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

int merah = 4;
int kuning = 16;
int hijau = 17;
int Button = 15;
int Buzzer = 21;

#define DHTPIN 23
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

bool sistemAktif = false;
bool lastButtonState = HIGH;

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

  pinMode(hijau, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(merah, OUTPUT);
  
  // Gunakan internal pull-up agar tombol stabil
  pinMode(Button, INPUT_PULLUP);
  
  pinMode(Buzzer, OUTPUT);

  digitalWrite(hijau, LOW);
  digitalWrite(kuning, LOW);
  digitalWrite(merah, LOW);
  noTone(Buzzer);

  Serial.println("Sistem siap. Tekan tombol untuk mengaktifkan.");
}

void loop() {
  bool buttonState = digitalRead(Button);

  // Deteksi tombol ditekan (HIGH → LOW)
  if (lastButtonState == HIGH && buttonState == LOW) {
    delay(50); // debounce
    if (digitalRead(Button) == LOW) {
      sistemAktif = !sistemAktif; // toggle sistem
      Serial.print("Sistem: ");
      Serial.println(sistemAktif ? "Aktif" : "Nonaktif");

      digitalWrite(hijau, LOW);
      digitalWrite(kuning, LOW);
      digitalWrite(merah, LOW);
      noTone(Buzzer);
    }
  }

  lastButtonState = buttonState;

  if (!sistemAktif) return; // sistem mati, hentikan loop

  delay(2000);

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

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Gagal membaca sensor DHT!");
    noTone(Buzzer);
    return;
  }

  Serial.print("Suhu: ");
  Serial.print(temperature);
  Serial.print(" *C, Kelembapan: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Logika LED + buzzer
  if (temperature < 25) {
    digitalWrite(hijau, HIGH);
    digitalWrite(kuning, LOW);
    digitalWrite(merah, LOW);
    noTone(Buzzer);
  }
  else if (temperature >= 25 && temperature <= 30) {
    digitalWrite(hijau, LOW);
    digitalWrite(kuning, HIGH);
    digitalWrite(merah, LOW);
    tone(Buzzer, 450);
  }
  else if (temperature > 30) {
    digitalWrite(hijau, LOW);
    digitalWrite(kuning, LOW);
    digitalWrite(merah, HIGH);
    tone(Buzzer, 1500);
  }
}