Powerfull servo using windshield wiper motor

This isn’t my idea, but for a project (converting a dashboard in a Honda Civie 1998) I needed a strong servo motor. We tried  an MG996R first. But that was way to weak. So why not use a Windshield wiper motor used in a car. They have a worm-gear mechanism, cost little and need no maintenance.

Most of these motors will require about 2-3A to operate at 12V. I used a L298D board (ebay) for driving the motor. L298

Next was something needed to measure the position. I saw a youtube film of someone glueing a potentiometer onto the shaft and using that as measurement. However potentiometers might wear out too soon until I found a very nice compact adjustable potentiometer (bourns 3382H-1-103).

R7703150-01

These pots can rotate continuously. But only work for about a 300 degrees range.

I am using a simple ATTiny45 as a controller to compare the potmeter value to a set value. And that is all. I can get the 5V from the L298D board. I made a prototype board for testing purposes. So far it seems quite succesful.

On the Windshield wiper motor the shaft is replace with a stronger shaft with ball bearings making it very stable. If all goes well I should have a very nice version at the Amsterdam Maker Festival 30-May to 1st of June 2014.

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