Electronics > Projects, Designs, and Technical Stuff
Magic LEDs
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wholder:
I've posted a YouTube video that shows how to program an Arduino to “Magically” switch an LED on and off by shining a keychain light at it. 

   

The video describes how the technique works for one LED as well as for a set of 8 LEDs, each of which can be switched on and off independently.  There also a bonus effect shown at the end of the video.  Complete source code is available for all 4 examples and can be downloaded from a web page that’s linked in the description for the video.  Enjoy!

Wayne
chris_leyson:
Thanks Wayne that's really neat. It would never have occurred to me to use a LED's junction capacitance to measure ambient light so I've learnt something new today, thanks. Given your YouTube video a thumbs up.
cdev:
Miraculoso!
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