Bonjour à tous,
J'ai acheté une carte GPS MTK3339, voici un lien pour les spécificités : https://cdn-reichelt.de/documents/datenblatt/A300/ADAFRUIT_746_ENG_TDS.pdf. J'ai pris cette carte car j'ai besoin, dans mon projet, de connaitre les coordonnées d'un petit satellite. Voici le code que j'ai mis dans la carte :
//
// This code shows how to listen to the GPS module in an interrupt
// which allows the program to have more 'freedom' - just parse
// when a new NMEA sentence is available! Then access data when
// desired.
//
// Tested and works great with the Adafruit Ultimate GPS module
// using MTK33x9 chipset
// ------> http://www.adafruit.com/products/746
// Pick one up today at the Adafruit electronics shop
// and help support open source hardware & software! -ada
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
// Connect the GPS Power pin to 5V
// Connect the GPS Ground pin to ground
// Connect the GPS TX (transmit) pin to Digital 8
// Connect the GPS RX (receive) pin to Digital 7
// you can change the pin numbers to match your wiring:
SoftwareSerial mySerial(8, 7);
Adafruit_GPS GPS(&mySerial);
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO true
void setup()
{
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
Serial.begin(115200);
delay(5000);
Serial.println("Adafruit GPS library basic parsing test!");
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
GPS.begin(9600);
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
// the parser doesn't care about other sentences at this time
// Set the update rate
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
// For the parsing code to work nicely and have time to sort thru the data, and
// print it out we don't suggest using anything higher than 1 Hz
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
delay(1000);
// Ask for firmware version
mySerial.println(PMTK_Q_RELEASE);
}
uint32_t timer = millis();
void loop() // run over and over again
{
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if ((c) && (GPSECHO))
Serial.write(c);
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trytng to print out data
//Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
}
// approximately every 2 seconds or so, print out the current stats
if (millis() - timer > 2000) {
timer = millis(); // reset the timer
Serial.print("\nTime: ");
if (GPS.hour < 10) { Serial.print('0'); }
Serial.print(GPS.hour, DEC); Serial.print(':');
if (GPS.minute < 10) { Serial.print('0'); }
Serial.print(GPS.minute, DEC); Serial.print(':');
if (GPS.seconds < 10) { Serial.print('0'); }
Serial.print(GPS.seconds, DEC); Serial.print('.');
if (GPS.milliseconds < 10) {
Serial.print("00");
} else if (GPS.milliseconds > 9 && GPS.milliseconds < 100) {
Serial.print("0");
}
Serial.println(GPS.milliseconds);
Serial.print("Date: ");
Serial.print(GPS.day, DEC); Serial.print('/');
Serial.print(GPS.month, DEC); Serial.print("/20");
Serial.println(GPS.year, DEC);
Serial.print("Fix: "); Serial.print((int)GPS.fix);
Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
if (GPS.fix) {
Serial.print("Location: ");
Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
Serial.print(", ");
Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
Serial.print("Speed (knots): "); Serial.println(GPS.speed);
Serial.print("Angle: "); Serial.println(GPS.angle);
Serial.print("Altitude: "); Serial.println(GPS.altitude);
Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
}
}
}
Les branchements sont ceux-ci :
-VIN -> 3,3V
-GND -> GND
-TX -> 8
-RX -> 7
J'arrive à téléverser le code sur la carte uno, j'ouvre le moniteur série, je le mets en 115200 baud, et là je reçois des données mais pas les coordonnées... Du style il y a dés zeros au lieu des coordonnées latitudes et longitudes.
Time: 23:59:46.798
Date: 5/1/2080
Fix: 0 quality: 0
$GPGGA,235947.799,,,,,0,00,,,M,,M,,*71
$GPRMC,235947.799,V,,,,,0.00,0.00,050180,,,N*48
$GPGGA,235948.799,,,,,0,00,,,M,,M,,*7E
$GPRMC,235948.799,V,,,,,0.00,0.00,050180,,,N*47
Time: 23:59:48.798
Date: 5/1/2080
Fix: 0 quality: 0
$GPGGA,235949.799,,,,,0,00,,,M,,M,,*7F
$GPRMC,235949.799,V,,,,,0.00,0.00,050180,,,N*46
$GPGGA,235950.799,,,,,0,00,,,M,,M,,*77
$GPRMC,235950.799,V,,,,,0.00,0.00,050180,,,N*4E
Time: 23:59:50.798
Date: 5/1/2080
Fix: 0 quality: 0
$GPGGA,235951.799,,,,,0,00,,,M,,M,,*76
$GPRMC,235951.799,V,,,,,0.00,0.00,050180,,,N*4F
$GPGGA,235952.800,,,,,0,00,,,M,,M,,*7A
$GPRMC,235952.800,V,,,,,0.00,0.00,050180,,,N*43
Time: 23:59:52.800
Date: 5/1/2080
Fix: 0 quality: 0
$GPGGA,235953.800,,,,,0,00,,,M,,M,,*7B
$GPRMC,235953.800,V,,,,,0.00,0.00,050180,,,N*42
$GPGGA,235954.800,,,,,0,00,,,M,,M,,*7C
$GPRMC,235954.800,V,,,,,0.00,0.00,050180,,,N*45
Voilà ce que je reçois. On voit qu'elle me donne l'heure (pas la bonne). Mais elle ne me donne pas les coordonnées... J'ai lu sur internet que ça devais certainement être le fait que je suis à l'intérieur et qu'elle ne capte pas bien les satellites. Je suis donc sorti mais malheureusement, je reçois toujours la même chose. Est-ce que quelqu'un pourrait me dire si il y a quelque chose de particulier à faire ? Ou est-ce peut-être la carte qui est cassée ? Ou peut-être que là où je vis la carte ne peut pas localiser les satellites ? Merci d'avance pour vos réponses, bonne fin de journée !
fallait être patient