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

// Initialize the LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Set the I2C address and the LCD dimensions

// Initialize the RTC module
RTC_DS1307 rtc;

// Define push button pins
const int hourButtonPin = 6;
const int minuteButtonPin = 7;

int setHour = 0;    // Variable to hold the hour value
int setMinute = 0;  // Variable to hold the minute value

const int buzzerPin = 8;  // Digital pin connected to the buzzer

void setup() {
  lcd.begin(16, 2);  // Initialize the LCD dimensions (16x2)
  lcd.backlight();  // Turn on the LCD backlight
  pinMode(hourButtonPin, INPUT_PULLUP);    // Set hour button pin as input with internal pull-up resistor
  pinMode(minuteButtonPin, INPUT_PULLUP);  // Set minute button pin as input with internal pull-up resistor

  pinMode(buzzerPin, OUTPUT);  // Set buzzer pin as output

  Wire.begin();
  rtc.begin();

  // Uncomment the line below if you want to set the time initially
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

void loop() {
  // Read the current time from the RTC module
  DateTime currentTime = rtc.now();

  // Check if the hour button is pressed
  if (digitalRead(hourButtonPin) == LOW) {
    // Increment the hour when the button is pressed
    setHour = (setHour + 1) % 24;

    // Wait a short delay to avoid multiple increments with a single press
    delay(200);
  }

  // Check if the minute button is pressed
  if (digitalRead(minuteButtonPin) == LOW) {
    // Increment the minute when the button is pressed
    setMinute = (setMinute + 1) % 60;

    // Wait a short delay to avoid multiple increments with a single press
    delay(200);
  }

  // Display the set time on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Set Time: ");
  lcd.print(setHour);
  lcd.print(":");
  if (setMinute < 10) {
    lcd.print("0");
  }
  lcd.print(setMinute);

  // Compare the set time with the real-time on the RTC module
  if (currentTime.hour() == setHour && currentTime.minute() == setMinute) {
    lcd.setCursor(0, 1);
    lcd.print("Time Match!");

    // Activate the buzzer
    digitalWrite(buzzerPin, HIGH);
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Not Matched");

    // Deactivate the buzzer
    digitalWrite(buzzerPin, LOW);
  }
}