DIY GPS Speedcoach

Designed for crew rowing, this speedcoach is designed to track split times and total meters traveled.

Jun 13, 2019

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6 respects

tracking

data collection

monitoring

Components and supplies

Battery, 3.7 V

Directional Antenna, GNSS Active Patch Antenna with LNA

Pushbutton Switch, Momentary

Adafruit Ultimate GPS FeatherWing

Any Feather microcontroller

Adafruit Ultimate GPS Breakout

SSD1306 128x64 OLED Display

Arduino Nano R3

Tools and machines

Soldering iron (generic)

Project description

Code

Code (GPSSP)

arduino

Main code for the speedcoach.

1#include <Adafruit_SSD1306.h>
2#include <splash.h>
3#include <Wire.h>
4#include  <Adafruit_GFX.h>
5#include <SPI.h>
6#include <SandTimer.h>
7#include <SD.h>
8#include  <millisDelay.h>
9#include <Adafruit_GPS.h>   //Libraries
10#define GPSSerial  Serial1
11#define SCREEN_WIDTH 128
12#define SCREEN_HEIGHT 64
13#define OLED_RESET  -1
14#define PAUSE 1000
15Adafruit_GPS GPS(&GPSSerial);
16File myFile;
17SandTimer  timer1;
18#define GPSECHO false
19Adafruit_SSD1306 display(SCREEN_WIDTH,SCREEN_HEIGHT,&Wire,OLED_RESET);
20uint32_t  timer = millis();
21const int chipSelect = 4;
22float ms = 0; //Meters/Second  variable
23float avems = 0;  //Average M/S variable
24float mscounter = 0;  //Speed  total (for average)
25int integcounter = 0; //Counts half-seconds
26float meterstraveled  = 0; //Total meters
27int splittotal = 0;   //Split total (in seconds)  (Essential  to be an integer)
28int splitseconds = 0; //Seconds on split display  (Essential  to be an integer)
29int splitminutes = 0; //Minutes on split display  (Essential  to be an integer)
30int seconds = 0;
31int minutes = 0;
32int hours = 0;    //Self-explanatory  (for timers)
33int splitaveragetotal = 0; //All split seconds added together (for  average split)
34int splitaverageseconds = 0; //Split average seconds
35int splitaverageminutes  = 0; //Split average minutes
36int splitaverage = 0; //Split average
37int splitaveragesecondsdisp  = 0; //Display variables, fixes a bug
38int splitaverageminutesdisp = 0; 
39int  splitmdisp = 0; 
40int splitsdisp = 0;  //Display Variables
41int tc = 0; //Counter  variable
42int dp = 0; //Data-point variable
43int dpave = 0; //Average of the  data-points
44int dprec = 0; //Counter variable
45float knot = 0;//Speed in knots  recorded from GPS
46float aveknots = 0;  //Speed in knots averaged over 1/2 second  (equal to 1 data point and 5 knot readings)
47int knotcounter = 0; //Counter variable
48int  sensorValue = analogRead(A3); //For the data write switch
49float msfm = 0; //M/S  for the meters calculation
50float checkBattery(){
51  //Function to check battery  voltage
52  float measuredvbat = analogRead(9);
53  measuredvbat *= 2;    // we  divided by 2, so multiply back
54  measuredvbat *= 3.3;  // Multiply by 3.3V, our  reference voltage
55  measuredvbat /= 1024; // convert to voltage
56
57  
58  return measuredvbat;}
59  millisDelay secdelay;   //Timing delay (for timer)
60void  setup() {
61  float voltage = sensorValue * (5.0 / 1023.0);   //Converts A3 reading  into a 5v equivalent
62  Wire.begin();
63  Wire.setClock(400000L);
64   Serial.begin(115200);
65    GPS.begin(9600);
66GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);   
67GPS.sendCommand(PGCMD_ANTENNA);   
68GPSSerial.println(PMTK_Q_RELEASE);
69int realhours = GPS.hour - 8;
70if(realhours  < 0) {realhours = realhours+24;} //For SD timestamp (24 hour format)
71if (voltage  == 5) {if (!SD.begin(chipSelect)) { //Begins SD card startup
72    Serial.println("Card  failed, or not present");
73    }
74  }
75  uint32_t m = micros();  //Main timer  initialization
76display.begin(SSD1306_SWITCHCAPVCC,0x3C);
77display.fillScreen(0);
78display.display();
79display.fillRect(0,26,26,8,1);
80  display.fillTriangle(20,32,24,32,24,55,1);
81  display.fillTriangle(20,26,80,13,80,26,1);
82  display.fillTriangle(80,13,100,26,80,26,1);
83  display.fillRect(25,26,76,31,1);
84  display.fillTriangle(80,64,128,40,128,64,0);
85  display.setCursor(32,25);
86  display.setTextColor(0);
87  display.setTextSize(4);
88  display.print("RTI");
89  display.setCursor(0,0);
90  display.setTextColor(1);
91  display.setTextSize(1);
92  display.print("RTI Development");
93  display.setCursor(0,8);
94  display.print("v.  3.0.0");
95  display.display();
96  delay(2000);
97  secdelay.start(1000); //Start  secondary timer delay (1 Second)
98File dataFile = SD.open("storage.txt", FILE_WRITE);   //Opens SD card, prints initial piece introduction + timestamp
99   if (dataFile)  {
100    Serial.println("Writing to SD");
101    dataFile.println("PIECE BEGIN  - - -");
102    dataFile.print(realhours);
103    dataFile.print("/");
104    dataFile.println(GPS.minute);
105    dataFile.close();}
106    timer1.start(100);
107
108}
109
110void loop() {
111
112  sensorValue = analogRead(A3);
113  float voltage = sensorValue * (5.0 / 1023.0);
114
115  float batVoltage = checkBattery();  //get battery voltage
116  if (secdelay.justFinished())  {seconds++; secdelay.repeat();} //Checks if 1 second has passed, updates seconds  variable
117  if (seconds == 60) {seconds = 0; minutes++;}                 //Checks  if 60 seconds have passed, resets seconds, increases minutes
118  if (minutes ==  60) {minutes = 0; hours++;}                   //Checks if 60 minutes have passed,  resets minutes, increases hours
119  char c = GPS.read();
120  if (GPSECHO)
121    if (c) Serial.print(c);
122  if (GPS.newNMEAreceived()) {
123    Serial.println(GPS.lastNMEA());  
124    if (!GPS.parse(GPS.lastNMEA()));  //Serial GPS info for debugging
125  }
126  
127  if (timer > millis()) timer = millis();   //Restarts main timer
