  pinMode(c9, OUTPUT);
  pinMode(c10, OUTPUT);
   pinMode(c11, OUTPUT);
  pinMode(c12, OUTPUT);
  pinMode(c13, OUTPUT);

   digitalWrite(c0, HIGH);
  digitalWrite(c1, HIGH);
  digitalWrite(c2, HIGH);
   digitalWrite(c3, HIGH);
  digitalWrite(c4, HIGH);
  digitalWrite(c5, HIGH);
   digitalWrite(c6, HIGH);
  digitalWrite(c7, HIGH);
  digitalWrite(c8, HIGH);
   digitalWrite(c9, HIGH);
  digitalWrite(c10, HIGH);
  digitalWrite(c11, HIGH);
   digitalWrite(c12, HIGH);
  digitalWrite(c13, HIGH);

  pinMode(r0, INPUT_PULLUP);
   pinMode(r1, INPUT_PULLUP);
  pinMode(r2, INPUT_PULLUP);
  pinMode(r3, INPUT_PULLUP);

   Keyboard.begin();
  
}

void loop() {
  
  digitalWrite(c0,   LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))   Keyboard.press(KEY_ESC);
    if (layer == 1) Keyboard.press(KEY_TAB);
  }   else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
  if (digitalRead(r1)   == 0) {
    Keyboard.press(KEY_CAPS_LOCK);
  } else { Keyboard.release(KEY_CAPS_LOCK);   }
  if (digitalRead(r2) == 0) {
    Keyboard.press(KEY_LEFT_SHIFT);
  }   else { Keyboard.release(KEY_LEFT_SHIFT); }
  if (digitalRead(r3) == 0) {
     Keyboard.press(KEY_LEFT_CTRL);
  } else { Keyboard.release(KEY_LEFT_CTRL);   }
  digitalWrite(c0, HIGH);

  digitalWrite(c1, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
    if   (layer == 1) Keyboard.press('1');
  } else { Keyboard.release('q'); Keyboard.release('1');   }
  if (digitalRead(r1) == 0) {
    if (layer == 0) Keyboard.press ('a');
     if (layer == 1) Keyboard.press(KEY_F1);
    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
   } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('z');
    if (layer == 1) Keyboard.press(KEY_F12);
  } else { Keyboard.release('z');   Keyboard.release(KEY_F12); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_GUI);
   } else { Keyboard.release(KEY_LEFT_GUI); }
  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

   digitalWrite(c2, LOW);
  if (digitalRead(r0) == 0) {
    if (layer == 0)   Keyboard.press ('w');
    if (layer == 1) Keyboard.press('2');
    if (layer   == 2) Keyboard.press(KEY_UP_ARROW);
  } else { Keyboard.release('w'); Keyboard.release('2');   Keyboard.release(KEY_UP_ARROW); }
  if (digitalRead(r1) == 0) {
    if (layer   == 0) Keyboard.press ('s');
    if (layer == 1) Keyboard.press(KEY_F2);
    if   (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
  } else { Keyboard.release('s');   Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
  if (digitalRead(r2)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
    if   (layer == 1) Keyboard.press(KEY_F13);
  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);   }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_ALT); //operating   system
  } else { Keyboard.release(KEY_LEFT_ALT); }
  digitalWrite(c2, HIGH);

   digitalWrite(c3, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('e');
    if (layer == 1) Keyboard.press('3');
   } else { Keyboard.release('e'); Keyboard.release('3'); }
  if (digitalRead(r1)   == 0) {
    if (layer == 0) Keyboard.press ('d');
    if (layer == 1) Keyboard.press(KEY_F3);
     if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
  } else { Keyboard.release('d');   Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
  if (digitalRead(r2)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('c');
    if   (layer == 1) Keyboard.press(KEY_F14);
  } else { Keyboard.release('c'); Keyboard.release(KEY_F14);   }
  digitalWrite(c3, HIGH);

  digitalWrite(c4, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('r');
    if   (layer == 1) Keyboard.press('4');
  } else { Keyboard.release('r'); Keyboard.release('4');   }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('f');
    if (layer == 1) Keyboard.press(KEY_F4);
  } else { Keyboard.release('f');   Keyboard.release(KEY_F4); }
  if (digitalRead(r2) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('v');
    if (layer == 1) Keyboard.press(KEY_F15);
   } else { Keyboard.release('v'); Keyboard.release(KEY_F15); }
  if (digitalRead(r3)   == 0) {
    Keyboard.press(' ');
     delay(50);
  } else { Keyboard.release('   '); }
  digitalWrite(c4, HIGH);

  digitalWrite(c5, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('t');
    if   (layer == 1) Keyboard.press('5');
  } else { Keyboard.release('t'); Keyboard.release('5');   }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('g');
    if (layer == 1) Keyboard.press(KEY_F5);
  } else { Keyboard.release('g');   Keyboard.release(KEY_F5); }
  if (digitalRead(r2) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('b');
    if (layer == 1) Keyboard.press(206);
   } else { Keyboard.release('b'); Keyboard.release(206); } //prntscreen ascii 206
   digitalWrite(c5, HIGH);

  digitalWrite(c6, LOW);
  if (digitalRead(r0)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('[');
    if   (layer == 1) Keyboard.press('6');
  } else { Keyboard.release('['); Keyboard.release('6');   }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   (';');
    if (layer == 1) Keyboard.press(KEY_F6);
  } else { Keyboard.release(';');   Keyboard.release(KEY_F6); }
  if (digitalRead(r2) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press (',');
    if (layer == 1) Keyboard.press(KEY_INSERT);
   } else { Keyboard.release(','); Keyboard.release(KEY_INSERT); }
  if (digitalRead(r3)   == 0) {
    if (modeHold == false) {
      if (layer == 0) {
        layer   = 1;
      } else if (layer == 1) {
        layer = 2;
      } else if   (layer == 2) { layer = 0; }
      modeHold = true;
    }
  } else { modeHold   = false; }
  digitalWrite(c6, HIGH);

  digitalWrite(c7, LOW);
  if   (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   (']');
    if (layer == 1) Keyboard.press('7');
  } else { Keyboard.release(']');   Keyboard.release('7'); }
  if (digitalRead(r1) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('\\''); // \\' meant for ' so more like " ' "
     if (layer == 1) Keyboard.press(KEY_F7);
  } else { Keyboard.release('\\'');   Keyboard.release(KEY_F7); }
  if (digitalRead(r2) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('.');
    if (layer == 1) Keyboard.press(KEY_HOME);
   } else { Keyboard.release('.'); Keyboard.release(KEY_HOME); }
  digitalWrite(c7,   HIGH);

  digitalWrite(c8, LOW);
  if (digitalRead(r0) == 0) {
    if   ((layer == 0) or (layer == 2)) Keyboard.press ('y');
    if (layer == 1) Keyboard.press('8');
   } else { Keyboard.release('y'); Keyboard.release('8'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('h');
    if   (layer == 1) Keyboard.press(KEY_F8);
  } else { Keyboard.release('h'); Keyboard.release(KEY_F8);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('n');
    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
  } else { Keyboard.release('n');   Keyboard.release(KEY_PAGE_UP); }
  if (digitalRead(r3) == 0) { Keyboard.press('   ');  delay(50); } else { Keyboard.release(' '); }
  digitalWrite(c8, HIGH);

   digitalWrite(c9, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)   or (layer == 2)) Keyboard.press ('u');
    if (layer == 1) Keyboard.press('9');
   } else { Keyboard.release('u'); Keyboard.release('9'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
    if   (layer == 1) Keyboard.press(KEY_F9);
  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('m');
    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
  } else { Keyboard.release(KEY_PAGE_DOWN);   Keyboard.release('m'); }
  digitalWrite(c9, HIGH);

