Transduser Output Suara

const int BUZZER_PIN = 8;

// Frekuensi nada (Hz)
#define DO  262
#define RE  294
#define MI  330
#define FA  349
#define SOL 392
#define LA  440
#define SI  494
#define DO2 523

// Melodi Selamat Ulang Tahun (25 nada)
int melodi[] = {DO, DO, RE, DO, FA, MI,
                DO, DO, RE, DO, SOL, FA,
                DO, DO, DO2, LA, FA, MI, RE,
                SI, SI, LA, FA, SOL, FA};

int durasi[] = {400,200,600,600,600,1200,
                400,200,600,600,600,1200,
                400,200,600,600,600,600,1200,
                400,200,600,600,600,1200};

void setup() {
  Serial.begin(9600);
  Serial.println("Memainkan: Selamat Ulang Tahun!");
}

void loop() {
  for (int i = 0; i < 25; i++) {
    tone(BUZZER_PIN, melodi[i], durasi[i]);
    delay(durasi[i] * 1.2); // Jeda antar nada
    noTone(BUZZER_PIN);
  }
  delay(3000); // Jeda 3 detik sebelum diulang
}

const int BUZZER_PIN = 8;
const int LED_MERAH  = 13;
const int BTN_RESET  = 7;

bool alarmAktif = true; // Kita set true untuk simulasi langsung bunyi

void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
  pinMode(BTN_RESET, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  if (alarmAktif) {
    // Sirene: frekuensi NAIK
    for (int f = 500; f <= 1500; f += 50) {
      tone(BUZZER_PIN, f);
      digitalWrite(LED_MERAH, HIGH);
      delay(20);
    }
    // Sirene: frekuensi TURUN
    for (int f = 1500; f >= 500; f -= 50) {
      tone(BUZZER_PIN, f);
      digitalWrite(LED_MERAH, LOW);
      delay(20);
    }
  }
  
  // Reset alarm dengan tombol
  if (digitalRead(BTN_RESET) == LOW) {
    alarmAktif = false;
    noTone(BUZZER_PIN);
    digitalWrite(LED_MERAH, LOW);
    Serial.println("Alarm direset!");
    delay(500); // Anti-bouncing
  }
}