SukBuzzer

class Buzzer {
  private:
    int _pin;
    bool _state;
    bool _tone_up_phase;
    int _current_tone;
    int _lower_tone;
    int _upper_tone;
    int _tone_change_step;
  public:
    Buzzer (int pin, int lower_tone = 1000, int upper_tone = 9000, int tone_change_step = 5){
      _pin = pin;
      _state = false;
      _tone_up_phase = true;
      _current_tone = 0;
      _lower_tone = lower_tone;
      _upper_tone = upper_tone;
      _tone_change_step = tone_change_step;
    }
    void set_state(bool state) {
        _state = state;
        if (state) {
            _current_tone = _lower_tone;
            _tone_up_phase = true;
        }
    }
    bool get_state() {
        return _state;
    }
    void update(){
      if (_state){
        if (_tone_up_phase) {
          if (_current_tone < _upper_tone){
            _current_tone += _tone_change_step;
          } else {
            _tone_up_phase = false;
          }
        } else {
          if (_current_tone > _lower_tone){
            _current_tone -= _tone_change_step;
          } else {
            _tone_up_phase = true;
          }
        }
        tone(_pin, _current_tone);
      } else {
        noTone(_pin);
      }
    }
};