Arduino GPS module test sketch

This is a GPS module test sketch for Arduino based on a LCD1602 shield. You can either save it to local INO file and build width Arduino IDE (TinyGPS library is required). You can also compile it online into a HEX file and upload to Arduino with AVRDUDE or other uploading utilities.

#include <LCD4Bit_mod.h>
#include <TinyGPS.h>

LCD4Bit_mod lcd = LCD4Bit_mod(2);
TinyGPS gps;

void setup()
    // change the baudrate to adapt with GPS module

void loop()
    static bool ready = false;
    if (!Serial.available()) return;
    char c =;
    // push NMEA characters to TinyGPS
    if (!gps.encode(c)) {
        // parsed data not ready
        if (!ready) lcd.print(c);

      char buf[16];
      unsigned long fix_age;
      long lat, lon;
      gps.get_position(&lat, &lon, &fix_age);
      sprintf(buf, "LAT:%d.%05ld",
        (int)(lat / 100000), lat % 100000);
      lcd.cursorTo(1, 0);
      sprintf(buf, "LON:%d.%05ld",
        (int)(lon / 100000), lon % 100000);
      lcd.cursorTo(2, 0);
      ready = true;

If you need a GPS receiver for Arduino, check this out:

  • Low-power consumption SIRF 3 chip
  • No breakout needed for use with Arduino
  • 9600Hz TTL UART interface
  • Working with Arduino and TinyGPS
  • Built-in antenna and mounting magnet
  • Size:52x48x10 mm
  • Weight: 80g
  • Price: US$ 35 (free shipping worldwide)

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