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

#define DHTPIN 15        // DHT11 data pin connected to GPIO 15
#define DHTTYPE DHT11    // DHT 11 sensor
#define BUZZER_PIN 13    // Buzzer connected to GPIO 13

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // LCD I2C address 0x27

void setup() {
  // Initialize the LCD
  lcd.begin(16, 2);
  lcd.backlight();
  
  // Initialize the DHT11 sensor
  dht.begin();
  
  // Set buzzer pin as output
  pinMode(BUZZER_PIN, OUTPUT);
  
  // Start the serial monitor
  Serial.begin(115200);
  Serial.println("DHT11 and LCD with ESP32-S2");

  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
}

void loop() {
  // Read temperature and humidity from DHT11
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Check if any reading failed
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error   ");
    return;
  }

  // Print to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C  ");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Display on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print(" %");
  
  // Trigger buzzer if temperature exceeds threshold
  if (temperature > 30.0) {
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(2000); // Wait for 2 seconds before next reading
}