128  
129    
130    if (timer1.finished()) {knot = knot+GPS.speed; knotcounter++;
131    timer1.startOver();}  
132  
133  if (millis() - timer > 500) {   //Runs every half-second (responsible  for screen-flicker)
134    timer = millis(); // Resets timer
135     if (GPS.fix)  {
136      aveknots = knot/knotcounter;
137      Serial.println(aveknots);
138      ms  = (aveknots*0.5144444); //Converts knots to meters/second
139      Serial.println(ms);
140      knot = 0;
141      tc = 0;
142      knotcounter = 0;
143      aveknots = 0;
144      if (ms <= 0.75) {display.fillScreen(0);
145                       
146                       display.setCursor(0,0);
147                       display.setTextColor(1);
148                       display.setTextSize(1);
149                       
150                       display.print("Error: IDLE");
151                       display.setCursor(0,15);
152                       display.print("T:  "); 
153                       display.setCursor(10,15);
154                       display.print(hours);  
155                       display.setCursor(16,15);
156                       display.print(":");  
157                       display.setCursor(22,15);
158                       display.print(minutes);  
159                       display.setCursor(34,15);
160                       display.print(":");  
161                       display.setCursor(40,15);
162                       display.print(seconds);
163                       display.setCursor(0,30);
164                       display.print("Battery:  ");
165                       display.setCursor(47,30);
166                       display.print(batVoltage);
167                       display.setCursor(0,45);
168                       display.print("Meters:  ");
169                       display.setCursor(43,45);
170                       display.print(meterstraveled);  }//Idle screen 
171                       display.display();
172                   
173                   
174     if (ms > 0.75) 
175      {
176       
177      msfm  = ms;
178      mscounter = (mscounter+msfm);  //Continually adds speed to total  (for averages)
179      integcounter = (integcounter+1); //Adds +1 to variable every  half second (for averages)
180      avems = mscounter/integcounter; //Generates  average meters/second (for total)
181      meterstraveled = avems*(integcounter/2);  //Calculates total (meters/second divided by seconds)
182      splittotal = 500/(ms);  //Generates seconds per 500m
183      dp = dp + splittotal;  //Adds data-points  for dpave variable
184      dprec++;
185      if (dprec >= 6) {dpave = dp/6; //Calculates  average
186                       dprec = 0; 
187                       dp = 0;  //Resets data-points and counter variable
188                       if(voltage >  4.5) {File dataFile = SD.open("storage.txt", FILE_WRITE);
189                       //Opens  SD card if write switch is on
190
191  if (dataFile) {
192    Serial.println("Writing  to SD");
193    dataFile.println("S: ");
194    dataFile.print(splitminutes);
195    dataFile.print(":");
196    dataFile.println(splitseconds);
197    dataFile.print("Ave.  S ");
198    dataFile.print(splitaverageminutes); 
199    dataFile.print(":");
200    dataFile.println(splitaverageseconds);
201    dataFile.print("M: ");
202    dataFile.println(meterstraveled);
203    dataFile.print(hours);
204    dataFile.print(":");
205    dataFile.print(minutes);
206    dataFile.print(":");
207    dataFile.println(seconds);
208    dataFile.println();
209    dataFile.close();}}   //Prints data to SD card
210    }
211      splitminutes  = dpave/60; //Generates split minutes from split seconds 
212      splitseconds  = dpave - (splitminutes*60); //Displays remaining seconds
213      splitaveragetotal  = splitaveragetotal+splittotal;   //All split times (in seconds) added together
214      splitaverage = splitaveragetotal/(integcounter);  //Averages out split times  w/ seconds
215      splitaverageminutes = splitaverage/60;   //Calculates split  minutes
216      splitaverageseconds = splitaverage-splitaverageminutes*60;   //Calculates  split seconds
217      splitaverageminutesdisp = splitaverageminutes;
218      splitaveragesecondsdisp  = splitaverageseconds;
219      splitmdisp = splitminutes;
220      splitsdisp =  splitseconds;      //Display variables
221      display.fillScreen(0);
222      display.setCursor(0,0);
223      display.setTextColor(1);
224      display.setTextSize(2);
225      display.print("M:  "); 
226      display.setCursor(20,0);
227      display.print(meterstraveled);  //Displays total meters
228      display.setCursor(0,20);
229      display.print("S:  "); 
230      display.setCursor(20,20);
231      display.print(splitmdisp);
232      display.setCursor(35,20); 
233      display.print(":"); 
234      display.setCursor(45,20);
235      display.print(splitsdisp); 
236      //oled.print("   AS: "); oled.print(splitaverageminutesdisp);  oled.print(":");  oled.println(splitaveragesecondsdisp);
237        //Displays  split and average split
238      display.setCursor(0,40);
239      display.print("T:  "); 
240      display.setCursor(22,40);
241      display.print(hours); 
242      display.setCursor(33,40);
243      display.print(":"); 
244      display.setCursor(42,40);
245      display.print(59);  
246      display.setCursor(63,40);
247      display.print(":"); 
248      display.setCursor(72,40);
249      display.print(seconds); //Displays timer
250      display.display();
251      //if  (voltage >= 4.5) {oled.print("SD Write ON");}
252      //if (voltage < 4.5) {oled.print("SD  Write OFF");} //Shows write permission status
253      }}}}
254

