#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);
int select = 0;
int number = 1;
long hour = 0;

long minute = 59, second = 59;
long countdown_time = (hour*3600) + (minute * 60) + second;

void setup() {

  if (select == 1){
    lcd.begin(16, 2); // Set up the number of columns and rows on the LCD.
    // Print a message to the LCD.
    lcd.print("My Turn:");
  }
  else{
    lcd.begin(0, 4);
    lcd.print("TIME:");
  }    
}

void loop() {
  
  if(select == 1){
  lcd.setCursor(8, 1);
  lcd.print(number);
  delay(1000); // Wait for 1000 millisecond(s)
  }
  else{
  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);
  }
}