----- Original Message -----
From: "Thomas McGahee" <tom_mcgahee@SIGMAIS.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, December 19, 2000 2:40 PM
Subject: Re: [PIC] Sssssssssssmokin'


> I have made quite sensitive smoke detectors using a RED LED as the
> light source and another RED LED as the detector.
>

I was not aware that a LED could _detect_ light. How can this be?

Mark

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