There are lots of ways to make homebrew pressure sensors, but this method from Instructables user hiskeyd is the easiest I’ve seen: Jam two stripped wires into a piece of static dissipative foam and bend the ends over to keep them from pulling out. Then coat the whole thing in Plasti-Dip. And you’re done.
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I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c't – Magazin für Computertechnik, and The Wall Street Journal.
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