Led sensor: Difference between revisions
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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. | ||
= How that work ? = | |||
[[Image:ledtouchschema.png|300px|center]] | |||
= Results = | |||
[[Image: | With a green standard led that give : | ||
[[Image:greenplot.png|300px|center]] | |||
Revision as of 21:31, 3 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.
How that work ?
Results
With a green standard led that give :