#include <Adafruit_SSD1306.h>
#include <splash.h>
#include <Wire.h>
#include  <Adafruit_GFX.h>
#include <SPI.h>
#include <SandTimer.h>
#include <SD.h>
#include  <millisDelay.h>
#include <Adafruit_GPS.h>   //Libraries
#define GPSSerial  Serial1
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET  -1
#define PAUSE 1000
Adafruit_GPS GPS(&GPSSerial);
File myFile;
SandTimer  timer1;
#define GPSECHO false
Adafruit_SSD1306 display(SCREEN_WIDTH,SCREEN_HEIGHT,&Wire,OLED_RESET);
uint32_t  timer = millis();
const int chipSelect = 4;
float ms = 0; //Meters/Second  variable
float avems = 0;  //Average M/S variable
float mscounter = 0;  //Speed  total (for average)
int integcounter = 0; //Counts half-seconds
float meterstraveled  = 0; //Total meters
int splittotal = 0;   //Split total (in seconds)  (Essential  to be an integer)
int splitseconds = 0; //Seconds on split display  (Essential  to be an integer)
int splitminutes = 0; //Minutes on split display  (Essential  to be an integer)
int seconds = 0;
int minutes = 0;
int hours = 0;    //Self-explanatory  (for timers)
int splitaveragetotal = 0; //All split seconds added together (for  average split)
int splitaverageseconds = 0; //Split average seconds
int splitaverageminutes  = 0; //Split average minutes
int splitaverage = 0; //Split average
int splitaveragesecondsdisp  = 0; //Display variables, fixes a bug
int splitaverageminutesdisp = 0; 
int  splitmdisp = 0; 
int splitsdisp = 0;  //Display Variables
int tc = 0; //Counter  variable
int dp = 0; //Data-point variable
int dpave = 0; //Average of the  data-points
int dprec = 0; //Counter variable
float knot = 0;//Speed in knots  recorded from GPS
float aveknots = 0;  //Speed in knots averaged over 1/2 second  (equal to 1 data point and 5 knot readings)
int knotcounter = 0; //Counter variable
int  sensorValue = analogRead(A3); //For the data write switch
float msfm = 0; //M/S  for the meters calculation
float checkBattery(){
  //Function to check battery  voltage
  float measuredvbat = analogRead(9);
  measuredvbat *= 2;    // we  divided by 2, so multiply back
  measuredvbat *= 3.3;  // Multiply by 3.3V, our  reference voltage
  measuredvbat /= 1024; // convert to voltage

