// Nama   : Nur Alisa
// NIM    : 2209106089


// MODUL 2 LATIHAN 1 : POLA SOS, 3 KEDIPAN PENDEK -> 3 KEDIPAN PANJANG -> 3 KEDIPAN PENDEK

// Pin Konfigurasi
const int LED_RED = 3;   
const int BUTTON_PIN = 4;  

// Variabel
bool powerOff = false;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
int lastButtonState = HIGH;
int buttonState;

void setup() {
  Serial.begin(115200);
  pinMode(LED_RED, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  
  Serial.println("SISTEM POLA LAMPU DARURAT SOS");
  Serial.println("Tekan tombol untuk memulai");
}

void loop() {
  // Baca status tombol dengan debouncing
  int reading = digitalRead(BUTTON_PIN);
  
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      
      // Jika tombol ditekan (LOW karena menggunakan PULLUP)
      if (buttonState == LOW) {
        powerOff = !powerOff;
        if (powerOff) {
          Serial.println("Tombol LOW terdeteksi! Memulai sinyal SOS");
        } else {
          Serial.println("Lampu kembali menyala! Sinyal SOS berhenti");
          digitalWrite(LED_RED, LOW); 
        }
      }
    }
  }
  
  lastButtonState = reading;
  if (powerOff) {
    blinkSOS();
  }
}

void blinkSOS() {

  // 3 kedipan pendek (S)
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_RED, HIGH);
    delay(250);
    digitalWrite(LED_RED, LOW);
    delay(250);
  }

  delay(400);

  // 3 kedipan panjang (O)
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_RED, HIGH);
    delay(700);
    digitalWrite(LED_RED, LOW);
    delay(300);
  }

  delay(400);

  // 3 kedipan pendek (S)
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_RED, HIGH);
    delay(250);
    digitalWrite(LED_RED, LOW);
    delay(250);
  }

  delay(1000); 
}