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MERL – TR2003-035 – Very Low-Cost Sensing and Communication Using Bidirectional LEDs edit / delete
This is very cool -- how to use LEDs as photodiodes, which means that you can treat an LED as a short-distance IO port. Tagged research because there are obvious robotics applications...
to communications electronics networking pervasive research ... on 22 February 2006
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tasty by Adam Sampson.