Subject:
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Re: Removing red led from light sensor..
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 10 Jun 1999 21:02:20 GMT
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Viewed:
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1267 times
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Jeff Blaine <jblaine@shell2.shore.net> wrote in message
news:slrn7lvneh.n11.jblaine@shell2.shore.net...
> Actually, I heard about this (the beam in front of the red LED) a few
> months ago and my first reaction was, "Well, given that the problem
> (as I understand it) is that the red LED bleeds light internally over
> to the sensing LED side and that causes the loss in range, wouldn't
> placing a beam right in front of the light just cause even MORE bleeding
> (reflection) back into the whole unit?"
A simulation of the LEGO Light sensor circuit I did in PSpice showed that
the sensor wouldn't read down to zero just because the way the LED interacts
electrically. There is some light bleeding effect, but it wouldn't go to
zero even if you covered the LED totaly with black material. Bleeding is
probably less than half the problem of reading in the dark.
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Message is in Reply To:
 | | Re: Removing red led from light sensor..
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| Actually, I heard about this (the beam in front of the red LED) a few months ago and my first reaction was, "Well, given that the problem (as I understand it) is that the red LED bleeds light internally over to the sensing LED side and that causes (...) (25 years ago, 10-Jun-99, to lugnet.robotics)
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