There are some Dr. Scholl's commercials showing their "foot-doctor-o-matic" station that measures the pressure your feet put down on a mat then tells you what insoles to buy. How does the thing actually work; what sort of component is able to translate an array of force across a plane into electronic signals? If the thing cheats and uses temperature, the question still stands; how can I record an array of pressures across a plane?
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