  digitalWrite(c10,   LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))   Keyboard.press ('i');
    if (layer == 1) Keyboard.press('0');
  } else {   Keyboard.release('i'); Keyboard.release('0'); }
  if (digitalRead(r1) == 0) {
     if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
    if (layer ==   1) Keyboard.press(KEY_F10);
  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('/');
    if (layer == 1) Keyboard.press(KEY_END);
  } else { Keyboard.release(KEY_END);   Keyboard.release('/'); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);   } else { Keyboard.release(KEY_RIGHT_ALT); }
  digitalWrite(c10, HIGH);

   digitalWrite(c11, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer ==   0) or (layer == 2)) Keyboard.press ('o');
    if (layer == 1) Keyboard.press('-');
   } else { Keyboard.release('-'); Keyboard.release('o'); }
  if (digitalRead(r1)   == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
    if   (layer == 1) Keyboard.press(KEY_F11);
  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);   }//start A circut
  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);   } else { Keyboard.release(KEY_RIGHT_SHIFT); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);   } else { Keyboard.release(KEY_RIGHT_GUI); }
  digitalWrite(c11, HIGH);

   digitalWrite(c12, LOW);
  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==   0)) {
    if ((layer == 0) or (layer == 2)) Keyboard.press('p');
    if (layer   == 1) Keyboard.press('=');
  } else { Keyboard.release('p'); Keyboard.release('=');   }
  digitalWrite(c12, HIGH);

  digitalWrite(c13, LOW);
  if (digitalRead(r0)   == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);   }
  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);   }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press   ('`');
    if (layer == 1) Keyboard.press(92);
  } else { Keyboard.release(92);   Keyboard.release('`'); } // backslash ascii 92
  if (digitalRead(r3) == 0) {   Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
   digitalWrite(c13, HIGH);
}

