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Knitted stainless steel as a cheap sensor

Some of these sensors are pretty expensive, but you can also make nice sensors yourself by examining different properties of cheaper materials: if you stretch some knit stainless steel, it will become more conductive due to each row making better contact. You can make squishy switches by putting some aluminum foil on either side of a sponge with some holes. It all depends on the projects you want to be doing...

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