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

// Initialize the LCD, adjust the I2C address (0x27 is common for LCD2004)
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Define DHT22 sensor settings
#define DHTPIN 13      // DHT22 data pin connected to GPIO 13
#define DHTTYPE DHT22  // DHT22 (AM2302) sensor type
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  // Start the LCD and set up the DHT sensor
  lcd.init();        // Initialize the LCD (using init instead of begin)
  lcd.backlight();   // Turn on the backlight
  
  dht.begin();
  
  // Display initial message on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp & Humidity");
  delay(2000);
}

void loop() {
  // Read temperature and humidity from the DHT22 sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any readings failed and exit early
  if (isnan(humidity) || isnan(temperature)) {
    lcd.setCursor(0, 0);
    lcd.print("Error reading data");
    return;
  }

  // Display temperature on the first line
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  // Display humidity on the second line
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");

  // Wait before updating again
  delay(2000);
}