Switch branches/tags
Nothing to show
Find file Copy path
19ad731 Feb 14, 2013
2 contributors

Users who have contributed to this file

@driverblock @ladyada
124 lines (103 sloc) 4.74 KB
// 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
// ------>
// Pick one up today at the Adafruit electronics shop
// and help support open source hardware & software! -ada
//This code is intended for use with Arduino Leonardo and other ATmega32U4-based Arduinos
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
// 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 8
// Connect the GPS RX (receive) pin to Digital 7
// If using hardware serial:
// Connect the GPS TX (transmit) pin to Arduino RX1 (Digital 0)
// Connect the GPS RX (receive) pin to matching TX1 (Digital 1)
// If using software serial, keep these lines enabled
// (you can change the pin numbers to match your wiring):
//SoftwareSerial mySerial(8, 7);
//Adafruit_GPS GPS(&mySerial);
// If using hardware serial, comment
// out the above two lines and enable these two lines instead:
Adafruit_GPS GPS(&Serial1);
HardwareSerial mySerial = Serial1;
// 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.println("Adafruit GPS library basic test!");
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
// uncomment this line to turn on only the "minimum recommended" data
// 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
// Ask for firmware version
uint32_t timer = millis();
void loop() // run over and over again
char c =;
// if you want to debug, this is a good time to do it!
if ((c) && (GPSECHO))
// 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.print("Date: ");
Serial.print(, 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(;
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);