KB49

c_cpp

1#include <Keyboard.h>
2
3const int r0 = 2;
4const int r1 = 3;
5const  int r2 = 4;
6const int r3 = 5;
7
8const int c0 = 6;
9const int c1 = 7;
10const  int c2 = 8;
11const int c3 = 9;
12const int c4 = 10;
13const int c5 = 11;
14const  int c6 = 12;
15const int c7 = 13;
16const int c8 = 14;
17const int c9 = 15;
18const  int c10 = 16;
19const int c11 = 17;
20const int c12 = 18;
21const int c13 = 19;
22
23int  layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;  2 being gamr mode (replace wasd with arrows)
24bool modeHold = false; //if you  are holding the mode button
25
26void setup() {   
27  pinMode(c0, OUTPUT);
28  pinMode(c1, OUTPUT);
29  pinMode(c2, OUTPUT);
30  pinMode(c3, OUTPUT);
31  pinMode(c4,  OUTPUT);
32  pinMode(c5, OUTPUT);
33  pinMode(c6, OUTPUT);
34  pinMode(c7, OUTPUT);
35  pinMode(c8, OUTPUT);
36  pinMode(c9, OUTPUT);
37  pinMode(c10, OUTPUT);
38  pinMode(c11, OUTPUT);
39  pinMode(c12, OUTPUT);
40  pinMode(c13, OUTPUT);
41
42  digitalWrite(c0, HIGH);
43  digitalWrite(c1, HIGH);
44  digitalWrite(c2, HIGH);
45  digitalWrite(c3, HIGH);
46  digitalWrite(c4, HIGH);
47  digitalWrite(c5, HIGH);
48  digitalWrite(c6, HIGH);
49  digitalWrite(c7, HIGH);
50  digitalWrite(c8, HIGH);
51  digitalWrite(c9, HIGH);
52  digitalWrite(c10, HIGH);
53  digitalWrite(c11, HIGH);
54  digitalWrite(c12, HIGH);
55  digitalWrite(c13, HIGH);
56
57  pinMode(r0, INPUT_PULLUP);
58  pinMode(r1, INPUT_PULLUP);
59  pinMode(r2, INPUT_PULLUP);
60  pinMode(r3, INPUT_PULLUP);
61
62  Keyboard.begin();
63  
64}
65
66void loop() {
67  
68  digitalWrite(c0,  LOW);
69  if (digitalRead(r0) == 0) {
70    if ((layer == 0) or (layer == 2))  Keyboard.press(KEY_ESC);
71    if (layer == 1) Keyboard.press(KEY_TAB);
72  }  else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
73  if (digitalRead(r1)  == 0) {
74    Keyboard.press(KEY_CAPS_LOCK);
75  } else { Keyboard.release(KEY_CAPS_LOCK);  }
76  if (digitalRead(r2) == 0) {
77    Keyboard.press(KEY_LEFT_SHIFT);
78  }  else { Keyboard.release(KEY_LEFT_SHIFT); }
79  if (digitalRead(r3) == 0) {
80    Keyboard.press(KEY_LEFT_CTRL);
81  } else { Keyboard.release(KEY_LEFT_CTRL);  }
82  digitalWrite(c0, HIGH);
83
84  digitalWrite(c1, LOW);
85  if (digitalRead(r0)  == 0) {
86    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
87    if  (layer == 1) Keyboard.press('1');
88  } else { Keyboard.release('q'); Keyboard.release('1');  }
89  if (digitalRead(r1) == 0) {
90    if (layer == 0) Keyboard.press ('a');
91    if (layer == 1) Keyboard.press(KEY_F1);
92    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
93  } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);  }
94  if (digitalRead(r2) == 0) {
95    if ((layer == 0) or (layer == 2)) Keyboard.press  ('z');
96    if (layer == 1) Keyboard.press(KEY_F12);
97  } else { Keyboard.release('z');  Keyboard.release(KEY_F12); }
98  if (digitalRead(r3) == 0) {
99    Keyboard.press(KEY_LEFT_GUI);
100  } else { Keyboard.release(KEY_LEFT_GUI); }
101  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
102
103  digitalWrite(c2, LOW);
104  if (digitalRead(r0) == 0) {
105    if (layer == 0)  Keyboard.press ('w');
106    if (layer == 1) Keyboard.press('2');
107    if (layer  == 2) Keyboard.press(KEY_UP_ARROW);
108  } else { Keyboard.release('w'); Keyboard.release('2');  Keyboard.release(KEY_UP_ARROW); }
109  if (digitalRead(r1) == 0) {
110    if (layer  == 0) Keyboard.press ('s');
111    if (layer == 1) Keyboard.press(KEY_F2);
112    if  (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
113  } else { Keyboard.release('s');  Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
114  if (digitalRead(r2)  == 0) {
115    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
116    if  (layer == 1) Keyboard.press(KEY_F13);
117  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);  }
118  if (digitalRead(r3) == 0) {
119    Keyboard.press(KEY_LEFT_ALT); //operating  system
120  } else { Keyboard.release(KEY_LEFT_ALT); }
121  digitalWrite(c2, HIGH);
122
123  digitalWrite(c3, LOW);
124  if (digitalRead(r0) == 0) {
125    if ((layer == 0)  or (layer == 2)) Keyboard.press ('e');
126    if (layer == 1) Keyboard.press('3');
127  } else { Keyboard.release('e'); Keyboard.release('3'); }
128  if (digitalRead(r1)  == 0) {
129    if (layer == 0) Keyboard.press ('d');
130    if (layer == 1) Keyboard.press(KEY_F3);
131    if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
132  } else { Keyboard.release('d');  Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
133  if (digitalRead(r2)  == 0) {
134    if ((layer == 0) or (layer == 2)) Keyboard.press ('c');
135    if  (layer == 1) Keyboard.press(KEY_F14);
136  } else { Keyboard.release('c'); Keyboard.release(KEY_F14);  }
137  digitalWrite(c3, HIGH);
138
139  digitalWrite(c4, LOW);
140  if (digitalRead(r0)  == 0) {
141    if ((layer == 0) or (layer == 2)) Keyboard.press ('r');
142    if  (layer == 1) Keyboard.press('4');
143  } else { Keyboard.release('r'); Keyboard.release('4');  }
144  if (digitalRead(r1) == 0) {
145    if ((layer == 0) or (layer == 2)) Keyboard.press  ('f');
146    if (layer == 1) Keyboard.press(KEY_F4);
147  } else { Keyboard.release('f');  Keyboard.release(KEY_F4); }
148  if (digitalRead(r2) == 0) {
149    if ((layer ==  0) or (layer == 2)) Keyboard.press ('v');
150    if (layer == 1) Keyboard.press(KEY_F15);
151  } else { Keyboard.release('v'); Keyboard.release(KEY_F15); }
152  if (digitalRead(r3)  == 0) {
153    Keyboard.press(' ');
154     delay(50);
155  } else { Keyboard.release('  '); }
156  digitalWrite(c4, HIGH);
157
158  digitalWrite(c5, LOW);
159  if (digitalRead(r0)  == 0) {
160    if ((layer == 0) or (layer == 2)) Keyboard.press ('t');
161    if  (layer == 1) Keyboard.press('5');
162  } else { Keyboard.release('t'); Keyboard.release('5');  }
163  if (digitalRead(r1) == 0) {
164    if ((layer == 0) or (layer == 2)) Keyboard.press  ('g');
165    if (layer == 1) Keyboard.press(KEY_F5);
166  } else { Keyboard.release('g');  Keyboard.release(KEY_F5); }
167  if (digitalRead(r2) == 0) {
168    if ((layer ==  0) or (layer == 2)) Keyboard.press ('b');
169    if (layer == 1) Keyboard.press(206);
170  } else { Keyboard.release('b'); Keyboard.release(206); } //prntscreen ascii 206
171  digitalWrite(c5, HIGH);
172
173  digitalWrite(c6, LOW);
174  if (digitalRead(r0)  == 0) {
175    if ((layer == 0) or (layer == 2)) Keyboard.press ('[');
176    if  (layer == 1) Keyboard.press('6');
177  } else { Keyboard.release('['); Keyboard.release('6');  }
178  if (digitalRead(r1) == 0) {
179    if ((layer == 0) or (layer == 2)) Keyboard.press  (';');
180    if (layer == 1) Keyboard.press(KEY_F6);
181  } else { Keyboard.release(';');  Keyboard.release(KEY_F6); }
182  if (digitalRead(r2) == 0) {
183    if ((layer ==  0) or (layer == 2)) Keyboard.press (',');
184    if (layer == 1) Keyboard.press(KEY_INSERT);
185  } else { Keyboard.release(','); Keyboard.release(KEY_INSERT); }
186  if (digitalRead(r3)  == 0) {
187    if (modeHold == false) {
188      if (layer == 0) {
189        layer  = 1;
190      } else if (layer == 1) {
191        layer = 2;
192      } else if  (layer == 2) { layer = 0; }
193      modeHold = true;
194    }
195  } else { modeHold  = false; }
196  digitalWrite(c6, HIGH);
197
198  digitalWrite(c7, LOW);
199  if  (digitalRead(r0) == 0) {
200    if ((layer == 0) or (layer == 2)) Keyboard.press  (']');
201    if (layer == 1) Keyboard.press('7');
202  } else { Keyboard.release(']');  Keyboard.release('7'); }
203  if (digitalRead(r1) == 0) {
204    if ((layer == 0)  or (layer == 2)) Keyboard.press ('\\''); // \\' meant for ' so more like " ' "
205    if (layer == 1) Keyboard.press(KEY_F7);
206  } else { Keyboard.release('\\'');  Keyboard.release(KEY_F7); }
207  if (digitalRead(r2) == 0) {
208    if ((layer ==  0) or (layer == 2)) Keyboard.press ('.');
209    if (layer == 1) Keyboard.press(KEY_HOME);
210  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME); }
211  digitalWrite(c7,  HIGH);
212
213  digitalWrite(c8, LOW);
214  if (digitalRead(r0) == 0) {
215    if  ((layer == 0) or (layer == 2)) Keyboard.press ('y');
216    if (layer == 1) Keyboard.press('8');
217  } else { Keyboard.release('y'); Keyboard.release('8'); }
218  if (digitalRead(r1)  == 0) {
219    if ((layer == 0) or (layer == 2)) Keyboard.press ('h');
220    if  (layer == 1) Keyboard.press(KEY_F8);
221  } else { Keyboard.release('h'); Keyboard.release(KEY_F8);  }
222  if (digitalRead(r2) == 0) {
223    if ((layer == 0) or (layer == 2)) Keyboard.press  ('n');
224    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
225  } else { Keyboard.release('n');  Keyboard.release(KEY_PAGE_UP); }
226  if (digitalRead(r3) == 0) { Keyboard.press('  ');  delay(50); } else { Keyboard.release(' '); }
227  digitalWrite(c8, HIGH);
228
229  digitalWrite(c9, LOW);
230  if (digitalRead(r0) == 0) {
231    if ((layer == 0)  or (layer == 2)) Keyboard.press ('u');
232    if (layer == 1) Keyboard.press('9');
233  } else { Keyboard.release('u'); Keyboard.release('9'); }
234  if (digitalRead(r1)  == 0) {
235    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
236    if  (layer == 1) Keyboard.press(KEY_F9);
237  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);  }
238  if (digitalRead(r2) == 0) {
239    if ((layer == 0) or (layer == 2)) Keyboard.press  ('m');
240    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
241  } else { Keyboard.release(KEY_PAGE_DOWN);  Keyboard.release('m'); }
242  digitalWrite(c9, HIGH);
243
244  digitalWrite(c10,  LOW);
245  if (digitalRead(r0) == 0) {
246    if ((layer == 0) or (layer == 2))  Keyboard.press ('i');
247    if (layer == 1) Keyboard.press('0');
248  } else {  Keyboard.release('i'); Keyboard.release('0'); }
249  if (digitalRead(r1) == 0) {
250    if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
251    if (layer ==  1) Keyboard.press(KEY_F10);
252  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);  }
253  if (digitalRead(r2) == 0) {
254    if ((layer == 0) or (layer == 2)) Keyboard.press  ('/');
255    if (layer == 1) Keyboard.press(KEY_END);
256  } else { Keyboard.release(KEY_END);  Keyboard.release('/'); }
257  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);  } else { Keyboard.release(KEY_RIGHT_ALT); }
258  digitalWrite(c10, HIGH);
259
260  digitalWrite(c11, LOW);
261  if (digitalRead(r0) == 0) {
262    if ((layer ==  0) or (layer == 2)) Keyboard.press ('o');
263    if (layer == 1) Keyboard.press('-');
264  } else { Keyboard.release('-'); Keyboard.release('o'); }
265  if (digitalRead(r1)  == 0) {
266    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
267    if  (layer == 1) Keyboard.press(KEY_F11);
268  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);  }//start A circut
269  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);  } else { Keyboard.release(KEY_RIGHT_SHIFT); }
270  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);  } else { Keyboard.release(KEY_RIGHT_GUI); }
271  digitalWrite(c11, HIGH);
272
273  digitalWrite(c12, LOW);
274  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==  0)) {
275    if ((layer == 0) or (layer == 2)) Keyboard.press('p');
276    if (layer  == 1) Keyboard.press('=');
277  } else { Keyboard.release('p'); Keyboard.release('=');  }
278  digitalWrite(c12, HIGH);
279
280  digitalWrite(c13, LOW);
281  if (digitalRead(r0)  == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);  }
282  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);  }
283  if (digitalRead(r2) == 0) {
284    if ((layer == 0) or (layer == 2)) Keyboard.press  ('`');
285    if (layer == 1) Keyboard.press(92);
286  } else { Keyboard.release(92);  Keyboard.release('`'); } // backslash ascii 92
287  if (digitalRead(r3) == 0) {  Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
288  digitalWrite(c13, HIGH);
289}
290

