Subject:
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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 17:04:03 GMT
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Original-From:
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David.J.Dostal@[antispam]lawrence.edu
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Viewed:
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1292 times
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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 am wondering which one is optimally suited to be used as a light
sensor on the HB. Does anyone know enough specs to help me narrow this search
down a bit? I have two cells from Gleason Research's sensor/motor kit and
duplicates of those would work fine if I knew where to order them. Yes, I have
contacted Gleason, but have gotten no reply yet.
Thanks,
David
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Message has 2 Replies:
 | | Re: CdS cells
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| [David.J.Dostal@lawrence.edu] spake unto the ether: (...) 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 (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
| | | Re: CdS cells
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| David, I believe you will want to purchase ones that have a dark resistance more than say 20K. The sensor is part of a divider circuit that includes a 47K resistor. The sensed signal equals (sensor resistance)/(sensor +47K) multipled by 255. If your (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
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