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

#define DHTPIN 2       // Pin sensor DHT
#define DHTTYPE DHT22  // Gunakan DHT22 atau DHT11 sesuai sensor
DHT dht(DHTPIN, DHTTYPE);

#define LED_PIN 3      // Pin LED
#define BUZZER_PIN 8  // Pin Buzzer

// Konfigurasi LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C bisa 0x27 atau 0x3F tergantung modul

// Batas suhu untuk peringatan
#define TEMP_WARNING 23   // Suhu mulai nyalakan LED
#define TEMP_ALARM 20     // Suhu mulai nyalakan buzzer

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init(); // Perbaikan dari lcd.begin() ke lcd.init()
  lcd.backlight();
  
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  
  digitalWrite(LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);
}

void loop() {
  float suhu = dht.readTemperature();
  float kelembaban = dht.readHumidity();

  if (isnan(suhu) || isnan(kelembaban)) {
    Serial.println("Gagal membaca sensor!");
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    delay(2000);
    return;
  }

  Serial.print("Suhu: ");
  Serial.print(suhu);
  Serial.print("°C, Kelembaban: ");
  Serial.print(kelembaban);
  Serial.println("%");

  // Tampilkan di LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Kelembaban: ");
  lcd.print(kelembaban);
  lcd.print("%");

  // Kontrol LED sebagai peringatan suhu
  if (suhu >= TEMP_WARNING) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("LED: ON (Peringatan Suhu)");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("LED: OFF");
  }
  

  // Kontrol Buzzer jika suhu terlalu tinggi
  if (suhu >= TEMP_ALARM) {
    digitalWrite(BUZZER_PIN, HIGH);
    tone(BUZZER_PIN, 1000);
    Serial.println("Buzzer: ON (Alarm Suhu Tinggi!)");
  } else {
    digitalWrite(BUZZER_PIN, LOW);
    Serial.println("Buzzer: OFF");
  }

  delay(2000);  // Baca sensor setiap 2 detik
}