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 23:36:18 GMT
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Viewed:
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1008 times
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hi Chris,
Chris Osborn wrote:
> In article <3AD6C92D.5C9AD92D@yahoo.com>,
> Andy Gombos <gombos_2000@yahoo.com> wrote:
> > You could build a rotation sensor found on Michael Gaspari's site, using a
> > magnetic strip. It is supposed to give 40 or so counts per revolution.
>
> Yah, but if I'm gonna build my own sensors, there's a lot I could
> do. I'm sort of a purist. I'm trying to stick with the stock sensors
> so that most people can build a copy of my system. Printing out
> something on a printer and gluing it to cardboard is something most
> people should be able to do, without having to buy a bunch of special
> things and special tools.
That's in fact a good principle.
Isn't it possible to improve the dynamic range of the light-sensor by taping the red LED, I read that somewhere but I don't know where.
Why not use a continuous grayscale, with pure with and black holes in it to get a continuous calibration ?
Or translate you rotation in a linear movement en using a pure black and white wedge ?
I've plans for several rotation sensors, but they will not meet your criteria ;-), here are some of mine ideas
- using a 10-turn trim potmeter (continuous, low friction, over 360 degrees, small)
- Hall sensor with a concentric moving magnet (continuous, no friction, 360 degrees)
- opto-transmittor with a rotating vane
- grayscale with calibration by using 2 or 3 detectors (inspired by you idea)
>
> --
> 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
Stef Mientki
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Message has 1 Reply:
 | | Re: Struggling with encoder wheel
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| As I am not so purist, I think that an angle sensor based on a small potentiometer (There's a description on Michael Gaspari's site) would be the simplest solution... But your absolute encoder is a challenge in itself! What about using two (...) (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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| (...) Yah, but if I'm gonna build my own sensors, there's a lot I could do. I'm sort of a purist. I'm trying to stick with the stock sensors so that most people can build a copy of my system. Printing out something on a printer and gluing it to (...) (23 years ago, 12-Apr-01, to lugnet.robotics)
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