I came across an interesting article yesterday on Hack-A-Day about using a LED as a Photo Sensor and cheap communictaion device.  This is achieved by using some physical properties of the LED for both Transmit and Receive.  The article also links to a cool video clip demonstrating this. Original Article can be found here http://www.hackaday.com/entry/1234000873073550/ Anyway this sparked my interest … Continue reading PICAXE – LED Sensor