Subject:
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RE: LEGO light sensor schematic
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 2 May 1999 00:03:18 GMT
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Viewed:
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1277 times
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> Well I couldn't wait. I broke down and broke into my Light sensor. All I can
> say is don't do it! The guy that figured out how to package this thing must
> wear a straight jacket. You will break things getting it open.
>
> Other than the already talked about upside down diodes, I found 2 pin numbers
> on the Opamp were switched and that was it. I think it is all correct now. I
> fixed up the circuit and added some measured voltages to make things clearer.
> There is a little analysis added below the circuit for how I think it works.
>
> I'd forgive this much complexity if it actually worked better, but I'm not all
> that impressed with it. It never goes down much below 20 and who cares how
> linear it is.
>
> http://www.plazaearth.com/usr/gasperi/light.htm
HaHa, I was so busy getting the next release of pbFORTH out that Michael
beat me to it. Anyways, good work! I have a little fix to extend the range of
the light sensor in % mode that involves blocking the light that comes
from the emitter. See:
<http://www.bmts.com/~rhempel/lego/lightsensor/default.html>
for details. I've got a %range of 6 (in a box) to 95 (pointing at a halogen
desk lamp 5' away) Your mileage may vary, but give it a try!
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.bmts.com/~rhempel/lego/pbFORTH/default.html>
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Reply to: rhempel at bmts dot com
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Message is in Reply To:
 | | Re: LEGO light sensor schematic
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| (...) wrong with it for me so I wouldn't have to. Well I couldn't wait. I broke down and broke into my Light sensor. All I can say is don't do it! The guy that figured out how to package this thing must wear a straight jacket. You will break things (...) (25 years ago, 1-May-99, to lugnet.robotics)
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