아두이노 우노 - 버튼 풀다운 도레미

 

#include <pitches.h>
#define DURATION 10

int notes[] = { NOTE_E4, NOTE_D4, NOTE_C4 };
int btns[] = { 8, 9, 10 };
int speaker = 4;
long b_state;

void setup() {
  // put your setup code here, to run once:
  for(int i = 0; i < 3; i++) {
    pinMode(btns[i], INPUT);
  }
  pinMode(speaker, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int state = 0;
  for (int i=0; i<3; i++) {
    boolean b_state = digitalRead(btns[i]);
    
  if(b_state)
    tone(speaker, notes[i], 1000);
  }
}