I used conducting foam, as used for the static protection of electronic components, as inputsensors to drive servo's. In this case I used 2 servo's but it's possible to use more. The Arduino sketch is the one that comes with the Arduino compiler (servo-knob) but the code is doubled for , in this case, 2 servo's and sensors.
As an original stretch sensor will cost 19 Euro's, you can save lots of money making them yourself in this way.
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