Subject:
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Re: Og Needs More Inputs (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 1 May 1999 13:13:22 GMT
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Original-From:
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Jim Choate <RAVAGE@SSZ.stopspammersCOM>
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Viewed:
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1070 times
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----- Forwarded message from Michael Gasperi -----
From: "Michael Gasperi" <gasperi@alynk.com>
Subject: Re: Og Needs More Inputs (fwd)
Date: Fri, 30 Apr 1999 12:43:52 GMT
In lugnet.robotics, lego-robotics@crynwr.com (Jim Choate) writes:
> Perhaps I've misunderstood how that angle sensor works. I was under the
> impression it was a simple pot (ie analog), are you saying it is actualy
> some sort of R-ladder that is switched depending on the angle (ie perhaps
> with a ring-slider mechanism)?
It is an optical (I think) incremental encoder where the 2 quadrature bits are
converted to analog values. There is a pretty good description of the LEGO
rotation sensor on my web page and also plans for a homebrew version that works
about the same as the LEGO sensor. It is not as simple as a R-ladder, but
pretty close.
----- End of forwarded message from Michael Gasperi -----
Thanks for the feedback.
The easiest way to do incremental encoding is to take your two bits of data
(since we are talking 4 voltage levels) and run them to a R-2R ladder. It's
the basic idea behind D/A conversion. Now whether it does the D/A this way
or another isn't relevant. What is relevant is the voltage is one of 4
levels. This is less than the 8 levels the RCX can detect. So there is
plenty of latitude to use the 4 unused levels for something else.
____________________________________________________________________
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Anonymous
The Armadillo Group ,::////;::-. James Choate
Austin, Tx /:'///// ``::>/|/ ravage@ssz.com
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Did you check the web site first?: http://www.crynwr.com/lego-robotics
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