#include <Wire.h> // Include Wire library for I2C communication
#include <LiquidCrystal_I2C.h> // Include LCD library
#include <RTClib.h> // Include RTC library

RTC_DS3231 rtc; // Create an instance of the RTC

const int SDA_PIN = A4;
const int SCL_PIN = A5;

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

void setup() {
  Wire.begin(); // Initialize I2C communication
  lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight

  if (!rtc.begin()) { // Initialize RTC
    lcd.print("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) { // If RTC lost power, set the time to the compile time
    lcd.print("RTC lost power, setting time...");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  DateTime now = rtc.now(); // Get current time from RTC
  
  lcd.clear(); // Clear the LCD screen
  lcd.setCursor(0, 0); // Set cursor to the first column of the first row
  lcd.print("Date: "); // Print "Date: " on LCD
  lcd.print(now.year(), DEC); // Print year
  lcd.print('/');
  lcd.print(now.month(), DEC); // Print month
  lcd.print('/');
  lcd.print(now.day(), DEC); // Print day

  lcd.setCursor(0, 1); // Set cursor to the first column of the second row
  lcd.print("Time: "); // Print "Time: " on LCD
  lcd.print(now.hour(), DEC); // Print hour
  lcd.print(':');
  lcd.print(now.minute(), DEC); // Print minute
  lcd.print(':');
  lcd.print(now.second(), DEC); // Print second

  delay(1000); // Delay for 1 second
}