#include <Wire.h>
#include <RTClib.h>

const int LED_PIN = 4; 

RTC_DS1307 rtc; 
DateTime start;
bool isLedOn = false;
unsigned long ledStartTime;

void setup() {
  Serial.begin(9600);
  rtc.begin();
  pinMode(LED_PIN, OUTPUT);
  start = rtc.now();
}

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

  Serial.print("Дата: ");
  Serial.print(now.day());
  Serial.print('/');
  Serial.print(now.month());
  Serial.print('/');
  Serial.print(now.year());
  Serial.print(" Время: ");
  Serial.print(now.hour());
  Serial.print(':');
  Serial.print(now.minute());
  Serial.print(':');
  Serial.println(now.second());

  if (start.minute() != now.minute()) {
    start = now;
    isLedOn = true;
    digitalWrite(LED_PIN, HIGH);
    ledStartTime = millis();
  }

  if (isLedOn && (millis() - ledStartTime >= 2000)) {
    digitalWrite(LED_PIN, LOW);
    isLedOn = false;
  }

  delay(1000);
}