單鍵電鋼琴 演奏聖誕鈴聲

 const int buzzerPin = 8;

const int buttonPin = 2;

unsigned long lastDebounceTime = 0;

const unsigned long debounceDelay = 50;

int noteIndex = 0;

bool buttonPressed = false;

// 定義音符頻率

#define NOTE_C5 523

#define NOTE_D5 587

#define NOTE_E5 659

#define NOTE_F5 698

#define NOTE_G5 784

// 🎵 Jingle Bells（簡化延長版）

int melody[] = {

  NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5,

  NOTE_E5, NOTE_G5, NOTE_C5, NOTE_D5, NOTE_E5,

  NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5, NOTE_E5, NOTE_E5,

  NOTE_E5, NOTE_E5, NOTE_D5, NOTE_D5, NOTE_E5, NOTE_D5, NOTE_G5

};

int durations[] = {

  4, 4, 2, 4, 4, 2,

  4, 4, 4, 4, 1,

  4, 4, 2, 4, 4, 2, 4,

  4, 4, 4, 4, 4, 4, 1

};

void setup() {

  pinMode(buzzerPin, OUTPUT);

  pinMode(buttonPin, INPUT_PULLUP);

}

void loop() {

  static bool lastButtonState = HIGH;

  bool reading = digitalRead(buttonPin);

  if (reading != lastButtonState) {

    lastDebounceTime = millis();

  }

  if ((millis() - lastDebounceTime) > debounceDelay) {

    if (reading == LOW && !buttonPressed) {

      buttonPressed = true;

      playNextNote();

    }

  }

  if (reading == HIGH) {

    buttonPressed = false;

  }

  lastButtonState = reading;

}

void playNextNote() {

  int length = sizeof(melody) / sizeof(melody[0]);

  int duration = 1000 / durations[noteIndex];

  tone(buzzerPin, melody[noteIndex], duration);

  delay(duration * 1.3);

  noTone(buzzerPin);

  noteIndex++;

  if (noteIndex >= length) {

    noteIndex = 0; // 從頭開始

  }

}