  
  return measuredvbat;}
  millisDelay secdelay;   //Timing delay (for timer)
void  setup() {
  float voltage = sensorValue * (5.0 / 1023.0);   //Converts A3 reading  into a 5v equivalent
  Wire.begin();
  Wire.setClock(400000L);
   Serial.begin(115200);
    GPS.begin(9600);
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);   
GPS.sendCommand(PGCMD_ANTENNA);   
GPSSerial.println(PMTK_Q_RELEASE);
int realhours = GPS.hour - 8;
if(realhours  < 0) {realhours = realhours+24;} //For SD timestamp (24 hour format)
if (voltage  == 5) {if (!SD.begin(chipSelect)) { //Begins SD card startup
    Serial.println("Card  failed, or not present");
    }
  }
  uint32_t m = micros();  //Main timer  initialization
display.begin(SSD1306_SWITCHCAPVCC,0x3C);
display.fillScreen(0);
display.display();
display.fillRect(0,26,26,8,1);
  display.fillTriangle(20,32,24,32,24,55,1);
  display.fillTriangle(20,26,80,13,80,26,1);
  display.fillTriangle(80,13,100,26,80,26,1);
  display.fillRect(25,26,76,31,1);
  display.fillTriangle(80,64,128,40,128,64,0);
  display.setCursor(32,25);
  display.setTextColor(0);
  display.setTextSize(4);
  display.print("RTI");
  display.setCursor(0,0);
  display.setTextColor(1);
  display.setTextSize(1);
  display.print("RTI Development");
  display.setCursor(0,8);
  display.print("v.  3.0.0");
  display.display();
  delay(2000);
  secdelay.start(1000); //Start  secondary timer delay (1 Second)
File dataFile = SD.open("storage.txt", FILE_WRITE);   //Opens SD card, prints initial piece introduction + timestamp
   if (dataFile)  {
    Serial.println("Writing to SD");
    dataFile.println("PIECE BEGIN  - - -");
    dataFile.print(realhours);
    dataFile.print("/");
    dataFile.println(GPS.minute);
    dataFile.close();}
    timer1.start(100);

}

void loop() {

  sensorValue = analogRead(A3);
  float voltage = sensorValue * (5.0 / 1023.0);

  float batVoltage = checkBattery();  //get battery voltage
  if (secdelay.justFinished())  {seconds++; secdelay.repeat();} //Checks if 1 second has passed, updates seconds  variable
  if (seconds == 60) {seconds = 0; minutes++;}                 //Checks  if 60 seconds have passed, resets seconds, increases minutes
  if (minutes ==  60) {minutes = 0; hours++;}                   //Checks if 60 minutes have passed,  resets minutes, increases hours
  char c = GPS.read();
  if (GPSECHO)
    if (c) Serial.print(c);
  if (GPS.newNMEAreceived()) {
    Serial.println(GPS.lastNMEA());  
    if (!GPS.parse(GPS.lastNMEA()));  //Serial GPS info for debugging
  }
  
  if (timer > millis()) timer = millis();   //Restarts main timer
  
    
    if (timer1.finished()) {knot = knot+GPS.speed; knotcounter++;
    timer1.startOver();}  
  
  if (millis() - timer > 500) {   //Runs every half-second (responsible  for screen-flicker)
    timer = millis(); // Resets timer
     if (GPS.fix)  {
      aveknots = knot/knotcounter;
      Serial.println(aveknots);
      ms  = (aveknots*0.5144444); //Converts knots to meters/second
      Serial.println(ms);
      knot = 0;
      tc = 0;
      knotcounter = 0;
      aveknots = 0;
      if (ms <= 0.75) {display.fillScreen(0);
                       
