Struggling to design a circuit. A person brought me a mechanical arm. The arm is 12v and will only extend or contract by reversing polarity. He wanted me to connect it to a wireless remote in order to press one button and the arm will extend and stop when he releases the button (or presses it a second time) and the reverse on another button. I have loads of parts available, but most of my wireless remotes are those RC outlets which are AC. Could anyone help me think of another way to do this? I do have a 12 v dpdt switch, but that is worst case scenario because it wouldn't be wireless.