//code sourced from PabitraKumarGhorai
#include <LiquidCrystal.h> // For LCD
#include <TinyGPSPlus.h> // For GPS
#include <SoftwareSerial.h> // For GPS

// Make sure wiring is correct!!
SoftwareSerial NEO6M(5,6); // (Rx, Tx)
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(7, 8, 9, 10, 11, 12);
TinyGPSPlus gps;

volatile float minutes, seconds;
volatile int degree, secs, mins;

void setup() {
  Serial.begin(9600);
  NEO6M.begin(9600);
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  // lcd.print("Hello, World!"); Example of how to print to LCD
}

void loop() {
  smartDelay(1000);	/* Generate precise delay of 1ms */
  unsigned long start;
  double lat_val, lng_val, alt_m_val;
  uint8_t hr_val, min_val, sec_val;
  bool loc_valid, alt_valid, time_valid;
  lat_val = gps.location.lat();	/* Get latitude data */
  loc_valid = gps.location.isValid();	/* Check if valid location data is available */
  lng_val = gps.location.lng();	/* Get longtitude data */

  if (!loc_valid)
  {          
   Serial.print("Latitude : ");
   Serial.println("*****");
   Serial.print("Longitude : ");
   Serial.println("*****");
   lcd.clear();
   lcd.setCursor(0,1);
   lcd.print("Location data invalid!");
  }
  else
  {
   DegMinSec(lat_val);
   Serial.print("Latitude in Decimal Degrees : ");
   Serial.println(lat_val, 6);
   Serial.print("Latitude in Degrees Minutes Seconds : ");
   Serial.print(degree);
   Serial.print("\t");
   Serial.print(mins);
   Serial.print("\t");
   Serial.println(secs);
   DegMinSec(lng_val);	/* Convert the decimal degree value into degrees minutes seconds form */
   Serial.print("Longitude in Decimal Degrees : ");
   Serial.println(lng_val, 6);
   Serial.print("Longitude in Degrees Minutes Seconds : ");
   Serial.print(degree);
   Serial.print("\t");
   Serial.print(mins);
   Serial.print("\t");
   Serial.println(secs);
   // Print Lat/Long to LCD:
   //lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("Lat: ");
   lcd.setCursor(5,0);
   lcd.print(lat_val, 8);
   lcd.setCursor(0,1);
   lcd.print("Lon: ");
   lcd.setCursor(5,1);
   lcd.print(lng_val, 8);
  }
}

static void smartDelay(unsigned long ms)
{
  unsigned long start = millis();
  do 
  {
    while (NEO6M.available())	/* Encode data read from GPS while data is available on serial port */
      gps.encode(NEO6M.read());
/* Encode basically is used to parse the string received by the GPS and to store it in a buffer so that information can be extracted from it */
  } while (millis() - start < ms);
}

void DegMinSec( double tot_val)		/* Convert data in decimal degrees into degrees minutes seconds form */
{  
  degree = (int)tot_val;
  minutes = tot_val - degree;
  seconds = 60 * minutes;
  minutes = (int)seconds;
  mins = (int)minutes;
  seconds = seconds - minutes;
  seconds = 60 * seconds;
  secs = (int)seconds;
}