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

// I2C LCD settings (most common address is 0x27; try 0x3F if needed)
LiquidCrystal_I2C lcd(0x27, 16, 2);  

// DHT Sensor settings
#define DHTPIN 2        // DHT22 connected to digital pin D2
#define DHTTYPE DHT22   // We're using the DHT22 sensor

DHT dht(DHTPIN, DHTTYPE);  // Create DHT object

void setup() {
  lcd.init();            // Start the LCD
  lcd.backlight();       // Turn on the backlight
  dht.begin();           // Start the DHT sensor

  lcd.setCursor(0, 0);
  lcd.print("Temp & Humidity");
  delay(2000);           // Wait 2 seconds before starting readings
  lcd.clear();
}

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

  // Check if sensor returns valid numbers
  if (isnan(temperature) || isnan(humidity)) {
    lcd.setCursor(0, 0);
    lcd.print("Sensor error");
    lcd.setCursor(0, 1);
    lcd.print("Try again...");
  } else {
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(temperature);
    lcd.print((char)223); // Degree symbol
    lcd.print("C");

    lcd.setCursor(0, 1);
    lcd.print("Hum: ");
    lcd.print(humidity);
    lcd.print(" %");
  }

  delay(2000);  // Wait 2 seconds between updates
}