Kerry Wentworth wrote:
>> We have a device with four LEDs, and we'd like to make sure the LEDs=20
>> work.
>> Visual inspection at the factory, proved to be unreliable. Does anyone=20
>> have
>> experience with reasonably priced machine vision systems that can be
>> configured to perform this sort of test?
>>
>> All we want to know, is whether the LEDs turn on and off. Making sure
>> they're the right color is a bonus.
>>
>> Vitaliy
>>
>>
> An LED can be made to detect light.  Put a red LED next to any red LEDs
> on your unit, green next to green, etc.  Make sure that the detecting
> LEDs have colored lenses, even if the LEDs on the unit are clear.

Yeah, I remembered reading an article back in the 1990s about LEDs being=20
used as photodiodes, so we did a bit of experimentation and found that the=
=20
S/N is too low for our application.

Vitaliy=20

--=20
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