I have been actively trying to connect the 'Ultimate Breakout GPS v3' with an Ardunio UNO & have the BLYNK application running at the same time. I have a fully functional GPS module working in its own sketch and I also have a fully functional BLYNK app working in its own sketch. However, when I try to combine the code to have the GPS and BLYNK app working together, my GPS code gets stuck in a while loop. I think that it may have something to do with the Software Serial communication I am using for both the app and GPS module, but I am in college right now still new to learning these concepts. I can only think to attach the whole code so that you can see what is going on.
//Bluetooth/Blynk Definitions
#define BLYNK_USE_DIRECT_CONNECT
#define BLUETOOTH_TX_PIN 10
#define BLUETOOTH_RX_PIN 11
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
//#include <BlynkSimpleStream.h>
#include <BlynkSimpleSerialBLE.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_HMC5883_U.h>
//Cart GPS Definitions
#define GPS_TX_PIN 4
#define GPS_RX_PIN 5
char auth[] = "ruf1xsvCA3b-YPsR8CTGT2CgYwEYj78t";
//Serial Setups
SoftwareSerial bluetoothSerial(BLUETOOTH_TX_PIN, BLUETOOTH_RX_PIN); //(10,11)
SoftwareSerial cartSerial(GPS_TX_PIN, GPS_RX_PIN); //(4,5)
//Global Varibles
int x, y; //X,Y for Joystick Data
String NMEA1; //variable for first NMEA sentence
String NMEA2; //variable for second NMEA sentence
double cartLat, cartLon;
char c; //to read characters coming from GPS
struct GeoLoc {
float lat;
float lon;
};
GeoLoc cartLoc;
//Joystick
BLYNK_WRITE(V10) {
x = param[0].asInt(); // It extracts the x value of the Joystick inlcuded in the Mobile APP Blynk
y = param[1].asInt(); // It extracts the y value of the Joystick inlcuded in the Mobile APP Blynk
Serial.print("JoyX:"); Serial.println(x);
Serial.print("JoyY:"); Serial.println(y);
}
//User GPS
double userLon, userLat, userAlt, userSpeed;
BLYNK_WRITE(V11) {
GpsParam gps(param);
userLon = gps.getLon();
userLat = gps.getLat();
userAlt = gps.getAltitude();
userSpeed = gps.getSpeed();
Serial.print("userLat: "); Serial.println(userLat, 7);
Serial.print("userLon: "); Serial.println(userLon, 7);
cartLoc = getLocation();
Serial.print("cartLat: "); Serial.println(cartLoc.lat, 7);
Serial.print("cartLon: "); Serial.println(cartLoc.lon, 7);
}
//cartGPS
Adafruit_GPS cartGPS(&cartSerial);
void readCartGPS(){
Serial.print("Start of readCartGPS");
clearCartGPS();
Serial.print("Start of Whileloop");
while(!cartGPS.newNMEAreceived()){ //loop until we have a good NMEA sentence
c = cartGPS.read();
Serial.print("Inside");
}
cartGPS.parse(cartGPS.lastNMEA()); //parse last good NMEA sentence
NMEA1 = cartGPS.lastNMEA();
while(!cartGPS.newNMEAreceived()){ //loop until we have a good NMEA sentence
c = cartGPS.read();
}
cartGPS.parse(cartGPS.lastNMEA()); //parse last good NMEA sentence
NMEA2 = cartGPS.lastNMEA();
Serial.print("NMEA1:"); Serial.print(NMEA1);
Serial.print("NMEA2:"); Serial.println(NMEA2);
}
void clearCartGPS(){ //Clear old and corrupt data from Serial Port
Serial.print("Start of clearCartGPS");
while(!cartGPS.newNMEAreceived()){ //loop until we have a good NMEA sentence
c = cartGPS.read();
Serial.println("DEBUG: INSIDE WHILE");
}
cartGPS.parse(cartGPS.lastNMEA()); //parse last good NMEA sentence
while(!cartGPS.newNMEAreceived()){ //loop until we have a good NMEA sentence
c = cartGPS.read();
}
cartGPS.parse(cartGPS.lastNMEA()); //parse last good NMEA sentence
while(!cartGPS.newNMEAreceived()){ //loop until we have a good NMEA sentence
c = cartGPS.read();
}
cartGPS.parse(cartGPS.lastNMEA()); //parse last good NMEA sentence
}
GeoLoc getLocation(){
Serial.print("Start of GetLocation");
readCartGPS();
Serial.print("After readCartGPS is run");
delay(300);
cartLat = cartGPS.latitude;
char latDirection = cartGPS.lat;
if(latDirection == 'S'){
cartLat = -1 * cartLat;
}
cartLon = cartGPS.longitude;
char lonDirection = cartGPS.lon;
if(lonDirection == 'W'){
cartLon = -1 * cartLon;
}
cartLoc.lat = cartLat;
cartLoc.lon = cartLon;
// Serial.print("Cart Latitude: "); Serial.println(cartLat, 7);
// Serial.print("");
//
// Serial.print("Cart Longitude: "); Serial.println(cartLon, 7);
// Serial.print("");
return(cartLoc);
}
void setup() {
Serial.begin(4800);
cartGPS.begin(9600);
cartGPS.sendCommand("$PGCMD,33,0*6D"); //Turn off antenna update message
cartGPS.sendCommand(PMTK_SET_NMEA_UPDATE_10HZ); //Set update rate to 10Hz
cartGPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA); //Request RMC and GGA sentences only
bluetoothSerial.begin(9600);
Blynk.begin(bluetoothSerial, auth);
Serial.println("Test_Setup");
}
void loop() {
Blynk.run();
delay(100);
}
If I run this code on the Arduino, then my serial monitor will read the following: (Note that the BLYNK_WRITE(V11) is an interupt triggered when the GPS 'widget' in the BLYNK app updates)
Test_Setup
userLat: 42.1978645
userLon: -83.1744308
Start of GetLocation
Start of readCartGPS
Start of clearCartGPS
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
DEBUG: INSIDE WHILE
However, if I isolate only the code relating to the cartGPS, then the Serial Monitor will read:
NMEA1:$GPRMC,232347.000,A,4211.8708,N,08310.4676,W,0.08,78.84,091119,,,A*4D
NMEA2:$GPGGA,232348.000,4211.8708,N,08310.4675,W,1,08,1.06,171.9,M,-33.9,M,,*5C
Cart Latitude: 4211.8706054
Cart Longitude: -8310.4677734
NMEA1:$GPRMC,232350.000,A,4211.8707,N,08310.4676,W,0.06,164.81,091119,,,A*73
NMEA2:$GPGGA,232351.000,4211.8707,N,08310.4675,W,1,08,1.06,171.9,M,-33.9,M,,*5B
Cart Latitude: 4211.8706054
Cart Longitude: -8310.4677734
Which is expected.
