// Update is called once per frame
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Escape))
        {
            dcmotor.VelocityUpdate -= onVelocityUpdate;
            dcmotor.Close();
            dcmotor = null;
            vol.VoltageRatioChange -= onVoltageRatioChange;
            vol.Close();
            vol = null;

            Application.Quit();
        }
    }