Prototyping/2019-10-16

Starting with a very simple program...

void setup() {
  tone(11, 220, 60);
  delay(100);
  tone(11, 440, 60);
  delay(100);
  tone(11, 880, 60);
  delay(1000);
}

void loop() {
}

How do frequencies relate to tones... See Piano key frequencies