I've synced my Uno with the Arduino IDE and I'm using the below code to get the GPS coordinates.
// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver // // 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> // If you're using a GPS module: // Connect the GPS Power pin to 5V // Connect the GPS Ground pin to ground // If using software serial (sketch example default): // Connect the GPS TX (transmit) pin to Digital 3 // Connect the GPS RX (receive) pin to Digital 2 // If using hardware serial (e.g. Arduino Mega): // Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3 // Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3 // If you're using the Adafruit GPS shield, change // SoftwareSerial mySerial(3, 2); -> SoftwareSerial mySerial(8, 7); // and make sure the switch is set to SoftSerial // If using software serial, keep this line enabled // (you can change the pin numbers to match your wiring): SoftwareSerial mySerial(3, 2); // If using hardware serial (e.g. Arduino Mega), comment out the // above SoftwareSerial line, and enable this line instead // (you can change the Serial number to match your wiring): //HardwareSerial mySerial = Serial1; 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 // this keeps track of whether we're using the interrupt // off by default! boolean usingInterrupt = false; void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy 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); Serial.println("Adafruit GPS library basic 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); // the nice thing about this code is you can have a timer0 interrupt go off // every 1 millisecond, and read data from the GPS for you. that makes the // loop code a heck of a lot easier! useInterrupt(true); delay(1000); // Ask for firmware version mySerial.println(PMTK_Q_RELEASE); } // Interrupt is called once a millisecond, looks for any new GPS data, and stores it SIGNAL(TIMER0_COMPA_vect) { char c = GPS.read(); // if you want to debug, this is a good time to do it! #ifdef UDR0 if (GPSECHO) if (c) UDR0 = c; // writing direct to UDR0 is much much faster than Serial.print // but only one character can be written at a time. #endif } void useInterrupt(boolean v) { if (v) { // Timer0 is already used for millis() - we'll just interrupt somewhere // in the middle and call the "Compare A" function above OCR0A = 0xAF; TIMSK0 |= _BV(OCIE0A); usingInterrupt = true; } else { // do not call the interrupt function COMPA anymore TIMSK0 &= ~_BV(OCIE0A); usingInterrupt = false; } } uint32_t timer = millis(); void loop() // run over and over again { // in case you are not using the interrupt above, you'll // need to 'hand query' the GPS, not suggested :( if (! usingInterrupt) { // read data from the GPS in the 'main loop' char c = GPS.read(); // if you want to debug, this is a good time to do it! if (GPSECHO) if (c) Serial.print(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 } // if millis() or timer wraps around, we'll just reset it if (timer > millis()) timer = millis(); // approximately every 2 seconds or so, print out the current stats if (millis() - timer > 2000) { timer = millis(); // reset the timer Serial.print("\nTime: "); Serial.print(GPS.hour, DEC); Serial.print(':'); Serial.print(GPS.minute, DEC); Serial.print(':'); Serial.print(GPS.seconds, DEC); Serial.print('.'); 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("Location (in degrees, works with Google Maps): "); Serial.print(GPS.latitudeDegrees, 4); Serial.print(", "); Serial.println(GPS.longitudeDegrees, 4); 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); } } } When I compile and upload, it successfully does and the serial output displays something like this:
Time: 23:5:8.0 Date: 6/7/2018 Fix: 1 quality: 1 Location: 3855.8869N, 7721.3422W Location (in degrees, works with Google Maps): 38.9314, -77.3557 Speed (knots): 0.32 Angle: 211.87 Altitude: 177.90 Satellites: 7 $PGTOP,11,2*6E $GPGGA,230509.000,3855.8869,N,07721.3423,W,1,7,1.10,177.9,M,-33.4,M,,*64 $GPRMC,230509.000,A,3855.8869,N,07721.3423,W,0.28,211.87,060718,,,A*7F $PGTOP,11,2*6E $GPGGA,230510.000,3855.8869,N,07721.3424,W,1,7,1.10,177.9,M,-33.4,M,,*6B $GPRMC,230510.000,A,3855.8869,N,07721.3424,W,0.28,211.87,060718,,,A*70
Everything seems okay except that the time is also offset by 4 hours?
