Subject:
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Re: CdS cells
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 5 Aug 1997 17:40:30 GMT
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Original-From:
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Richard Drushel <DRUSHEL@APK.avoidspamNET>
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Viewed:
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1637 times
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[David.J.Dostal@lawrence.edu] spake unto the ether:
> I am looking to purchase a batch of CdS photo cells but I think that I
> need more information before I order. The catalogs (Digi-Key, Mouser, etc.)
> list several different photocells (different resistances, power dissipation,
> etc.) and I am wondering which one is optimally suited to be used as a light
> sensor on the HB.
I just ordered some from Mouser, the smaller of the two physical
sizes they have, 3K to 100K I believe are the light/dark resistances.
These give analog(PORT) values of about 10 in ordinary fluorescent-lit
room and 225 in complete darkness. These are physically a nice size as
well because with a *slight* enlargement with a handdrill, they fit
perfectly inside the hole in a LEGO beam. I mount them in the 1x2 beam
with a LEGO half-pin as a grommet/strain relief for the exiting wire,
and a LEGO grey pin sawn in half as a tubelike shield. This makes a
great classroom "standard sensor" package.
*Rich*
--
Richard F. Drushel, Ph.D. | "Aplysia californica" is your taxonomic
Department of Biology, Slug Division | nomenclature. / A slug, by any other
Case Western Reserve University | name, is still a slug by nature.
Cleveland, Ohio 44106-7080 U.S.A. | -- apologies to Data, "Ode to Spot"
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Message is in Reply To:
 | | CdS cells
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| hi everyone, I am looking to purchase a batch of CdS photo cells but I think that I need more information before I order. The catalogs (Digi-Key, Mouser, etc.) list several different photocells (different resistances, power dissipation, etc.) and I (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
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