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

// Pin and sensor type configuration
#define DHTPIN 2       // DHT22 data pin connected to Arduino digital pin D2
#define DHTTYPE DHT22  // We're using the DHT22 sensor

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

// Initialize the LCD - I2C address 0x27, 16 characters, 2 lines
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  dht.begin();         // Start reading from DHT sensor
  lcd.begin(16, 2);    // Start LCD
  lcd.backlight();     // Turn on LCD backlight
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
}

void loop() {
  float temperature = dht.readTemperature(); // Read temperature in Celsius
  float humidity = dht.readHumidity();       // Read humidity

  // Handle sensor read failure
  if (isnan(temperature) || isnan(humidity)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor error!");
    delay(2000);
    return;
  }

  // Display temperature
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature, 1); // one decimal place
  lcd.print((char)223);      // degree symbol
  lcd.print("C");

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

  delay(2000); // Update every 2 seconds
}