Homemade servo controller suggestions

I did a search, but not sure what terms to really use.

I have a DC motor and a potentiometer. Does anyone know of a board that can control this setup like a servo? I know this can be done with arduino, but all I really need to do is have the motor open or close 90 degrees.

More details if you are interested:

I am trying to control exhaust flaps on a car. There is a motor with a gearbox which turns the flap. Above that, there is a throttle position sensor which measures motor position. Exactly like a servo without the microcontroller.

submitted by /u/GooberMascot
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