http://cnmat.berkeley.edu/recipe/diy_position_sensing_linear_potentiometer_using_conductive_rubber (DIY Rubberband Potentiometer)
http://www.youtube.com/watch?v=kK94lLZV1qg (DIY Salt Potentiometer)
http://www.youtube.com/watch?v=7rVt2EMk_GM (DIY Foot Pedal Potentiometer)
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