Subject:
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Pneumatic valve mystery
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Dec 2003 19:59:02 GMT
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Original-From:
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FIRSTCOOLBREEZE@COMCASTavoidspam.NET
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Viewed:
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1075 times
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I am a novice robot builder and programmer who needs some help with a random problem that affects a pneumatic system I have built.
I want a general purpose basic pneumatic system that can be programmed to use any of the three positions of the pneumatic valve. I modified the Brian Alano valve control design by adding a revolving drum (I think Lego calls it a "round brick") that hits a touch sensor as the valve moves between the three positions. Details are at http://home.comcast.net/~firstcoolbreeze/Pneumatic/PneuValve.htm
I suspected that there may be some accumulated error in the hardware so I devised a test that would run the valve between the positions hundreds of times and perhaps gather some useful information along the way.
My problem is a mystery behavior where the system misses a command. This has happened on the very first cycle; the most cycles without the mystery behavior is 129. It appears to be random.
I have tried various debugging tricks with sounds and the LCD display and cannot pinpoint the cause of the failure. I would appreciate any advice from more experienced builders/coders on whether my problem is with the hardware or software. The hardware is a bit of a kludge, since I wanted to test the basic technique before rebuilding it. I think I can make it more compact and easier to see in photos, and will try that route while awaiting comments.
Thanks.
Walt White
firstcool@aol.com
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