//I2D LCD 연결하기
// I2C LCD1602 예제2 //

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4); // LCD 설정: 주소 0x27, 20칸, 4줄

unsigned long time = 0;
unsigned char hour = 0, minute = 0, second = 0;

void setup()
{
  lcd.init(); // LCD 초기화
  lcd.backlight(); // backlight 켜기
}

void loop()
{

  second = time % 60;
  minute = time / 60;
  hour = time / 3600;

  lcd.home();
  if(hour%24/10 <1) lcd.print("0");
  lcd.print(hour % 24);
  lcd.print(":");
  if(minute%60/10 <1) lcd.print("0");
  lcd.print(minute % 60);
  lcd.print(":");
  if(second/10 <1) lcd.print("0");
  lcd.print(second);

  //delay(10);
  time ++;
}