Squirrels have fuzzy tails.
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You can also use it a switch!!! That's an old trick!!!You simply light the led and then turn it off and mesure the ADC readings... Should the light being emmited being reflected back to the led the ADC reading would higher than half...This is due to the ability the Led has to conver light to voltage!!!Don't expect much current only some mA but there 're enought to trigger the ADC!!!
http://mvh.sr.unh.edu/mvhinvestigations/light_investigations.htm