#include <Keyboard.h>

const int r0 = 2;
const int r1 = 3;
const  int r2 = 4;
const int r3 = 5;

const int c0 = 6;
const int c1 = 7;
const  int c2 = 8;
const int c3 = 9;
const int c4 = 10;
const int c5 = 11;
const  int c6 = 12;
const int c7 = 13;
const int c8 = 14;
const int c9 = 15;
const  int c10 = 16;
const int c11 = 17;
const int c12 = 18;
const int c13 = 19;

int  layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;  2 being gamr mode (replace wasd with arrows)
bool modeHold = false; //if you  are holding the mode button

void setup() {   
  pinMode(c0, OUTPUT);
  pinMode(c1, OUTPUT);
  pinMode(c2, OUTPUT);
  pinMode(c3, OUTPUT);
  pinMode(c4,  OUTPUT);
  pinMode(c5, OUTPUT);
  pinMode(c6, OUTPUT);
  pinMode(c7, OUTPUT);
  pinMode(c8, OUTPUT);
  pinMode(c9, OUTPUT);
  pinMode(c10, OUTPUT);
  pinMode(c11, OUTPUT);
  pinMode(c12, OUTPUT);
  pinMode(c13, OUTPUT);

  digitalWrite(c0, HIGH);
  digitalWrite(c1, HIGH);
  digitalWrite(c2, HIGH);
  digitalWrite(c3, HIGH);
  digitalWrite(c4, HIGH);
  digitalWrite(c5, HIGH);
  digitalWrite(c6, HIGH);
  digitalWrite(c7, HIGH);
  digitalWrite(c8, HIGH);
  digitalWrite(c9, HIGH);
  digitalWrite(c10, HIGH);
  digitalWrite(c11, HIGH);
  digitalWrite(c12, HIGH);
  digitalWrite(c13, HIGH);

  pinMode(r0, INPUT_PULLUP);
  pinMode(r1, INPUT_PULLUP);
  pinMode(r2, INPUT_PULLUP);
  pinMode(r3, INPUT_PULLUP);

  Keyboard.begin();
  
}

void loop() {
  
  digitalWrite(c0,  LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))  Keyboard.press(KEY_ESC);
    if (layer == 1) Keyboard.press(KEY_TAB);
  }  else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
  if (digitalRead(r1)  == 0) {
    Keyboard.press(KEY_CAPS_LOCK);
  } else { Keyboard.release(KEY_CAPS_LOCK);  }
  if (digitalRead(r2) == 0) {
    Keyboard.press(KEY_LEFT_SHIFT);
  }  else { Keyboard.release(KEY_LEFT_SHIFT); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_CTRL);
  } else { Keyboard.release(KEY_LEFT_CTRL);  }
  digitalWrite(c0, HIGH);

  digitalWrite(c1, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
    if  (layer == 1) Keyboard.press('1');
  } else { Keyboard.release('q'); Keyboard.release('1');  }
  if (digitalRead(r1) == 0) {
    if (layer == 0) Keyboard.press ('a');
    if (layer == 1) Keyboard.press(KEY_F1);
    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
  } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('z');
    if (layer == 1) Keyboard.press(KEY_F12);
  } else { Keyboard.release('z');  Keyboard.release(KEY_F12); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_GUI);
  } else { Keyboard.release(KEY_LEFT_GUI); }
  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

  digitalWrite(c2, LOW);
  if (digitalRead(r0) == 0) {
    if (layer == 0)  Keyboard.press ('w');
    if (layer == 1) Keyboard.press('2');
    if (layer  == 2) Keyboard.press(KEY_UP_ARROW);
  } else { Keyboard.release('w'); Keyboard.release('2');  Keyboard.release(KEY_UP_ARROW); }
  if (digitalRead(r1) == 0) {
    if (layer  == 0) Keyboard.press ('s');
    if (layer == 1) Keyboard.press(KEY_F2);
    if  (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
  } else { Keyboard.release('s');  Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
  if (digitalRead(r2)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
    if  (layer == 1) Keyboard.press(KEY_F13);
  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);  }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_ALT); //operating  system
  } else { Keyboard.release(KEY_LEFT_ALT); }
  digitalWrite(c2, HIGH);

  digitalWrite(c3, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('e');
    if (layer == 1) Keyboard.press('3');
  } else { Keyboard.release('e'); Keyboard.release('3'); }
  if (digitalRead(r1)  == 0) {
    if (layer == 0) Keyboard.press ('d');
    if (layer == 1) Keyboard.press(KEY_F3);
    if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
  } else { Keyboard.release('d');  Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
  if (digitalRead(r2)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('c');
    if  (layer == 1) Keyboard.press(KEY_F14);
  } else { Keyboard.release('c'); Keyboard.release(KEY_F14);  }
  digitalWrite(c3, HIGH);

  digitalWrite(c4, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('r');
    if  (layer == 1) Keyboard.press('4');
  } else { Keyboard.release('r'); Keyboard.release('4');  }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('f');
    if (layer == 1) Keyboard.press(KEY_F4);
  } else { Keyboard.release('f');  Keyboard.release(KEY_F4); }
  if (digitalRead(r2) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('v');
    if (layer == 1) Keyboard.press(KEY_F15);
  } else { Keyboard.release('v'); Keyboard.release(KEY_F15); }
  if (digitalRead(r3)  == 0) {
    Keyboard.press(' ');
     delay(50);
  } else { Keyboard.release('  '); }
  digitalWrite(c4, HIGH);

  digitalWrite(c5, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('t');
    if  (layer == 1) Keyboard.press('5');
  } else { Keyboard.release('t'); Keyboard.release('5');  }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('g');
    if (layer == 1) Keyboard.press(KEY_F5);
  } else { Keyboard.release('g');  Keyboard.release(KEY_F5); }
  if (digitalRead(r2) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('b');
    if (layer == 1) Keyboard.press(206);
  } else { Keyboard.release('b'); Keyboard.release(206); } //prntscreen ascii 206
  digitalWrite(c5, HIGH);

  digitalWrite(c6, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('[');
    if  (layer == 1) Keyboard.press('6');
  } else { Keyboard.release('['); Keyboard.release('6');  }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  (';');
    if (layer == 1) Keyboard.press(KEY_F6);
  } else { Keyboard.release(';');  Keyboard.release(KEY_F6); }
  if (digitalRead(r2) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press (',');
    if (layer == 1) Keyboard.press(KEY_INSERT);
  } else { Keyboard.release(','); Keyboard.release(KEY_INSERT); }
  if (digitalRead(r3)  == 0) {
    if (modeHold == false) {
      if (layer == 0) {
        layer  = 1;
      } else if (layer == 1) {
        layer = 2;
      } else if  (layer == 2) { layer = 0; }
      modeHold = true;
    }
  } else { modeHold  = false; }
  digitalWrite(c6, HIGH);

