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

// ====== DHT Settings ======
#define DHTPIN 2
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// ====== LCD Settings ======
// Change address if needed (0x27 or 0x3F common)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);

  // Initialize DHT
  dht.begin();

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("DHT22 Sensor");
  lcd.setCursor(0, 1);
  lcd.print("Initializing");
  delay(2000);
  lcd.clear();
}

void loop() {
  delay(2000);

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Sensor error!");

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error");
    return;
  }

  // ===== Serial Output =====
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("%  ");

  Serial.print("Temp: ");
  Serial.print(temperature);
  Serial.println("C");

  // ===== LCD Output =====
  lcd.clear();

  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("%");
}