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call and response

LEDs can be used to detect light, here two LEDs are trying to get synchronised, if they detect bright light when they are off a number of times, then they 'know' they are synchronised, and the blue LEDs light up to show this.

Randomskk goes further to have a bit of information transferred over the link

Using processing.org as a quick video capture software.

The arduino patch is from www.flickr.com/photos/randomskk/

and google ledcomms for the sourcecode and his youtube video

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Uploaded on September 18, 2008