/*
 The circuit:
* LCD RS pin to digital pin 11
* LCD Enable pin to digital pin 10
* LCD D4 pin to digital pin 3
* LCD D5 pin to digital pin 2
* LCD D6 pin to digital pin 1
* LCD D7 pin to digital pin 0
* LCD R/W pin to ground
* LCD VSS pin to ground
* LCD VCC pin to 5V
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
*/
// include the library code:

#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(11, 10, 3, 2, 1, 0);


long hour = 23, minute = 59, second = 59;
long countdown_time = (hour*3600) + (minute * 60) + second;
void setup() {

  lcd.setCursor(4, 0);
  lcd.print("HH:MM:SS");
}

void loop() {
  long countdowntime_seconds = countdown_time - (millis() / 1000);
  if (countdowntime_seconds >= 0) {
    long countdown_hour = countdowntime_seconds / 3600;
    long countdown_minute = ((countdowntime_seconds / 60)%60);
    long countdown_sec = countdowntime_seconds % 60;
    lcd.setCursor(4, 1);
    if (countdown_hour < 10) {
      lcd.print("0");
    }
    lcd.print(countdown_hour);
    lcd.print(":");
    if (countdown_minute < 10) {
      lcd.print("0");
    }
    lcd.print(countdown_minute);
    lcd.print(":");
    if (countdown_sec < 10) {
      lcd.print("0");
    }
    lcd.print(countdown_sec);
  }
  delay(500);
}