Using SKYLAB SKM53 GPS Module Arduino Sketch

Using the SKYLAB SKM53 Module is quite easy, but you need to pay special attention
to the RX and TX. RX on Arduino goes to TX on GPS module. Default baud on this GPS
is 9600. I found I could not get the GPS to connect without external power which is
3.3v but I have been running it from 5v and it seems ok.

Code from renkema.cc with some modification.

Arduino code…

/*
This Sketch will run with the SkyNav SKM53 GPS 
 RXD Arduino Pin 3
 TXD Arduino Pin 2
 RST Leave Open 
 NC Leave Open
 GND Ground
 VCC +5
 Make sure you download and save to your Arduino/Libraries folder TinyGPS.h
 and NewSoftSerial.h files.
*/

#include <TinyGPS.h>
#include <SoftwareSerial.h>

unsigned long fix_age;

SoftwareSerial GPS(2,3);
TinyGPS gps;
void gpsdump(TinyGPS &gps);
bool feedgps();
void getGPS();
long lat, lon;
float LAT, LON;

void setup(){
  GPS.begin(9600);
  Serial.begin(96
  00);
}

void loop(){
  long lat, lon;
  unsigned long fix_age, time, date, speed, course;
  unsigned long chars;
  unsigned short sentences, failed_checksum;

  // retrieves +/- lat/long in 100000ths of a degree
  gps.get_position(&lat, &lon, &fix_age);

  getGPS();
  Serial.print("Latitude : ");
  Serial.print(LAT/100000,7);
  Serial.print(" :: Longitude : ");
  Serial.println(LON/100000,7);
}

void getGPS(){
  bool newdata = false;
  unsigned long start = millis();
  // Every 1 seconds we print an update
  while (millis() - start < 1000)
  {
    if (feedgps ()){
      newdata = true;
    }
  }
  if (newdata)
  {
    gpsdump(gps);
  }
}

bool feedgps(){
  while (GPS.available())
  {
    if (gps.encode(GPS.read()))
      return true;
  }
  return 0;
}

void gpsdump(TinyGPS &gps)
{
  //byte month, day, hour, minute, second, hundredths;
  gps.get_position(&lat, &lon);
  LAT = lat;
  LON = lon;
  {
    feedgps(); // If we don't feed the gps during this long routine, we may drop characters and get checksum errors
  }
}