LED as photodiode

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http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=15980

Did anyone download the code for this? The link doesn't seem to work.

C. H.
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It's only waste if you don't use it!

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Sorry, I don't have the code for you. But, try looking at this article Very Low-Cost Sensing and Communication Using Bidirectional LEDs, which gives more detail on the method.

If you are willing to use the ADC, you can get some code from my write up: Sensing light with an LED. Good luck.