some possible applications & tips related use of LEDs
as detectors ...enjoy!


regards
Marco


Very Low-CostSensing and Communication Using Bidirectional LEDs  

http://www.merl.com/publications/TR2003-035/ 


Using Inexpensive LEDs as Optical Detectors  

(http://www.sensorsynergy.com/helpfulhints.htm)


Low-Cost Surface Mount LED Gas Sensor

http://www.merl.com/papers/docs/TR2005-097.pdf )


Novelfused-LEDsdevices as optical sensors for colorimetric analysis 

http://www.merl.com/papers/docs/TR2003-150.pdf  )





---------- Initial Header -----------

>From      : piclist-bounces@mit.edu
To          : "Microcontroller discussion list - Public." piclist@mit.edu
Cc          : 
Date      : Wed, 22 Nov 2006 10:23:27 +0000
Subject : [PIC] LED as a light measurements







> Hi Everybody,
> 
> Someone of you mentioned that an ordinary led can be used as a light sensor.
> How sensitive is that? How fast is it -- I mean can be it used as a test
> measurement device for a really fast movements (sometimes nearly as fast as
> the speed of sound). Which colour is the best for this (in terms of more
> sensitive, more response). And finally as far as I know it gives a very
> small signal you can measure, so would you use a simple analogue amplifier
> to attach it to the PIC?
> 
> Thanks,
> Tamas
> 
> 
> -- 
> unPIC -- The PIC Disassembler
> http://unpic.sourceforge.net
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