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 19:27:12 GMT
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Original-From:
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FIRSTCOOL@AOL.COMspamless
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Viewed:
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918 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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Message has 2 Replies:
 | | Re: Pneumatic valve mystery
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| (...) When you say it "misses a command", do you mean that you don't get the touch sensor pressed once in a while? Or the motor doesn't turn when you want it to? If it is the touch sensor issue, maybe the round brick+boat plate that are not close (...) (21 years ago, 26-Dec-03, to lugnet.robotics)
| | | Re: Pneumatic valve mystery
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| (...) I suspect you're having problems with indeterminate values in the whichPosition variable. This might happen due to the SensorListener getting called in the middle of one of the tests for your while loops... or it might have some other cause. (...) (21 years ago, 26-Dec-03, to lugnet.robotics)
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