Re: gEDA-user: LED in reverse

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Sun, Nov 19, 2006 at 09:22:00PM -0500, Bob Paddock wrote:
> On Friday 17 November 2006 12:05, joeft wrote:
> 
> > ... in general I would say that most LEDs 
> > make lousy capacitors and won't store much charge at all.
> 
> However they do make very cheap light sensors when used that way,
> maybe that is what Karel is after?:
> 
> "Very Low-Cost Sensing and Communication Using Bidirectional LEDs"

I tried LED as a light sensor and the efficiency is absolutely horrible.
A cheap photodiode is orders better.

CL<
> 
> http://www.merl.com/papers/docs/TR2003-35.pdf
> 
> 
> 
> -- 
>  http://www.softwaresafety.net/ http://www.designer-iii.com/
>                  http://www.unusualresearch.com/
> 
> 
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