const int pirPin = 3;
const int buzzerPin = 5;
const int buttonPin = 8;

bool systemActive = false;
bool lastButtonState = LOW;

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  bool buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH && lastButtonState == LOW) {
    delay(50);
    if (digitalRead(buttonPin) == HIGH) {
      systemActive = !systemActive; 

      if (systemActive) {
        tone(buzzerPin, 2000, 200); 
        delay(300);
        tone(buzzerPin, 2000, 200); 
        Serial.println("System ON");
      } else {
        tone(buzzerPin, 500, 200);
        delay(300);
        tone(buzzerPin, 500, 200); 
        Serial.println("System OFF");
      }
    }
  }

  lastButtonState = buttonState;

  if (systemActive) {
    int pirState = digitalRead(pirPin);

    if (pirState == HIGH) {
      Serial.println("Motion detected! Alarm ON!"); 

      for (int i = 0; i < 3; i++) {
        // Nada 
        tone(buzzerPin, 2500, 300);
        delay(300);
      }
    } else {
      // Matikan buzzer
      noTone(buzzerPin);
      Serial.println("No motion. Alarm OFF!");
    }
  } else {
    noTone(buzzerPin);
  }

  delay(200);
}