Subject:
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Re: RCX Controlled Air Compressor Tester
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 29 Sep 1999 14:36:33 GMT
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Viewed:
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651 times
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Ray Kelm wrote:
>
> You might want to use a sliding mechanism on the pen to eliminate the
> arc that it draws. It will skew the measurement (no longer quite linear
> scale) but not so badly that it will be useless.
>
> Straightening the lines out will help make the curves easier to compare
> (a square wave would be square).
Thanks,
A sliding mechanism was one of the early failed attempts. It proved too
complicated requiring several linkages.
Actually, it does not really matter that the pen draws an arc rather
than a vertical line because the brain can interpret that it's supposed
to look like a square wave even if the sides are curved.
There's also no need to make elaborate measurements. By superimposing
transparencies of the tracings made by different air compressors, it is
quite easy through pattern recognition, to pick out which is the better
air compressor.
--
C S Soh
cssoh@singnet.com.sg
http://web.singnet.com.sg/~cssoh
...where air is power
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Message is in Reply To:
 | | Re: RCX Controlled Air Compressor Tester
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| (...) You might want to use a sliding mechanism on the pen to eliminate the arc that it draws. It will skew the measurement (no longer quite linear scale) but not so badly that it will be useless. Straightening the lines out will help make the (...) (25 years ago, 28-Sep-99, to lugnet.robotics)
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