  digitalWrite(c7, LOW);
  if  (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  (']');
    if (layer == 1) Keyboard.press('7');
  } else { Keyboard.release(']');  Keyboard.release('7'); }
  if (digitalRead(r1) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('\\''); // \\' meant for ' so more like " ' "
    if (layer == 1) Keyboard.press(KEY_F7);
  } else { Keyboard.release('\\'');  Keyboard.release(KEY_F7); }
  if (digitalRead(r2) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('.');
    if (layer == 1) Keyboard.press(KEY_HOME);
  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME); }
  digitalWrite(c7,  HIGH);

  digitalWrite(c8, LOW);
  if (digitalRead(r0) == 0) {
    if  ((layer == 0) or (layer == 2)) Keyboard.press ('y');
    if (layer == 1) Keyboard.press('8');
  } else { Keyboard.release('y'); Keyboard.release('8'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('h');
    if  (layer == 1) Keyboard.press(KEY_F8);
  } else { Keyboard.release('h'); Keyboard.release(KEY_F8);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('n');
    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
  } else { Keyboard.release('n');  Keyboard.release(KEY_PAGE_UP); }
  if (digitalRead(r3) == 0) { Keyboard.press('  ');  delay(50); } else { Keyboard.release(' '); }
  digitalWrite(c8, HIGH);

  digitalWrite(c9, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('u');
    if (layer == 1) Keyboard.press('9');
  } else { Keyboard.release('u'); Keyboard.release('9'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
    if  (layer == 1) Keyboard.press(KEY_F9);
  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('m');
    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
  } else { Keyboard.release(KEY_PAGE_DOWN);  Keyboard.release('m'); }
  digitalWrite(c9, HIGH);

  digitalWrite(c10,  LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))  Keyboard.press ('i');
    if (layer == 1) Keyboard.press('0');
  } else {  Keyboard.release('i'); Keyboard.release('0'); }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
    if (layer ==  1) Keyboard.press(KEY_F10);
  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('/');
    if (layer == 1) Keyboard.press(KEY_END);
  } else { Keyboard.release(KEY_END);  Keyboard.release('/'); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);  } else { Keyboard.release(KEY_RIGHT_ALT); }
  digitalWrite(c10, HIGH);

  digitalWrite(c11, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('o');
    if (layer == 1) Keyboard.press('-');
  } else { Keyboard.release('-'); Keyboard.release('o'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
    if  (layer == 1) Keyboard.press(KEY_F11);
  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);  }//start A circut
  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);  } else { Keyboard.release(KEY_RIGHT_SHIFT); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);  } else { Keyboard.release(KEY_RIGHT_GUI); }
  digitalWrite(c11, HIGH);

  digitalWrite(c12, LOW);
  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==  0)) {
    if ((layer == 0) or (layer == 2)) Keyboard.press('p');
    if (layer  == 1) Keyboard.press('=');
  } else { Keyboard.release('p'); Keyboard.release('=');  }
  digitalWrite(c12, HIGH);

  digitalWrite(c13, LOW);
  if (digitalRead(r0)  == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);  }
  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('`');
    if (layer == 1) Keyboard.press(92);
  } else { Keyboard.release(92);  Keyboard.release('`'); } // backslash ascii 92
  if (digitalRead(r3) == 0) {  Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
  digitalWrite(c13, HIGH);
}

49KB.ino

c_cpp

The C++ File for the Arduino/PCB.

