New Scientist recently detailed the construction materials for the simplest flex sensor I’ve ever heard of – a graphite pencil and a piece of paper. It is obvious when you think about it, but as New Scientist details in in their article Pencil lines as sensors, 21st March 2015 (No 3013) edition,

“MacGyver would be proud. Drawing a rectangle on a piece of paper with an ordinary pencil can create a sensor.”

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