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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Fri, 13 Apr 2001 09:38:53 GMT
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Original-From:
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Andy Gombos <gombos_2000@%spamcake%yahoo.com>
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Viewed:
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1099 times
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Chris Osborn wrote:
> In article <3AD63F39.C44D51A2@yahoo.com>,
> Andy Gombos <gombos_2000@yahoo.com> wrote:
> > You could make a big wheel made of lego plates, and put smooth ones
> > on top for 'colors'. Then you could use a touch sensor, and use the
> > difference between the low spots and the high spots as 1 location.
>
> I thought about something like that, but using 2 wheels and 2 touch
> sensors, not just one, and using my 2 bit encoding system like on the
> light sensor wheel. But I'm not sure how to build small round things
> out of Lego that have 36 divisions at even points around them. I
> thought about using a cardboard disk, but I decided it would bend too
> easily after just a little use and the touch sensors wouldn't detect
> it correctly.
>
>
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.
Andy
> > Do you really need to know the direction that the wheel is going?
> > You know that for a given motor direction, the wheel will rotate a
> > given way due to the gears. Use the sensor edge count mode to count
> > both -_- and _-_ edges, and get 2x the resolution (?).
>
> The direction of rotation isn't what I'm trying to detect, it's the
> position that I'm actually at. I want to know that I'm where I'm
> supposed to be without having to reset with a limit switch each time
> and count back to where I want to be.
>
> --
> 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
--
See my Visual Interface for leJOS at http://lvi.sourceforge.net
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Message has 1 Reply:
 | | 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 (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: Struggling with encoder wheel
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| (...) I thought about something like that, but using 2 wheels and 2 touch sensors, not just one, and using my 2 bit encoding system like on the light sensor wheel. But I'm not sure how to build small round things out of Lego that have 36 divisions (...) (24 years ago, 12-Apr-01, to lugnet.robotics)
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