1#include <Keyboard.h>
2
3const int r0 = 2;
4const int r1 = 3;
5const  int r2 = 4;
6const int r3 = 5;
7
8const int c0 = 6;
9const int c1 = 7;
10const  int c2 = 8;
11const int c3 = 9;
12const int c4 = 10;
13const int c5 = 11;
14const  int c6 = 12;
15const int c7 = 13;
16const int c8 = 14;
17const int c9 = 15;
18const  int c10 = 16;
19const int c11 = 17;
20const int c12 = 18;
21const int c13 = 19;
22
23int  layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;  2 being gamr mode (replace wasd with arrows)
24bool modeHold = false; //if you  are holding the mode button
25
26void setup() {
27  pinMode(c0, OUTPUT);
28  pinMode(c1, OUTPUT);
29  pinMode(c2, OUTPUT);
30  pinMode(c3, OUTPUT);
31  pinMode(c4,  OUTPUT);
32  pinMode(c5, OUTPUT);
33  pinMode(c6, OUTPUT);
34  pinMode(c7, OUTPUT);
35  pinMode(c8, OUTPUT);
36  pinMode(c9, OUTPUT);
37  pinMode(c10, OUTPUT);
38  pinMode(c11, OUTPUT);
39  pinMode(c12, OUTPUT);
40  pinMode(c13, OUTPUT);
41
42  digitalWrite(c0, HIGH);
43  digitalWrite(c1, HIGH);
44  digitalWrite(c2, HIGH);
45  digitalWrite(c3, HIGH);
46  digitalWrite(c4, HIGH);
47  digitalWrite(c5, HIGH);
48  digitalWrite(c6, HIGH);
49  digitalWrite(c7, HIGH);
50  digitalWrite(c8, HIGH);
51  digitalWrite(c9, HIGH);
52  digitalWrite(c10, HIGH);
53  digitalWrite(c11, HIGH);
54  digitalWrite(c12, HIGH);
55  digitalWrite(c13, HIGH);
56
57  pinMode(r0, INPUT_PULLUP);
58  pinMode(r1, INPUT_PULLUP);
59  pinMode(r2, INPUT_PULLUP);
60  pinMode(r3, INPUT_PULLUP);
61
62  Keyboard.begin();
63  
64}
65
66void loop() {
67  
68  digitalWrite(c0,  LOW);
69  if (digitalRead(r0) == 0) {
70    if ((layer == 0) or (layer == 2))  Keyboard.press(KEY_ESC);
71    if (layer == 1) Keyboard.press(KEY_TAB);
72  }  else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
73  if (digitalRead(r1)  == 0) {
74    Keyboard.press(KEY_CAPS_LOCK);
75  } else { Keyboard.release(KEY_CAPS_LOCK);  }
76  if (digitalRead(r2) == 0) {
77    Keyboard.press(KEY_LEFT_SHIFT);
78  }  else { Keyboard.release(KEY_LEFT_SHIFT); }
79  if (digitalRead(r3) == 0) {
80    Keyboard.press(KEY_LEFT_CTRL);
81  } else { Keyboard.release(KEY_LEFT_CTRL);  }
82  digitalWrite(c0, HIGH);
83
84  digitalWrite(c1, LOW);
85  if (digitalRead(r0)  == 0) {
86    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
87    if  (layer == 1) Keyboard.press('1');
88  } else { Keyboard.release('q'); Keyboard.release('1');  }
89  if (digitalRead(r1) == 0) {
90    if (layer == 0) Keyboard.press ('a');
91    if (layer == 1) Keyboard.press(KEY_F1);
92    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
93  } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);  }
94  if (digitalRead(r2) == 0) {
95    if ((layer == 0) or (layer == 2)) Keyboard.press  ('z');
96    if (layer == 1) Keyboard.press(KEY_F12);
97  } else { Keyboard.release('z');  Keyboard.release(KEY_F12); }
98  if (digitalRead(r3) == 0) {
99    Keyboard.press(KEY_LEFT_GUI);
100  } else { Keyboard.release(KEY_LEFT_GUI); }
101  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
102
103  digitalWrite(c2, LOW);
104  if (digitalRead(r0) == 0) {
105    if (layer == 0)  Keyboard.press ('w');
106    if (layer == 1) Keyboard.press('2');
107    if (layer  == 2) Keyboard.press(KEY_UP_ARROW);
108  } else { Keyboard.release('w'); Keyboard.release('2');  Keyboard.release(KEY_UP_ARROW); }
109  if (digitalRead(r1) == 0) {
110    if (layer  == 0) Keyboard.press ('s');
111    if (layer == 1) Keyboard.press(KEY_F2);
112    if  (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
113  } else { Keyboard.release('a');  Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
114  if (digitalRead(r2)  == 0) {
115    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
116    if  (layer == 1) Keyboard.press(KEY_F13);
117  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);  }
118  if (digitalRead(r3) == 0) {
119    Keyboard.press(KEY_LEFT_ALT); //operating  system
120  } else { Keyboard.release(KEY_LEFT_ALT); }
121  digitalWrite(c2, HIGH);
122
123  digitalWrite(c3, LOW);
124  if (digitalRead(r0) == 0) {
125    if ((layer == 0)  or (layer == 2)) Keyboard.press ('e');
126    if (layer == 1) Keyboard.press('3');
127  } else { Keyboard.release('e'); Keyboard.release('3'); }
128  if (digitalRead(r1)  == 0) {
129    if (layer == 0) Keyboard.press ('d');
130    if (layer == 1) Keyboard.press(KEY_F3);
131    if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
132  } else { Keyboard.release('d');  Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
133  digitalWrite(c3,  LOW);
134  if (digitalRead(r0) == 0) {
135    if ((layer == 0) or (layer == 2))  Keyboard.press ('c');
136    if (layer == 1) Keyboard.press(KEY_F14);
137  } else  { Keyboard.release('c'); Keyboard.release(KEY_F14); }
138  digitalWrite(c3, HIGH);
139
140  digitalWrite(c4, LOW);
141  if (digitalRead(r0) == 0) {
142    if ((layer == 0)  or (layer == 2)) Keyboard.press ('r');
143    if (layer == 1) Keyboard.press('4');
144  } else { Keyboard.release('r'); Keyboard.release('4'); }
145  if (digitalRead(r1)  == 0) {
146    if ((layer == 0) or (layer == 2)) Keyboard.press ('f');
147    if  (layer == 1) Keyboard.press(KEY_F4);
148  } else { Keyboard.release('f'); Keyboard.release(KEY_F4);  }
149  if (digitalRead(r0) == 0) {
150    if ((layer == 0) or (layer == 2)) Keyboard.press  ('v');
151    if (layer == 1) Keyboard.press(KEY_F15);
152  } else { Keyboard.release('v');  Keyboard.release(KEY_F15); }
153  if (digitalRead(r3) == 0) {
154    Keyboard.press('  ');
155  } else { Keyboard.release(' '); }
156  digitalWrite(c4, HIGH);
157
158  digitalWrite(c5, LOW);
159  if (digitalRead(r0) == 0) {
160    if ((layer == 0)  or (layer == 2)) Keyboard.press ('t');
161    if (layer == 1) Keyboard.press('5');
162  } else { Keyboard.release('t'); Keyboard.release('5'); }
163  if (digitalRead(r1)  == 0) {
164    if ((layer == 0) or (layer == 2)) Keyboard.press ('g');
165    if  (layer == 1) Keyboard.press(KEY_F5);
166  } else { Keyboard.release('g'); Keyboard.release(KEY_F5);  }
167  if (digitalRead(r2) == 0) {
168    if ((layer == 0) or (layer == 2)) Keyboard.press  ('b');
169    if (layer == 1) Keyboard.press(206);
170  } else { Keyboard.release('b');  Keyboard.release(206); } //prntscreen ascii 206
171  digitalWrite(c5, HIGH);
172
173  digitalWrite(c6, LOW);
174  if (digitalRead(r0) == 0) {
175    if ((layer == 0)  or (layer == 2)) Keyboard.press ('[');
176    if (layer == 1) Keyboard.press('6');
177  } else { Keyboard.release('['); Keyboard.release('6'); }
178  if (digitalRead(r1)  == 0) {
179    if ((layer == 0) or (layer == 2)) Keyboard.press (';');
180    if  (layer == 1) Keyboard.press(KEY_F6);
181  } else { Keyboard.release(';'); Keyboard.release(KEY_F6);  }
182  if (digitalRead(r2) == 0) {
183    if ((layer == 0) or (layer == 2)) Keyboard.press  (',');
184    if (layer == 1) Keyboard.press(KEY_INSERT);
185  } else { Keyboard.release(',');  Keyboard.release(KEY_INSERT); }
186  if (digitalRead(r3) == 0) {
187    if (modeHold  == false) {
188      if (layer == 0) {
189        layer = 1;
190      } else if  (layer == 1) {
191        layer = 2;
192      } else if (layer == 2) { layer = 0;  }
193      modeHold = true;
194    }
195  } else { modeHold = false; }
196  digitalWrite(c6,  HIGH);
197
198  digitalWrite(c7, LOW);
199  if (digitalRead(r0) == 0) {
200    if  ((layer == 0) or (layer == 2)) Keyboard.press (']');
201    if (layer == 1) Keyboard.press('7');
202  } else { Keyboard.release(']'); Keyboard.release('7'); }
203  if (digitalRead(r1)  == 0) {
204    if ((layer == 0) or (layer == 2)) Keyboard.press ('\\''); // \\'  meant for ' so more like " ' "
205    if (layer == 1) Keyboard.press(KEY_F7);
206  } else { Keyboard.release('\\''); Keyboard.release(KEY_F7); }
207  if (digitalRead(r2)  == 0) {
208    if ((layer == 0) or (layer == 2)) Keyboard.press ('.');
209    if  (layer == 1) Keyboard.press(KEY_HOME);
210  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME);  }
211  digitalWrite(c7, HIGH);
212
213  digitalWrite(c8, LOW);
214  if (digitalRead(r0)  == 0) {
215    if ((layer == 0) or (layer == 2)) Keyboard.press ('y');
216    if  (layer == 1) Keyboard.press('8');
217  } else { Keyboard.release('y'); Keyboard.release('8');  }
218  if (digitalRead(r1) == 0) {
219    if ((layer == 0) or (layer == 2)) Keyboard.press  ('h');
220    if (layer == 1) Keyboard.press(KEY_F8);
221  } else { Keyboard.release('h');  Keyboard.release(KEY_F8); }
222  if (digitalRead(r2) == 0) {
223    if ((layer ==  0) or (layer == 2)) Keyboard.press ('n');
224    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
225  } else { Keyboard.release('n'); Keyboard.release(KEY_PAGE_UP); }
226  if (digitalRead(r2)  == 0) { Keyboard.press(' '); } else { Keyboard.release(' '); }
227  digitalWrite(c8,  HIGH);
228
229  digitalWrite(c9, LOW);
230  if (digitalRead(r0) == 0) {
231    if  ((layer == 0) or (layer == 2)) Keyboard.press ('u');
232    if (layer == 1) Keyboard.press('9');
233  } else { Keyboard.release('u'); Keyboard.release('9'); }
234  if (digitalRead(r1)  == 0) {
235    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
236    if  (layer == 1) Keyboard.press(KEY_F9);
237  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);  }
238  if (digitalRead(r2) == 0) {
239    if ((layer == 0) or (layer == 2)) Keyboard.press  ('m');
240    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
241  } else { Keyboard.release(KEY_PAGE_DOWN);  Keyboard.release('m'); }
242  digitalWrite(c9, HIGH);
243
244  digitalWrite(c10,  LOW);
245  if (digitalRead(r0) == 0) {
246    if ((layer == 0) or (layer == 2))  Keyboard.press ('i');
247    if (layer == 1) Keyboard.press('0');
248  } else {  Keyboard.release('i'); Keyboard.release('0'); }
249  if (digitalRead(r1) == 0) {
250    if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
251    if (layer ==  1) Keyboard.press(KEY_F10);
252  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);  }
253  if (digitalRead(r2) == 0) {
254    if ((layer == 0) or (layer == 2)) Keyboard.press  ('/');
255    if (layer == 1) Keyboard.press(KEY_END);
256  } else { Keyboard.release(KEY_END);  Keyboard.release('/'); }
257  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);  } else { Keyboard.release(KEY_RIGHT_ALT); }
258  digitalWrite(c10, HIGH);
259
260  digitalWrite(c11, LOW);
261  if (digitalRead(r0) == 0) {
262    if ((layer ==  0) or (layer == 2)) Keyboard.press ('o');
263    if (layer == 1) Keyboard.press('-');
264  } else { Keyboard.release('-'); Keyboard.release('o'); }
265  if (digitalRead(r1)  == 0) {
266    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
267    if  (layer == 1) Keyboard.press(KEY_F11);
268  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);  }//start A circut
269  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);  } else { Keyboard.release(KEY_RIGHT_SHIFT); }
270  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);  } else { Keyboard.release(KEY_RIGHT_GUI); }
271  digitalWrite(c11, HIGH);
272
273  digitalWrite(c12, LOW);
274  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==  0))
275  digitalWrite(c12, HIGH);
276
277  digitalWrite(c13, LOW);
278  if (digitalRead(r0)  == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);  }
279  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);  }
280  if (digitalRead(r2) == 0) {
281    if ((layer == 0) or (layer == 2)) Keyboard.press  ('`');
282    if (layer == 1) Keyboard.press(92);
283  } else { Keyboard.release(92);  Keyboard.release('`'); } // backslash ascii 92
284  if (digitalRead(r3) == 0) {  Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
285  digitalWrite(c13, HIGH);
286}
287

