Subject:
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Re: Using un`Lego sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 29 Jan 2002 19:09:22 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.netSAYNOTOSPAM>
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Reply-To:
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SJBAKER1@AIRMAIL.spamlessNET
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Viewed:
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789 times
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Matthias Jetleb wrote:
>
> > I have two small rotative (circular) potenciometer (variable resistance)
> > from some old headphones, that I'm thinking of using as an angle sensor. It
> > won't measure 360º but it'll be close. I only don't know how accurate will
> > be (or if it'll even work) and what range of raw values will have.
> For what it's worth, there is another type of high-accuracy
> potentiometer which is used primarily in instrumentation. They are
> usually used with vernier dials to set accurate values. Their
> advantage is that, unlike most basic, common potentiometers which have
> a full end-to-end range of motion of about 270 degrees, these
> instrumentation variants rotate 10 complete times (at least the ones I
> have - others may even do more).
The trouble with this (I suppose) is that the precision of the A-to-D
convertor in the RCX is going sharply limit the angular precision
when that number range is 'stretched' over ten revolutions.
I've seen the devices you talk about though - you see them a lot in the
timebase controls of old oscilloscopes.
----------------------------- Steve Baker -------------------------------
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Message is in Reply To:
 | | Re: Using un`Lego sensors
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| (...) For what it's worth, there is another type of high-accuracy potentiometer which is used primarily in instrumentation. They are usually used with vernier dials to set accurate values. Their advantage is that, unlike most basic, common (...) (22 years ago, 30-Jan-02, to lugnet.robotics)
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