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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Sat, 1 May 1999 23:33:34 GMT
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Viewed:
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1105 times
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> > I was kinda hopeing some bright guys like you would figure out what was
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 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
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Message has 1 Reply:
 | | RE: LEGO light sensor schematic
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| (...) 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. (...) (25 years ago, 2-May-99, to lugnet.robotics)
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Message is in Reply To:
| | RE: LEGO light sensor schematic
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| (...) OK. I'll take a closer look - my previous description was a broadbrush attempt. Cheers, Ralph Hempel - P.Eng ---...--- A picture is worth a thousand words, but very few sets of a thousand words can be adequately described by a picture... (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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