#include <Keyboard.h>

const int r0 = 2;
const int r1 = 3;
const  int r2 = 4;
const int r3 = 5;

const int c0 = 6;
const int c1 = 7;
const  int c2 = 8;
const int c3 = 9;
const int c4 = 10;
const int c5 = 11;
const  int c6 = 12;
const int c7 = 13;
const int c8 = 14;
const int c9 = 15;
const  int c10 = 16;
const int c11 = 17;
const int c12 = 18;
const int c13 = 19;

int  layer = 0; //which layer of characters. 0 being alpha; 1 being num, mods, f row;  2 being gamr mode (replace wasd with arrows)
bool modeHold = false; //if you  are holding the mode button

void setup() {
  pinMode(c0, OUTPUT);
  pinMode(c1, OUTPUT);
  pinMode(c2, OUTPUT);
  pinMode(c3, OUTPUT);
  pinMode(c4,  OUTPUT);
  pinMode(c5, OUTPUT);
  pinMode(c6, OUTPUT);
  pinMode(c7, OUTPUT);
  pinMode(c8, OUTPUT);
  pinMode(c9, OUTPUT);
  pinMode(c10, OUTPUT);
  pinMode(c11, OUTPUT);
  pinMode(c12, OUTPUT);
  pinMode(c13, OUTPUT);

  digitalWrite(c0, HIGH);
  digitalWrite(c1, HIGH);
  digitalWrite(c2, HIGH);
  digitalWrite(c3, HIGH);
  digitalWrite(c4, HIGH);
  digitalWrite(c5, HIGH);
  digitalWrite(c6, HIGH);
  digitalWrite(c7, HIGH);
  digitalWrite(c8, HIGH);
  digitalWrite(c9, HIGH);
  digitalWrite(c10, HIGH);
  digitalWrite(c11, HIGH);
  digitalWrite(c12, HIGH);
  digitalWrite(c13, HIGH);

  pinMode(r0, INPUT_PULLUP);
  pinMode(r1, INPUT_PULLUP);
  pinMode(r2, INPUT_PULLUP);
  pinMode(r3, INPUT_PULLUP);

  Keyboard.begin();
  
}

void loop() {
  
  digitalWrite(c0,  LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))  Keyboard.press(KEY_ESC);
    if (layer == 1) Keyboard.press(KEY_TAB);
  }  else { Keyboard.release(KEY_ESC); Keyboard.release(KEY_TAB); }
  if (digitalRead(r1)  == 0) {
    Keyboard.press(KEY_CAPS_LOCK);
  } else { Keyboard.release(KEY_CAPS_LOCK);  }
  if (digitalRead(r2) == 0) {
    Keyboard.press(KEY_LEFT_SHIFT);
  }  else { Keyboard.release(KEY_LEFT_SHIFT); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_CTRL);
  } else { Keyboard.release(KEY_LEFT_CTRL);  }
  digitalWrite(c0, HIGH);

  digitalWrite(c1, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('q');
    if  (layer == 1) Keyboard.press('1');
  } else { Keyboard.release('q'); Keyboard.release('1');  }
  if (digitalRead(r1) == 0) {
    if (layer == 0) Keyboard.press ('a');
    if (layer == 1) Keyboard.press(KEY_F1);
    if (layer == 2) Keyboard.press(KEY_LEFT_ARROW);
  } else { Keyboard.release('a'); Keyboard.release(KEY_F1); Keyboard.release(KEY_LEFT_ARROW);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('z');
    if (layer == 1) Keyboard.press(KEY_F12);
  } else { Keyboard.release('z');  Keyboard.release(KEY_F12); }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_GUI);
  } else { Keyboard.release(KEY_LEFT_GUI); }
  digitalWrite(c1, HIGH);                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

  digitalWrite(c2, LOW);
  if (digitalRead(r0) == 0) {
    if (layer == 0)  Keyboard.press ('w');
    if (layer == 1) Keyboard.press('2');
    if (layer  == 2) Keyboard.press(KEY_UP_ARROW);
  } else { Keyboard.release('w'); Keyboard.release('2');  Keyboard.release(KEY_UP_ARROW); }
  if (digitalRead(r1) == 0) {
    if (layer  == 0) Keyboard.press ('s');
    if (layer == 1) Keyboard.press(KEY_F2);
    if  (layer == 2) Keyboard.press(KEY_DOWN_ARROW);
  } else { Keyboard.release('a');  Keyboard.release(KEY_F2); Keyboard.release(KEY_DOWN_ARROW); }
  if (digitalRead(r2)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('x');
    if  (layer == 1) Keyboard.press(KEY_F13);
  } else { Keyboard.release('x'); Keyboard.release(KEY_F13);  }
  if (digitalRead(r3) == 0) {
    Keyboard.press(KEY_LEFT_ALT); //operating  system
  } else { Keyboard.release(KEY_LEFT_ALT); }
  digitalWrite(c2, HIGH);

  digitalWrite(c3, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('e');
    if (layer == 1) Keyboard.press('3');
  } else { Keyboard.release('e'); Keyboard.release('3'); }
  if (digitalRead(r1)  == 0) {
    if (layer == 0) Keyboard.press ('d');
    if (layer == 1) Keyboard.press(KEY_F3);
    if (layer == 2) Keyboard.press(KEY_RIGHT_ARROW);
  } else { Keyboard.release('d');  Keyboard.release(KEY_F3); Keyboard.release(KEY_RIGHT_ARROW); }
  digitalWrite(c3,  LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))  Keyboard.press ('c');
    if (layer == 1) Keyboard.press(KEY_F14);
  } else  { Keyboard.release('c'); Keyboard.release(KEY_F14); }
  digitalWrite(c3, HIGH);

