Subject:
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Sensor Resistance Readings and Circuit Descriptions
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 2 Feb 2005 22:26:15 GMT
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Viewed:
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1159 times
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I’ve added a graph of RCX/Cybermaster sensor resistance vs raw reading to my
brickshelf gallery:
There are 3 lines on the graph, with the resistance values on a log axis. The
blue plusses are the actual readings. The pink triangles are a first
approximation to a cosine curve and the green crosses are a closer approximation
with more trigonometric functions in the formula.
This shows the useable range of resistance values being about 100k to 1k, with
10k corresponding to a reading of 512, as you would expect with the 10k internal
pull-up to +5V. This helped me choose the resistance values for my passive
switch multiplexer as values significantly over 10k, so that the parallel
combinations of values would be near to 10k, taking advantage of the maximum
slope on the graph and therefore the furthest spacing of readings, to make
distinguishing each combination of switches easier. I might post the
multiplexer circuit soon.
Also, here is a link to the descriptions of some of the circuits I’ve drawn from
my RCX investigation:
http://www.brickshelf.com/gallery/mbellis/Technic/Mindstorms/RCX-Internals/rcx_circuit_descriptions.txt
PLMKWYT
Mark
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