Marc de Vinck has been producing an excellent series of tutorial videos that show you how to make things with the Arduino microcontroller. In this third installment, he uses the Arduino to control a servo motor with a potentiometer.
If you're interested in learning how to use the Arduino, I recommend starting with the slim, easy-to-grok book, Getting Started with Arduino, by Massimo Banzi, the co-founder of Arduino.
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