Subject:
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Re: Shaft Encoders
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 2 Apr 1997 01:45:23 GMT
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Original-From:
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MAR ERICSON <MAR@COOPER.avoidspamEDU>
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Viewed:
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1567 times
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One of the advantages of using a shaft encoder is:
For you to get the same "resolution" as a shaft encoder with a
potentiometer, you must have a very precise pot. Some optical encoders can
have 500 "ticks".
But... a normal encoder does not tell direction. You need a quadrature
encoder. This encoder is actually two encoders out of phase so you can
tell direction by the leading edge signal (whether its from one or the
other encoder). An absolute encoder tells position (like a pot). This is
accomplished by having a few channels making a binary number for example.
Thus you have to use alot of inputs. So this is the sacrifice.
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
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On Tue, 1 Apr 1997, victor w clark wrote:
> Does anyone see a problem with using the pot thats built in a RC servo as
> its shaft encoder.
> I have modified it so that it makes contact once every revolution.
>
> Would this mechanical contact create any "bounce" that would interfere
> with the enoding ticks.
>
> What would be the advantage in using optical encoders?
>
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Message is in Reply To:
 | | Shaft Encoders
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| Does anyone see a problem with using the pot thats built in a RC servo as its shaft encoder. I have modified it so that it makes contact once every revolution. Would this mechanical contact create any "bounce" that would interfere with the enoding (...) (27 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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