Very Low-Cost Sensing and Communication Using Bidirectional LEDs

  title={Very Low-Cost Sensing and Communication Using Bidirectional LEDs},
  author={Paul H. Dietz and William S. Yerazunis and Darren Leigh},
A novel microprocessor interface circuit is described which can alternately emit and detect light using only an LED, two digital I/O pins and a single current limiting resistor. This technique is first applied to create a smart illumination system that uses a single LED as both light source and sensor. We then present several devices that use an LED as a generic wireless serial data port. An important implication of this work is that every LED connected to a microprocessor can be thought of as… CONTINUE READING
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