Variable Relay?

 Hi Instructables!,

I'm working on a project to control a robot from the web but before I build it I want to find a way to control 24v motors from a laptop parallel port using relays and another power source. My problem is controlling them variably like from a joystick without going either on or off. I do happen to have an arduino microcontroller I could use but I was hoping not to simply for ease and cost reasons.

Thanks for your help :)

orksecurity7 years ago
A "variable relay" is an amplifier.