Subject:
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Re: Chaining multiple RCX's output to input
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 27 Oct 1999 17:25:56 GMT
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Original-From:
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Issac Merkle <the_gaff@(nomorespam)hotmail.com>
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Viewed:
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2014 times
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> Using a motor as a tachometer has come up before and I used to be worried
> about this causing damage.
SNIP
> The reason it
> appears to only work in one direction is the inputs only work with the
> voltage in one polarity. When you spin the motor in one direction it
> generates a positive voltage and negative when you spin it backwards. The
> RCX can't measure negative voltage.
One could use four diodes (as a bridge rectifier) between the motor and the
input port, and achieve tachometer functionality in both directions, though
without direction sense, methinks...
Regards,
Issac.
[Dexter]
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