gistfile1.ino

// Speaker Clicker

int maxIndicatorPin = 1;
int okayIndicatorPin = 2;
int speakerPin = 13;
int pitchPin = 0;
int pitch = 750;

void setup() {
  pinMode(speakerPin, OUTPUT);
  pinMode(maxIndicatorPin, OUTPUT);
  pinMode(okayIndicatorPin, OUTPUT);
}

void loop() {
  pitch = analogRead(pitchPin);
  int pitchDelay = map(pitch, 0, 1023, 500, 1000);
  digitalWrite(speakerPin, HIGH);
  delayMicroseconds(pitchDelay);
  digitalWrite(speakerPin, LOW);
  delayMicroseconds(pitchDelay);

  if (pitchDelay <= 501) {
    digitalWrite(maxIndicatorPin, HIGH);
    digitalWrite(okayIndicatorPin, LOW);
  } else {
    digitalWrite(maxIndicatorPin, LOW);
    digitalWrite(okayIndicatorPin, HIGH);
  }
}