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 22:28, 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
How that work ?
Results
With a green standard led that give :
