The assembly of the unit where the wheel/gear is situated in the encasing chamber and the wheel is connected to a 5V stepper motor via the rod of the stepper motor, which controls the rotation of the wheel via an Arduino board, and a custom Android application. The groove is shown on the wheel. The electrical wires supply the power to the stepper motor for rotation. The rotation of the wheel is controlled by the stepper motor, an Arduino, and a custom Android application.
