The device have to change the direction of rotation of the 12V motor.
The project was started with the idea of using a device for opening and closing a ball valve to supply water to the greenhouse. But later it stopped due to lack of time, motivation, etc.
But some time ago, one of the organizers of the airsoft games, asked to design a device for him. Later I will uncover what is this. But now let it be a small secret. What I can to say, it that in this device I need the same - to change the direction of rotation of the motor.