Matt had a great idea for expanding the usefulness of a servo motor – use it as an input device allowing one to record the motors position.

I thought this would be pretty fun; by reading the voltage from the center pin of the the servo’s potentiometer, it can be used as an input as well as an output device. Basically, you get a bunch of extra positional sensors ‘for free’.

In the above demo he uses the strategy to record and playback ‘keyframes’ with an Arduino – very cool! – Servo as input device [via Electronics-Lab]