孫の手MIDIバイオリン

#define NOTE_ON 144
#define NOTE_OFF 128
#define CONTROL_CHANGE 176
#define ALL_NOTE_OFF 120

volatile int state = 0;
volatile boolean Flag_A = true;
volatile boolean Flag_B = false;

#define BUTTON_MAX 7
int pin_no[] = {4,5,6,7,8,9,10}; //ピン番号を保存
int sw_state[] = {0,0,0,0,0,0,0}; //スイッチ状態を保存
int note_no[] = {60,61,62,63,64,65,66,67}; //スイッチ毎のノートナンバー
int curr_note = 0;
int prev_state = 0;

void setup()
{
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  attachInterrupt(0, Fall_A, FALLING);
  attachInterrupt(1, Change_B, CHANGE);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
  pinMode(6, INPUT);
  pinMode(7, INPUT);
  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(10, INPUT);
  Serial.begin(31250);
  sendMidi(CONTROL_CHANGE, ALL_NOTE_OFF, 0);
}

void loop()
{
  int save_state = state;
  delay(1000);
  if (curr_note && (save_state == state)) {
    sendMidi(NOTE_ON, curr_note, 0);
    curr_note = 0;
  }
}

void Fall_A()
{
  if (!Flag_A) { return; }
  Flag_B = true;
  Flag_A = false;
}

void Change_B()
{
  if (!Flag_B) { return; }
  if (HIGH == digitalRead(2)) {
    if (HIGH == digitalRead(3)) {
      state--;
    } else {
      state++;
    }
    Flag_B = false;
    Flag_A = true;
    int new_note = 60;
    if (HIGH == digitalRead(4)) {
      new_note = 61;
    }
    if (HIGH == digitalRead(5)) {
      new_note = 62;
    }
    if (HIGH == digitalRead(6)) {
      new_note = 63;
    }
    if (HIGH == digitalRead(7)) {
      new_note = 64;
    }
    if (HIGH == digitalRead(8)) {
      new_note = 65;
    }
    if (HIGH == digitalRead(9)) {
      new_note = 66;
    }
    if (HIGH == digitalRead(10)) {
      new_note = 67;
    }
    if (curr_note != new_note) {
      if (curr_note != 0) {
        sendMidi(NOTE_ON, curr_note, 0);
      }
      curr_note = new_note;
      sendMidi(NOTE_ON, curr_note, 127);
    }
    prev_state = state;
  }
}

void sendMidi(int cmd, int pitch, int velocity)
{
  Serial.write(cmd);
  Serial.write(pitch);
  Serial.write(velocity);
}