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 22:32:35 GMT
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Viewed:
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1227 times
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In lugnet.robotics, Chris Osborn writes:
> In article <GBpz1w.I6C@lugnet.com>, Dean Hystad <dean.hystad@mts.com> wrote:
> > As far as the rotation sensor, you could always use gearing to increase the
> > resolution. Place it on the shaft of a worm gear driving a 42 tooth gear
> > and you get 1 count = 1/2deg (approx). It's not as cool as an optical
> > encoder, but it is robust.
>
> That was the first version of the webcam mount. After rotating back
> and forth a few times you can't tell where the camera is
> anymore. There also aren't any 42 tooth gears BTW, just a 40.
I have noticed the lost count phenomenon also (you attribute it to gear slop
on you web page, but gear slop will give you errors in the 1/2 a tooth range
or less and it doesn't get worse over time). In fact there was a very long
thread about it a few months ago. I came away with the feeling that people
using NQC were having a worse time of it then the legOS folks. To get
around this I usually use a touch sensor to occasionally home the rotation
sensor. It has worked really well for me.
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Message is in Reply To:
 | | Re: Struggling with encoder wheel
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| (...) That was the first version of the webcam mount. After rotating back and forth a few times you can't tell where the camera is anymore. There also aren't any 42 tooth gears BTW, just a 40. Last night I used the datalog to record what the light (...) (24 years ago, 13-Apr-01, to lugnet.robotics)
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