More on LEDs as cheap sensors:

www.merl.com/papers/docs/TR2005-097.pdf 

A low-cost chemical sensor with two SMD Leds and a PIC, used for
colorimetric based gas detection. 

regards
Marco
 

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

>From      : piclist-bounces@mit.edu
To          : "piclist" piclist@mit.edu
Cc          : 
Date      : Thu, 13 Apr 2006 14:11:31 +0200
Subject : Re:[EE] Multi-Touch Sensing through LED Matrix Displays

> 
> Hi,
> this use of leds as sensor remember to me an Application related to Leds used as Optical Sensors (instead of a Photodiode) directly connected to a PIC.
> 
> See this:   www.merl.com/papers/docs/TR2003-150.pdf 
> 
> Some months ago I made a little circuit similar to this (on a 12F629 instead of 16F876) for use as an inexpensive photometer. Interesting results, if "cheap" is the first focus.
> 



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