あるでぃーの

21f.c

int spk = 13; 
//int doremi[] = {523, 587, 659, 698, 784, 880, 988, 1046};
int doremi[] = {478,  506,  568,  638,  716,  758,  851, 956};
int button[8];

void setup() {
   button_init();
   pinMode(spk, OUTPUT);
}

void loop() {
   for (int i=0; i<8; i++) {
      while (digitalRead(button[i]) == LOW) {
         digitalWrite(spk, HIGH);
         delayMicroseconds(doremi[i]);
         digitalWrite(spk, LOW);
         delayMicroseconds(doremi[i]);
      }   
      digitalWrite(spk, LOW);
   }   
}

void button_init() {
   for (int i=0; i<8; i++) {
      button[i] = i + 4;
      Serial.println(i);
      pinMode(button[i], INPUT);
      digitalWrite(button[i], HIGH);
   }   
}

21f.c++

int spk = 13; 
//int doremi[] = {523, 587, 659, 698, 784, 880, 988, 1046};
int doremi[] = {478,  506,  568,  638,  716,  758,  851, 956};
int button[8];

void setup() {
   button_init();
   pinMode(spk, OUTPUT);
}

void loop() {
   for (int i=0; i<8; i++) {
      while (digitalRead(button[i]) == LOW) {
         digitalWrite(spk, HIGH);
         delayMicroseconds(doremi[i]);
         digitalWrite(spk, LOW);
         delayMicroseconds(doremi[i]);
      }   
      digitalWrite(spk, LOW);
   }   
}

void button_init() {
   for (int i=0; i<8; i++) {
      button[i] = i + 4;
      Serial.println(i);
      pinMode(button[i], INPUT);
      digitalWrite(button[i], HIGH);
   }   
}