pianoblink.ino

void setup() {
  pinMode(9, OUTPUT);
  pinMode(1, INPUT_PULLUP);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);
  pinMode(7, INPUT_PULLUP);
}

void loop() {
    if(digitalRead(1) == LOW){
      tone(261);
    }
    if(digitalRead(2) == LOW){
      tone(293);
    }
    if(digitalRead(3) == LOW){
      tone(329);
    }
    if(digitalRead(4) == LOW){
      tone(349);
    }
    if(digitalRead(5) == LOW){
      tone(391);
    }
    if(digitalRead(6) == LOW){
      tone(450);
    }
    if(digitalRead(7) == LOW){
      tone(520);
    }
}

void tone(float freq){
      digitalWrite(9, HIGH);   // turn the LED on (HIGH is the voltage level)
      delayMicroseconds(1000000 / freq / 2);                       // wait for a second
      digitalWrite(9, LOW);    // turn the LED off by making the voltage LOW
      delayMicroseconds(1000000 / freq / 2); 
}