#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

unsigned int second = 0;
unsigned int minute = 0;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  lcd.begin(16,2);
  
  set_timer(0,59);

}

void loop() {
  // put your main code here, to run repeatedly:
  
  delay(100);
  lcd.setCursor(0,0);
  lcd.clear();

  if (second >= 60){
    second = 0;
    if (minute >= 60){
      minute = 0;
    } else {
      minute++;
    }
  } else {
    second++;
  }

  printing_format(second,minute);
}

void set_timer(int sec,int minu){
  second = sec;
  minute = minu;
}

void printing_format(int sec,int minu){
  if (sec >= 10){
    lcd.setCursor(5,0);
    lcd.print(minu);
  } else {
    lcd.setCursor(6,0);
    lcd.print(minu);
    lcd.setCursor(5,0);
    lcd.print(0);
  }

  lcd.setCursor(7,0);
  lcd.print(':');
  
  if (minu >= 10){
    lcd.setCursor(9,0);
    lcd.print(sec);
  } else {
    lcd.setCursor(8,0);
    lcd.print(sec);
    lcd.setCursor(0,0);
    lcd.print(0);
  }
  
}