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Topic: Problem with my GPS (Read 967 times) previous topic - next topic


I recently bought a GPS module (vpn1513) in order to start working on my project which is building an autonomous guided vehicle. I can't wrap my head around this GPS module.
I tried to setup and program my GPS as mentioned in the following site


and the code I'm using :

Code: [Select]

#include <string.h>
#include <ctype.h>

int ledPin = 13;                  // LED test pin
int rxPin = 0;                    // RX PIN
int txPin = 1;                    // TX TX
int byteGPS=-1;
char linea[300] = "";
char comandoGPR[7] = "$GPRMC";
int cont=0;
int bien=0;
int conta=0;
int indices[13];

void setup() {
   pinMode(ledPin, OUTPUT);       // Initialize LED pin
   pinMode(rxPin, INPUT);
   pinMode(txPin, OUTPUT);
   for (int i=0;i<300;i++){       // Initialize a buffer for received data
     linea[i]=' ';

void loop() {
   digitalWrite(ledPin, HIGH);
   byteGPS=Serial.read();         // Read a byte of the serial port
   if (byteGPS == -1) {           // See if the port is empty yet
   } else {
     linea[conta]=byteGPS;        // If there is serial port data, it is put in the buffer
     Serial.print(byteGPS, BYTE);
     if (byteGPS==13){            // If the received byte is = to 13, end of transmission
       digitalWrite(ledPin, LOW);
       for (int i=1;i<7;i++){     // Verifies if the received command starts with $GPR
         if (linea[i]==comandoGPR[i-1]){
       if(bien==6){               // If yes, continue and process the data
         for (int i=0;i<300;i++){
           if (linea[i]==','){    // check for the position of the  "," separator
           if (linea[i]=='*'){    // ... and the "*"
         Serial.println("");      // ... and write to the serial port
         for (int i=0;i<12;i++){
             case 0 :Serial.print("Time in UTC (HhMmSs): ");break;
             case 1 :Serial.print("Status (A=OK,V=KO): ");break;
             case 2 :Serial.print("Latitude: ");break;
             case 3 :Serial.print("Direction (N/S): ");break;
             case 4 :Serial.print("Longitude: ");break;
             case 5 :Serial.print("Direction (E/W): ");break;
             case 6 :Serial.print("Velocity in knots: ");break;
             case 7 :Serial.print("Heading in degrees: ");break;
             case 8 :Serial.print("Date UTC (DdMmAa): ");break;
             case 9 :Serial.print("Magnetic degrees: ");break;
             case 10 :Serial.print("(E/W): ");break;
             case 11 :Serial.print("Mode: ");break;
             case 12 :Serial.print("Checksum: ");break;
           for (int j=indices[i];j<(indices[i+1]-1);j++){
       conta=0;                    // Reset the buffer
       for (int i=0;i<300;i++){    // 
         linea[i]=' ';             

The GPS light keeps blinking and all I see is nothing on the serial monitor. I tried changing the baud rate and different codes but I get the same problem, either I get a rubbish value or nothing at all.

Can somebody please tell me what I might be doing wrong?

here's how I have setup my GPS with arduino.


The GPS light keeps blinking and all I see is nothing on the serial monitor.

In that picture, you do not appear to be outside. That IS necessary.

Add a Serial.print() statement to print each character that is read from the GPS. Do you receive anything?

Never mind that. You appear to be trying to talk to the GPS and the PC on the same serial port. Forget it. That doesn't work.
The art of getting good answers lies in asking good questions.


I took it outside but still didn't work.. :(

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