Subject:
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RE: #5120 Polarity Switch: cheap shaft encoder/rotation sensor?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 23 Jan 2000 15:23:30 GMT
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Viewed:
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982 times
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> If you remove the lever from the polarity switch you can insert an axle through
> the switch which will cycle the switch continuously between fwd/off/rev/off.
> Since most of the tension in the switch is actually provided by the lever slot,
> this axle can turn pretty freely.
<snipped description of polarity/rotation sensor>
Ben,
I think that the polarity switch is one of the most underused
Technic/Train elements. The fact that it switches polarity as
well as providing an off period is probably due to a break-before-make
switch arrangement to prevent shorting batteries, but it sure
is useful.
See my pneumatic limit switch for an example...
<http://www.hempeldesigngroup.com/lego/pressureswitch/index.html>
Cheers,
Ralph Hempel - P.Eng
--------------------------------------------------------
Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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