This is a nice example of scavenging parts from an inkjet printer to make cool stuff. It uses an Arduino and a Motor Shield to control the DC motor. The web site has a lot more information and the source code to get you started.
More about Using a DC motor as a servo with PID control
In the Maker Shed:
The gentleman states in the beginning of the video that PID stands for Position Integral Derivative. That’s wrong, it Proportional, Integral, Derivative. google it.
You’re right, good catch!
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