#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);


int S = 8; // count seconds 
int M = 11; // count minutes


void setup()
  {
    lcd.init();
    lcd.backlight();
    lcd.setCursor(0,0);
    lcd.print("HELLO WORLD");
    delay(2000);
    lcd.clear();
  }

void loop()
  {


    S--;
    delay(1000);
    if(S<0)
      {
        M--;
        S=59;
      }
    if(M<0)
      {
        while(1);
      }  
    
    if (S < 10 && M >= 10)
      {
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print(String(M) + ":" + "0" + String(S));
      }
    if (M < 10 && S >= 10)
      {
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("0" + String(M) + ":" + String(S));
      }
    if (M < 10 && S < 10)
      {
        lcd.clear();
        lcd.setCursor(0,0);
        lcd.print("0" + String(M) + ":" + "0" + String(S));
      }
  



  }