  digitalWrite(c4, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('r');
    if (layer == 1) Keyboard.press('4');
  } else { Keyboard.release('r'); Keyboard.release('4'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('f');
    if  (layer == 1) Keyboard.press(KEY_F4);
  } else { Keyboard.release('f'); Keyboard.release(KEY_F4);  }
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('v');
    if (layer == 1) Keyboard.press(KEY_F15);
  } else { Keyboard.release('v');  Keyboard.release(KEY_F15); }
  if (digitalRead(r3) == 0) {
    Keyboard.press('  ');
  } else { Keyboard.release(' '); }
  digitalWrite(c4, HIGH);

  digitalWrite(c5, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('t');
    if (layer == 1) Keyboard.press('5');
  } else { Keyboard.release('t'); Keyboard.release('5'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('g');
    if  (layer == 1) Keyboard.press(KEY_F5);
  } else { Keyboard.release('g'); Keyboard.release(KEY_F5);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('b');
    if (layer == 1) Keyboard.press(206);
  } else { Keyboard.release('b');  Keyboard.release(206); } //prntscreen ascii 206
  digitalWrite(c5, HIGH);

  digitalWrite(c6, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0)  or (layer == 2)) Keyboard.press ('[');
    if (layer == 1) Keyboard.press('6');
  } else { Keyboard.release('['); Keyboard.release('6'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press (';');
    if  (layer == 1) Keyboard.press(KEY_F6);
  } else { Keyboard.release(';'); Keyboard.release(KEY_F6);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  (',');
    if (layer == 1) Keyboard.press(KEY_INSERT);
  } else { Keyboard.release(',');  Keyboard.release(KEY_INSERT); }
  if (digitalRead(r3) == 0) {
    if (modeHold  == false) {
      if (layer == 0) {
        layer = 1;
      } else if  (layer == 1) {
        layer = 2;
      } else if (layer == 2) { layer = 0;  }
      modeHold = true;
    }
  } else { modeHold = false; }
  digitalWrite(c6,  HIGH);

  digitalWrite(c7, LOW);
  if (digitalRead(r0) == 0) {
    if  ((layer == 0) or (layer == 2)) Keyboard.press (']');
    if (layer == 1) Keyboard.press('7');
  } else { Keyboard.release(']'); Keyboard.release('7'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('\\''); // \\'  meant for ' so more like " ' "
    if (layer == 1) Keyboard.press(KEY_F7);
  } else { Keyboard.release('\\''); Keyboard.release(KEY_F7); }
  if (digitalRead(r2)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('.');
    if  (layer == 1) Keyboard.press(KEY_HOME);
  } else { Keyboard.release('.'); Keyboard.release(KEY_HOME);  }
  digitalWrite(c7, HIGH);

  digitalWrite(c8, LOW);
  if (digitalRead(r0)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('y');
    if  (layer == 1) Keyboard.press('8');
  } else { Keyboard.release('y'); Keyboard.release('8');  }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('h');
    if (layer == 1) Keyboard.press(KEY_F8);
  } else { Keyboard.release('h');  Keyboard.release(KEY_F8); }
  if (digitalRead(r2) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('n');
    if (layer == 1) Keyboard.press(KEY_PAGE_UP);
  } else { Keyboard.release('n'); Keyboard.release(KEY_PAGE_UP); }
  if (digitalRead(r2)  == 0) { Keyboard.press(' '); } else { Keyboard.release(' '); }
  digitalWrite(c8,  HIGH);

  digitalWrite(c9, LOW);
  if (digitalRead(r0) == 0) {
    if  ((layer == 0) or (layer == 2)) Keyboard.press ('u');
    if (layer == 1) Keyboard.press('9');
  } else { Keyboard.release('u'); Keyboard.release('9'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('j');
    if  (layer == 1) Keyboard.press(KEY_F9);
  } else { Keyboard.release('j'); Keyboard.release(KEY_F9);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('m');
    if (layer == 1) Keyboard.press(KEY_PAGE_DOWN);
  } else { Keyboard.release(KEY_PAGE_DOWN);  Keyboard.release('m'); }
  digitalWrite(c9, HIGH);

  digitalWrite(c10,  LOW);
  if (digitalRead(r0) == 0) {
    if ((layer == 0) or (layer == 2))  Keyboard.press ('i');
    if (layer == 1) Keyboard.press('0');
  } else {  Keyboard.release('i'); Keyboard.release('0'); }
  if (digitalRead(r1) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('k');
    if (layer ==  1) Keyboard.press(KEY_F10);
  } else { Keyboard.release('k'); Keyboard.release(KEY_F10);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('/');
    if (layer == 1) Keyboard.press(KEY_END);
  } else { Keyboard.release(KEY_END);  Keyboard.release('/'); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_ALT);  } else { Keyboard.release(KEY_RIGHT_ALT); }
  digitalWrite(c10, HIGH);

  digitalWrite(c11, LOW);
  if (digitalRead(r0) == 0) {
    if ((layer ==  0) or (layer == 2)) Keyboard.press ('o');
    if (layer == 1) Keyboard.press('-');
  } else { Keyboard.release('-'); Keyboard.release('o'); }
  if (digitalRead(r1)  == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press ('l');
    if  (layer == 1) Keyboard.press(KEY_F11);
  } else { Keyboard.release('l'); Keyboard.release(KEY_F11);  }//start A circut
  if (digitalRead(r2) == 0) { Keyboard.press(KEY_RIGHT_SHIFT);  } else { Keyboard.release(KEY_RIGHT_SHIFT); }
  if (digitalRead(r3) == 0) { Keyboard.press(KEY_RIGHT_GUI);  } else { Keyboard.release(KEY_RIGHT_GUI); }
  digitalWrite(c11, HIGH);

  digitalWrite(c12, LOW);
  if ((digitalRead(r2) == 0) or (digitalRead(r3) ==  0))
  digitalWrite(c12, HIGH);

  digitalWrite(c13, LOW);
  if (digitalRead(r0)  == 0) { Keyboard.press(KEY_BACKSPACE); } else { Keyboard.release(KEY_BACKSPACE);  }
  if (digitalRead(r1) == 0) { Keyboard.press(KEY_RETURN); } else { Keyboard.release(KEY_RETURN);  }
  if (digitalRead(r2) == 0) {
    if ((layer == 0) or (layer == 2)) Keyboard.press  ('`');
    if (layer == 1) Keyboard.press(92);
  } else { Keyboard.release(92);  Keyboard.release('`'); } // backslash ascii 92
  if (digitalRead(r3) == 0) {  Keyboard.press(KEY_RIGHT_CTRL); } else { Keyboard.release(KEY_RIGHT_CTRL); }
  digitalWrite(c13, HIGH);
}

Downloadable files

Schematic

Gerber file

Schematic

Documentation

2_9bxNJoYq8s.stl

3_ewXLUtYG5v.stl

3d printed parts

part one of four. the first two are the case, the third and fourth are wrist rest.

3d printed parts

3_ewXLUtYG5v.stl

3d printed parts

part one of four. the first two are the case, the third and fourth are wrist rest.

3d printed parts

4_IDz9uQeXyP.stl

2_9bxNJoYq8s.stl

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