Difference between revisions of "Led sensor"

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To test this phenomena , I used to pin of the FPGA, and design a little component that provide the discharging time in a register.
 
To test this phenomena , I used to pin of the FPGA, and design a little component that provide the discharging time in a register.
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= Code =
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[http://fabienmarteau.free.fr/images/synthesis.tar.gz here]
  
 
= How that work ? =
 
= How that work ? =

Revision as of 21:28, 4 August 2008

According to this paper, a simple led can be a light sensor if it used in reverse mode. In fact if led is used in invert, it become a variable capacitance.


To test this phenomena , I used to pin of the FPGA, and design a little component that provide the discharging time in a register.

Code

here

How that work ?

Ledtouchschema.png

Results

With a green standard led that give :

Greenplot.png