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

  #define DHT_SENSOR_PIN 23
  #define DHT_SENSOR_TYPE DHT22

  LiquidCrystal_I2C lcd(0x27, 16, 2);
  DHT dht_sensor(DHT_SENSOR_PIN, DHT_SENSOR_TYPE);

  RTC_DS1307 rtc;

  #define SPEAKER_PIN (5)
  #define POT_PIN (34)

  void setup() {
    dht_sensor.begin();
    lcd.init();
    lcd.backlight();
    
    Wire.begin();
    rtc.begin();

    pinMode(POT_PIN, INPUT);
  }

  void loop() {
    float humi  = dht_sensor.readHumidity();
    float tempC = dht_sensor.readTemperature();
    int alarmTemp = map(analogRead(POT_PIN), 0, 1023, 0, 255);

    if (isnan(tempC) || isnan(humi)) {
      lcd.setCursor(0, 0);
      lcd.print("Failed");
    } else {
      lcd.setCursor(0, 0);
      lcd.print("T");
      lcd.print(tempC);
      lcd.print("°C");

      lcd.setCursor(0, 1);
      lcd.print("H");
      lcd.print(humi);
      lcd.print("%");

      DateTime now = rtc.now();
      lcd.setCursor(10, 0);
      lcd.print(now.hour());
      lcd.print(':');
      lcd.print(now.minute());

      if (tempC > alarmTemp)
      {
        tone(SPEAKER_PIN, 392, 500);
        tone(SPEAKER_PIN, 330, 500);
        tone(SPEAKER_PIN, 330, 500);
        delay(500);
        noTone(SPEAKER_PIN);
      }
    }
    delay(2000);
    lcd.clear();
  }