Difference between revisions of "Led sensor"
From ArmadeusWiki
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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]] | [[Image:ledtouchschema.png|300px|center]] | ||
| + | = Results = | ||
| + | |||
| + | 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 :
