Subject:
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Re: pneumatic switch control
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 23 Apr 1999 11:10:12 GMT
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Original-From:
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S. Crawshaw <SC10003@ENG.nospamCAM.AC.UK>
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Viewed:
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1091 times
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On Thu, 22 Apr 1999, Dennis Clark wrote:
> > > Now I need to find a way to control two or more pneumatic switches with a
> > > single motor, in both directions!
To connect the motor to the switch, use a piston arrangement (like a car
engine). This can be done quite compactly. A single touch/light sensor and
medium pulley wheel can be used to count motor revolutions (to determine
when you've gone from one position to the next)
... Now, attach a second piston arrangement at 90 degrees to the first.
Then you get the following four combinations:
"position" switch 1 switch 2
90 deg off forward
180 deg forward off
270 deg off backward
360 deg backward off
The only drawback is that one (*and only one!*) of your two pneumatic
cyclinders will be "active" at any given time ... but that is possibly not
a problem?
With one motor you're not only restricted to cycling one way (ie you can
get from any switch 1 position to any switch 2 position with one movement)
Alternatively, if you can accept cycling, then use a diff. to use motor
forward and reverse separately - hey presto: one motor can control 4
pneumatic switches :-)
I've tested the switching side of this (ie without the touch sensors) and
it definitely can be done in a reasonably compact way. No pictures though
- sorry :-(
Stuart
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: pneumatic switch control
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| (...) Rather than that, how about triggering one switch automatically at the end of travel of the other? For instance, you won't dump your bucket on the front end loader until it is a max height. Have the motor control the lift are with a sensor (...) (25 years ago, 22-Apr-99, to lugnet.robotics)
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