Subject:
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(no subject)
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 28 Dec 1998 04:37:44 GMT
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Original-From:
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[MwalimuB@aol.com]saynotospam[]
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Viewed:
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1138 times
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After reading Dave's commentary on the RCX's ADC system, I did a few more
test's, and found that I could easily predict the value that the RCX would
produce for a given resistor. Just use the voltage divider formula - V=R2 /
(10,000 + R2) and multiply your result by 1023. My table for multiple sensors
would be as follows:
A=10K B=22K C=33K
A=512(10K) AB=417(6875 ohms) ABC=371(5690 ohms)
B=703(22K) AC=444(7674 ohms) no closures = 1023
C=785(33K) BC=582(13200 ohms)
This is of course all theoretical - I have to build it.
chris
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Message has 1 Reply:
 | | Re: (no subject)
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| (...) Wouldn't the resultant reading be: value=1023/(10000*(sum (Si/Ri)) + 1) where Si is 1 if Switch i is closed and 0 otherwise and Ri is the value of the resistor attached in series with Switch i Inversely, sum(Si/Ri)=(1023-V)/(10000*V), but (...) (26 years ago, 29-Dec-98, to lugnet.robotics)
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