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 21:27:32 GMT
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Viewed:
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887 times
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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.
> 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
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Message has 2 Replies:
 | | Re: Struggling with encoder wheel
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| Hello, (...) What is Lego made out of? ==> ABS plastic What can you buy in sheets with the same thickness as Lego? ==> ABS plastic So what I would do if I were you is go to a modelbuilder's supplier and ask for a sheet of ABS of 1.5 (?) mm thick. (...) (23 years ago, 12-Apr-01, to lugnet.robotics)
| | | Re: Struggling with encoder wheel
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| (...) 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 (...) -- See my Visual Interface for leJOS at (URL) (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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| (...) 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. Do you really need to know the direction (...) (23 years ago, 12-Apr-01, to lugnet.robotics)
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