Subject:
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Re: mouse
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 25 Jan 1999 00:24:44 GMT
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Original-From:
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Ray Kelm <rhk@newimage.ANTISPAMcom>
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Viewed:
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1260 times
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Quadrature encoding.
Essentially, there are two light sensors on the rotating disk, which are
placed
at distance such that when you rotate one direction, you get the
following two
waveforms:
-- ----
---- ----
---- ----
---- --
and when you rotate the other direction, you get these:
---- ----
-- ----
---- ----
---- --
so one input is used as a clock to signal a motion has occurred, and the
other
input tells what the direction was. If you use the leading edge of input
2, as
the trigger here, then you can see that input 1 is in a different state
for each
of the two diagrams above.
Jasper Janssen wrote:
>
> On Tue, 5 Jan 1999 01:57:33 GMT, lego-robotics@crynwr.com (Virginia
> Campbell) wrote:
>
> > May I suggest looking at the inside of a computer mouse to get an idea
> > of how to let your rotation sensor know which direction the rotation is
> > spinning.
>
> Personally, I've never been able to figure out just jow a mouse does
> that, either :)
>
> Jasper
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: mouse
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| (...) Personally, I've never been able to figure out just jow a mouse does that, either :) Jasper (26 years ago, 23-Jan-99, to lugnet.robotics)
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