                       display.setCursor(0,0);
                       display.setTextColor(1);
                       display.setTextSize(1);
                       
                       display.print("Error: IDLE");
                       display.setCursor(0,15);
                       display.print("T:  "); 
                       display.setCursor(10,15);
                       display.print(hours);  
                       display.setCursor(16,15);
                       display.print(":");  
                       display.setCursor(22,15);
                       display.print(minutes);  
                       display.setCursor(34,15);
                       display.print(":");  
                       display.setCursor(40,15);
                       display.print(seconds);
                       display.setCursor(0,30);
                       display.print("Battery:  ");
                       display.setCursor(47,30);
                       display.print(batVoltage);
                       display.setCursor(0,45);
                       display.print("Meters:  ");
                       display.setCursor(43,45);
                       display.print(meterstraveled);  }//Idle screen 
                       display.display();
                   
                   
     if (ms > 0.75) 
      {
       
      msfm  = ms;
      mscounter = (mscounter+msfm);  //Continually adds speed to total  (for averages)
      integcounter = (integcounter+1); //Adds +1 to variable every  half second (for averages)
      avems = mscounter/integcounter; //Generates  average meters/second (for total)
      meterstraveled = avems*(integcounter/2);  //Calculates total (meters/second divided by seconds)
      splittotal = 500/(ms);  //Generates seconds per 500m
      dp = dp + splittotal;  //Adds data-points  for dpave variable
      dprec++;
      if (dprec >= 6) {dpave = dp/6; //Calculates  average
                       dprec = 0; 
                       dp = 0;  //Resets data-points and counter variable
                       if(voltage >  4.5) {File dataFile = SD.open("storage.txt", FILE_WRITE);
                       //Opens  SD card if write switch is on

  if (dataFile) {
    Serial.println("Writing  to SD");
    dataFile.println("S: ");
    dataFile.print(splitminutes);
    dataFile.print(":");
    dataFile.println(splitseconds);
    dataFile.print("Ave.  S ");
    dataFile.print(splitaverageminutes); 
    dataFile.print(":");
    dataFile.println(splitaverageseconds);
    dataFile.print("M: ");
    dataFile.println(meterstraveled);
    dataFile.print(hours);
    dataFile.print(":");
    dataFile.print(minutes);
    dataFile.print(":");
    dataFile.println(seconds);
    dataFile.println();
    dataFile.close();}}   //Prints data to SD card
    }
      splitminutes  = dpave/60; //Generates split minutes from split seconds 
      splitseconds  = dpave - (splitminutes*60); //Displays remaining seconds
      splitaveragetotal  = splitaveragetotal+splittotal;   //All split times (in seconds) added together
      splitaverage = splitaveragetotal/(integcounter);  //Averages out split times  w/ seconds
      splitaverageminutes = splitaverage/60;   //Calculates split  minutes
      splitaverageseconds = splitaverage-splitaverageminutes*60;   //Calculates  split seconds
      splitaverageminutesdisp = splitaverageminutes;
      splitaveragesecondsdisp  = splitaverageseconds;
      splitmdisp = splitminutes;
      splitsdisp =  splitseconds;      //Display variables
      display.fillScreen(0);
      display.setCursor(0,0);
      display.setTextColor(1);
      display.setTextSize(2);
      display.print("M:  "); 
      display.setCursor(20,0);
      display.print(meterstraveled);  //Displays total meters
      display.setCursor(0,20);
      display.print("S:  "); 
      display.setCursor(20,20);
      display.print(splitmdisp);
      display.setCursor(35,20); 
      display.print(":"); 
      display.setCursor(45,20);
      display.print(splitsdisp); 
      //oled.print("   AS: "); oled.print(splitaverageminutesdisp);  oled.print(":");  oled.println(splitaveragesecondsdisp);
        //Displays  split and average split
      display.setCursor(0,40);
      display.print("T:  "); 
      display.setCursor(22,40);
      display.print(hours); 
      display.setCursor(33,40);
      display.print(":"); 
      display.setCursor(42,40);
      display.print(59);  
      display.setCursor(63,40);
      display.print(":"); 
      display.setCursor(72,40);
      display.print(seconds); //Displays timer
      display.display();
      //if  (voltage >= 4.5) {oled.print("SD Write ON");}
      //if (voltage < 4.5) {oled.print("SD  Write OFF");} //Shows write permission status
      }}}}

Downloadable files

Schematics

Wire Diagram for the GPSSP

Schematics

Wire Diagram for the GPSSP

Schematics

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