Subject:
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Voltage or resistance
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 27 Dec 1998 21:36:46 GMT
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Original-From:
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MwalimuB@!spamcake!aol.com
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Viewed:
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1228 times
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After experimenting with various photo sensors, it appears that resistance is
what is measured. Solar cells produce no change in readings, but CdS photo
resisters do.
I managed to hook up a BASIC STAMP (a small microcomputer by Parallax) to one
of the input ports using an LED (using pulse width modulation to vary
brightness) and a photoresister. The idea is to use the light input to signal
changes in the STAMP - perhaps touch sensors - the STAMP has 7 inputs left
over.
The problem is that the readings on the RCX fluxuate too much. I figure that
with some creative programming, I might can get 3, maybe 4 identifiable
readings. I'll look for an octocoupler that uses resistance. Maybe that will
give me a more stable reading.
chris
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Message has 1 Reply:
 | | Re: Voltage or resistance
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| I'm joining this thread a little late, so sorry if any of this has already been stated... For "passive" sensors, the RCX measures a voltage level, but since there's a pullup you may not get what you expect. If memory serves, the RCX ADC uses a 5.0V (...) (26 years ago, 27-Dec-98, to lugnet.robotics)
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