Theremin Ranging Turnoff

theremin.ino

  void loop() {
    // put your main code here, to run repeatedly:
    long dist = msToCm(ping());

    if ( dist < 100.00 ) {
      toneCounter = 0;

      // 1    == min distance in cm
      // 100  == max distance in cm
      // 1500 == max frequency
      // 500  == min frequency
      int pitch = map(dist, 1, 100, 1568, 784);
      tone(buzzer, pitch);

    } else {
      toneCounter++;

      if ( toneCounter == 100 ) {
        toneCounter = 0;
        noTone(buzzer);
      }
    }
  }