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

// Initialize LCD with I2C address 0x27 and dimensions 20x4
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Initialize RTC
RTC_DS1307 rtc;

// Define DHT sensor and pin
#define DHTPIN 8
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Initialize LCD
  lcd.init();
  lcd.backlight();

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

  if (!rtc.isrunning()) {
    lcd.print("RTC is NOT running!");
    // Uncomment to set RTC to compile time
    // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Initialize DHT sensor
  dht.begin();

  // Print initial message
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
  delay(2000);  // Wait for 2 seconds
}

void loop() {
  // Get current date and time from RTC
  DateTime now = rtc.now();

  // Get temperature and humidity from DHT22
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed
  if (isnan(humidity) || isnan(temperature)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor error");
    return;
  }

  // Display date and time
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  lcd.print(now.day());
  lcd.print('/');
  lcd.print(now.month());
  lcd.print('/');
  lcd.print(now.year());

  lcd.setCursor(0, 1);
  lcd.print("Time: ");
  if (now.hour() < 10) lcd.print('0');
  lcd.print(now.hour());
  lcd.print(':');
  if (now.minute() < 10) lcd.print('0');
  lcd.print(now.minute());
  lcd.print(':');
  if (now.second() < 10) lcd.print('0');
  lcd.print(now.second());

  // Display temperature and humidity
  lcd.setCursor(0, 2);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print((char)223);  // Degree symbol
  lcd.print("C");

  lcd.setCursor(0, 3);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");

  // Wait for a second before updating the display
  delay(1000);
}