Led sensor: Difference between revisions
From ArmadeusWiki
No edit summary |
No edit summary |
||
| Line 3: | Line 3: | ||
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. | ||
= Code = | |||
[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 :
