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Topic: GPS (Read 686 times) previous topic - next topic

5ala

Ciao a tutti:
non sono certo un esperto di Arduino e sto cercando di far funzionare il programma di Tutorial GPS allegato senza risultato.
Ho un ricevitore GPS che funziona bene per altra applicazione (Motorola Oncore) con protocollo NMEA. Il segnale, ridotto a 5V, arriva al pin rx: lo vedo all'oscilloscopio.
Compiling OK; Uploading OK.
Ma nessun segno di vita.
Penso si arresti al primo "if"
Ma quando cerco di fare il "Copy for forum" dello sketch  si scatenano una serie di errori Java e questo รจ il risultato... :-[

Grazie ancora per il supporto.


/*
VEDI PLAYGROUND - GPS-
Example code for connecting a Parallax GPS module to the Arduino

Igor Gonz[ch65533]lez Mart[ch65533]n. 05-04-2007
igor.gonzalez.martin@gmail.com

English translation by djmatic 19-05-2007

Listen for the $GPRMC string and extract the GPS location data from this.
Display the result in the Arduino's serial monitor.

*/

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

int ledPin = 13;                  // LED test pin
int rxPin = 6;                    // RX PIN
int txPin = 7;                    // 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);
  Serial.begin(4800);
  for (int i=0;i<300;i++){       // Initialize a buffer for received data
    linea=' ';
  }  
}

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
    delay(1000);
   
  } else {
   
    linea[conta]=byteGPS;        // If there is serial port data, it is put in the buffer
   
    conta++;                      
    //printByte(byteGPS);  //  statement no more valida replaced by the following
   
    Serial.print(byteGPS);
   
    if (byteGPS==13){            // If the received byte is = to 13, end of transmission
      digitalWrite(ledPin, LOW);
      cont=0;
      bien=0;
      for (int i=1;i<7;i++){     // Verifies if the received command starts with $GPR
        if (linea==comandoGPR[i-1]){
          bien++;
        }
      }
      if(bien==6){               // If yes, continue and process the data
        for (int i=0;i<300;i++){
          if (linea==','){    // check for the position of the  "," separator
            indices[cont]=i;
            cont++;
          }
          if (linea=='*'){    // ... and the "*"
            indices[12]=i;
            cont++;
          }
        }
        Serial.println("");      // ... and write to the serial port
        Serial.println("");
        Serial.println("---------------");
        for (int i=0;i<12;i++){
          switch(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;j<(indices[i+1]-1);j++){
            Serial.print(linea[j+1]);
          }
          Serial.println("");
        }
        Serial.println("---------------");
      }
      conta=0;                    // Reset the buffer
      for (int i=0;i<300;i++){    //  
        linea=' ';            
      }                
    }
  }
}

/*If the above code works, in the serial monitor window you should see the following:


Valid position (status is A):


...
...

$GPGGA,154653,4428.2011,N,00440.5161,W,0,00,,-00044.7,M,051.6,M,,*6C
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,3,1,10,02,50,290,003,10,25,24,045,35,27,56,145,00,,,,,,,,*78
$GPRMC,154653,V,4428.2011,N,00440.5161,W,000.5,342.8,050407,,,N*7F  

---------------
Time in UTC (HhMmSs): 154653
Status (A=OK,V=KO): V
Latitude: 4428.2011
Direction (N/S): N
Longitude: 00440.5161
Direction (E/W): W
Speed in knots: 000.5
Direction in degrees: 342.8
Date in UTC (DdMmAa): 050407
Magnetic variation:  
Variation (E/W):  
Mode: A

---------------

...
...

B: Valid positon: The GPS light shines steadily.


...
...

$GPGGA,154654,4428.2011,N,00440.5161,W,0,00,,-00044.7,M,051.6,M,,*6B
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPGSV,3,1,10,02,50,290,00
$GPGGA,154655,4328.1874,N,00340.5185,W,1,03,08.5,-00044.7,M,051.6,M,,*79
$GPGSA,A,2,13,23,25,,,,,,,,,,08.5,08.5,00.9*0E
$GPGSV,3,1,10,02,50,290,26,04,60,210,26,08,33,173,29,10,21,296,00*7E
$GPGSV,3,2,10,13,58,044,34,16,03,035,00,20,02,109,00,23,26,057,34*7B
$GPGSV,3,3,10,25,24,045,35,27,56,145,27,,,,,,,,*7D
$GPRMC,154655,A,4428.1874,N,00440.5185,W,000.7,000.0,050407,,,A*6C  

---------------
Time in UTC (HhMmSs): 154655
Status (A=OK,V=KO): A
Latitude: 4428.1874
Direction (N/S): N
Longitude: 00440.5185
Direction (E/W): W
Speed in Knots: 000.7
Heading in degrees: 000.0
Date in UTC (DdMmAa): 050407
Magnetic variation:  
Variation (E/W):  
Mode: A
---------------

...
...
*/

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