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

// Define DHT22 pin and type
#define DHTPIN 8
#define DHTTYPE DHT22

// Initialize LCD (Address: 0x27 for many I2C LCDs, 20 columns and 4 rows)
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Initialize RTC
RTC_DS1307 rtc;

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Initialize Serial Monitor for debugging (optional)
  Serial.begin(9600);
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  
  // Initialize RTC
  if (!rtc.begin()) {
    lcd.setCursor(0, 0);
    lcd.print("RTC not found!");
    while (1); // Stop execution
  }
  
  // Check if RTC is running, if not set the time
  if (!rtc.isrunning()) {
    lcd.setCursor(0, 1);
    lcd.print("RTC not running!");
    // Set RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
  
  // Initialize DHT sensor
  dht.begin();
}

void loop() {
  // Get current time from RTC
  DateTime now = rtc.now();
  
  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature(); // Celsius
  float humidity = dht.readHumidity();
  
  // Clear LCD before updating
 /// lcd.clear();
  
  // Display Date: DD/MM/YYYY
  lcd.setCursor(0, 0);
  lcd.print("Date: ");
  if (now.day() < 10) lcd.print('0');
  lcd.print(now.day());
  lcd.print('/');
  if (now.month() < 10) lcd.print('0');
  lcd.print(now.month());
  lcd.print('/');
  lcd.print(now.year());
  
  // Display Time: HH:MM:SS
  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
  lcd.setCursor(0, 2);
  lcd.print("Temp: ");
  if (isnan(temperature)) {
    lcd.print("N/A");
  } else {
    lcd.print(temperature);
    lcd.print(" C");
  }
  
  // Display Humidity
  lcd.setCursor(0, 3);
  lcd.print("Humidity: ");
  if (isnan(humidity)) {
    lcd.print("N/A");
  } else {
    lcd.print(humidity);
    lcd.print(" %");
  }
  
  // Optional: Print to Serial Monitor for debugging
   Serial.print("Date: ");
  Serial.print(now.day());
  Serial.print('/');
  Serial.print(now.month());
  Serial.print('/');
  Serial.print(now.year());
  Serial.print(" Time: ");
  Serial.print(now.hour());
  Serial.print(':');
  Serial.print(now.minute());
  Serial.print(':');
  Serial.print(now.second());
  Serial.print(" Temp: ");
  Serial.print(temperature);
  Serial.print(" C Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");
    
  // Wait for 1 second before updating again
  delay(1000);
}