#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
#define led 2

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS1307 rtcA;

char daysOfTheWeek[7][12] - {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
int tahun, bulan, hari, jam, menit, detik;

void setup() {
 pinMode(led, OUTPUT);
 lcd init();
 lcd.backlight();
 rtcA.begin();
}

void loop() {
  DateTime now = rtcA.now();
  tahun = now.year();
  bulan = now.month();
  hari = now.day();
  jam = now.hour();
  menit = now.minute();
  detik = now.second();

 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print(tahun);
 lcd.print("/");
 lcd.print(bulan);
 lcd.print("/");
 lcd.print(hari);
 lcd.print("/");
 lcd.setCursor(0,1);
 lcd.print(jam);
 lcd.print(":");
 lcd.print(menit);
 lcd.print(":");
 lcd.print(detik);

 if(detik ==0 || detik==10 || detik==20 || detik==30 || detik==40 || detik==50){
  digitalWrite(led, HIGH);
 }else{
  digitalWrite(led, LOW);
 }
 delay(500);
}