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Have you thought about using a piston instead of the servo?
can I use an electret microphone with amplifier(https://www.adafruit.com/products/1063) to get an audio reading instead of the microphone and circuit?
Weave Your Own Conductive Fabric
How to Solder Without Electricity (or a Soldering Iron)
Home made robot gripper
Stair Climbing Robot
Motion Detection Alarm System
Designing and Testing an Electromagnetic Braking System
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