A smart shoe insert? Could have a ton of sensing capability and programmed to your foot, so that you can type with your toes! There’s some obvious details that would need to be worked out, like the interface, what physical electronics would be placed (if any), and of course what kind of sensing capabilities you would want (grid resistive/capacitive/pressure/temperature/etc). The applications of the device are endless! You could make a pedometer on steroids, or maybe some kind calculator that vibrates the answer to you? Haha, yea this is kind of silly, but it just popped in!
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