GPS_nano_mp3

GPS_nano_mp3.cpp

#define pinNUM 5
int location[5] = {2, 3, 4, 5, 6};
unsigned long triggerTime;
unsigned long lastTriggerTime[pinNUM] = {};

void setup()  
{    
  for (int i = 0; i < 5; i++)
  {
    pinMode(location[i], OUTPUT);
    digitalWrite(location[i], HIGH);
  }
  GPS.begin(9600);
  //.
  //.
  //.
  //there are lots of code above and it's about GPS, but not the point so skip it
}

//here also has interrupt function for GPS to grab the info

void loop()    
{
   triggerTime = millis();
   if (GPS.newNMEAreceived())
   {
     GPS.parse(GPS.lastNMEA());
     if (GPS.fix)
     {
        Serial.print("Latitude: ");
        Serial.println(GPS.latitude);
        Serial.print("Longitude: ");
        Serial.println(GPS.longitude);
        Serial.print("numebr of satellities: ");
        Serial.println(GPS.satellites);
        Serial.print("HDOP: ");
        Serial.println(GPS.HDOP);
        
        if (GPS.HDOP < 3)
        {
          if (triggerTime - lastTriggerTime[0] > 15000)// longitude and latitude of the first location will add up later
          {
            lastTriggerTime[0] = triggerTime;
            digitalWrite(location[0], LOW);
            delay(1000);
            digitalWrite(location[0], HIGH);
            Serial.println("song1 started!");
          }
        }
     }
   }
}