Subject:
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Re: Struggling with encoder wheel
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Apr 2001 21:24:11 GMT
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Viewed:
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886 times
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In article <GBoMIu.Fv@lugnet.com>, Dean Hystad <dean.hystad@mts.com> wrote:
> I was wondering how you were handling the edge conditions. Have you tried
> making a wheel which is a continuous gradiant from black to white over the
> 360 degrees of rotation? Lookup wouldn't be required as there would be a
> direct relationship between the sensor reading and the encoder wheel position.
The light sensor just doesn't have that kind of resolution. I'd never
get a very accurate position by doing that, I wanted a finer
positioning system than I can get from using a rotation sensor.
I'm trying to build something that's got relatively fine control, as
well as a high degree of repeatability. I want to be able to tell the
camera to go to a certain position and know that it's going to go
there and not tangle up my cables.
> Another idea would be to go back to your incremental encoder wheel with the
> black and white stripes and to add a home switch.
That's taking a step backwards, since that was exactly how the version
before this one worked. The problem with it was that misreads couldn't
be detected until the camera was turned all the way to the limit
switch.
--
Chris Osborn Full System, Inc.
fozztexx@fullsystem.com 2160 Jefferson St., #240
http://www.fullsystem.com/ Napa, CA 94559
Webhosting that *works* - 99.99% uptime - First 3 months free
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Message has 1 Reply:
 | | Re: Struggling with encoder wheel
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| (...) I did an experiment printing out many different gradients and I now understand part of your problem. It was hard to get any change in the reading (~40 - 50). So next I then cut a wedge shaped slit in a piece of white paper. Aiming the sensor (...) (23 years ago, 13-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: Struggling with encoder wheel
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| (...) I was wondering how you were handling the edge conditions. Have you tried making a wheel which is a continuous gradiant from black to white over the 360 degrees of rotation? Lookup wouldn't be required as there would be a direct relationship (...) (23 years ago, 12-Apr-01, to lugnet.robotics)
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