Subject:
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More input
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 28 Dec 1998 03:39:18 GMT
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Original-From:
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MwalimuB@aol.com!nospam!
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Viewed:
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1239 times
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After realizing that the input ports read resistance, I had an idea. Suppose
that I used a network of switches and parallel resisters to differentiate
between switches? Here's the circuit I have in mind:
gnd-----+--[22k]------ switch --+ A
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+--[15k]-------switch----| B
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+--[10k]--------switch---| C
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input input
port port
The combinations of possible switch closures are:
A - 22,000 ohms Formulas - 2 resistors in parallel -
B - 15,000 ohms (R1 X R2) / (R1+R2)
C - 10,000 ohms
AB - 6,000 ohms 3 resistors in parallel -
AC - 6,875 ohms 1 / (1/R1 + 1/R2 + 1/R3)
BC - 8,919 ohms
ABC- 4,714 ohms
I haven't determined the values for various resistance's, but I did get 509 as
a RAW value for a 10K ohm resistor, while 33K gave me a RAW value of 145. I
obviously need to investigate some more and build my circuit.
chris
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Message has 2 Replies:
 | | Re: More input
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| A similar scheme can be found at: (URL) Just go to the section about dealing with only three inputs. Mike G. (26 years ago, 29-Dec-98, to lugnet.robotics)
| | | Re: More input
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| Check the URL Mike, I hit a dead end. (...) -- Richard Clemens, Associate Professor Computer Science Department West Virginia Wesleyan College 59 College Avenue, Buckhannon, WV 26201 304-473-8421 clemens@wvwc.edu -- Did you check the web site (...) (26 years ago, 29-Dec-98, to lugnet.robotics)
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