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#include <HardwareSerial.h>
#include <TinyGPSPlus.h>

HardwareSerial GPSSerial (2);
TinyGPSPlus gps;

void setup()
{
  Serial.begin(9600);
  GPSSerial.begin ( 9600, SERIAL_8N1, 16, 17 ); // begin GPS hardware serial
}

void loop()
{
  Serial.begin(9600);
  // This sketch displays information every time a new sentence is correctly encoded.
  while (GPSSerial.available() > 0)
    if (gps.encode(GPSSerial.read()))
      displayInfo();

  if (millis() > 10000 && gps.charsProcessed() < 10)
  {
    Serial.println(F("No GPS detected: check wiring."));
    while(true);
  }
}

void displayInfo()
{
  Serial.print(F("Location: ")); 
  if (gps.location.isValid())
  {
    Serial.print(gps.location.lat(), 9);
    Serial.print(F(","));
    Serial.print(gps.location.lng(), 9);
  }
  else
  {
    Serial.print(F("INVALID"));
  }
}