Subject:
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RE: RCX 2.0 -- ideas.
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 31 Dec 1998 20:20:13 GMT
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Original-From:
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Tilman Sporkert <tilman@nscale=nomorespam=.activesw.com>
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Viewed:
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1272 times
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> By the way, how can they drive a motor and receive feedback from
> it 50 times per rotation using only two wires ??? (have I seen
> this wrong?)
I believe another message already clarified that there are more than two
wires involved.
However, it is technically possible to do this with two wires. If current
stops flowing through a coil (like in a motor, when it rotates around), you
get a reverse spike generated from the collapsing magnetic field. That's
called Back-EMF. This happens a couple of times per motor rotation, and can
be detected. It is used in some model train command control systems to
achieve constant motor speed and very fine low speed control, independent of
load.
Of course, you would not be able to detect rotation if somebody turns the
motor by hand.
Tilman
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: RCX 2.0 -- ideas.
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| (...) I don't think they are willing to change the main processor (and all the software involved) just to accomplish this... unless there are another versions of the H8 that have more inputs/outputs (?) (...) RCX is HUGE? You should see a (...) (25 years ago, 31-Dec-98, to lugnet.robotics)
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