#include <DHT.h>
#include <LiquidCrystal.h>

// ====== DHT22 ======
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// ====== RELAY ======
#define RELAY 8

// ====== LCD ======
LiquidCrystal lcd(12, 11, 5, 4, 3, 6);

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

  // Inisialisasi
  dht.begin();
  pinMode(RELAY, OUTPUT);
  digitalWrite(RELAY, LOW);

  lcd.begin(16, 2);
  lcd.print("Monitoring");
  delay(2000);
  lcd.clear();
}

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

  // Cek error sensor
  if (isnan(suhu)) {
    Serial.println("Gagal membaca sensor!");

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    delay(2000);
    return;
  }

  // Serial Monitor
  Serial.print("Suhu: ");
  Serial.print(suhu);
  Serial.println(" C");

  // LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print(" C");

  // Logika kipas
  lcd.setCursor(0, 1);
  if (suhu >= 30) {
    digitalWrite(RELAY, HIGH);
    lcd.print("Kipas ON ");
    Serial.println("Kipas ON");
  } else {
    digitalWrite(RELAY, LOW);
    lcd.print("Kipas OFF");
    Serial.println("Kipas OFF");
  }

  Serial.println("------------------");
  delay(2000);
}