#include <RTClib.h>
const int relay=A3;
bool on=LOW;
bool off=HIGH;
int period;
int menit;
int detik;
RTC_DS1307 RTC;

void setup() {
  RTC.begin();
  Serial.begin(9600);
  pinMode(relay,OUTPUT);
  digitalWrite(relay,on);
  //rtc.setDOW(THURSDAY);
  //rtc.setTime(14,20,0);
  //rtc.setDate(23,1,2020);
}

void loop() {
   DateTime now=RTC.now();

    Serial.print(now.hour()); Serial.print(":");
    Serial.print(now.minute()); Serial.print(":");
    Serial.print(now.second()); Serial.print("\n");
    //jam = now.hour();
    //menit = now.minute();
    //detik = now.second();
  //if(jam == 15 ,menit ==55, detik >=0){
    digitalWrite(relay,on);
    delay(500);
    digitalWrite(relay,off);
  //}
  delay(500);
}