Subject:
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Re: 0.5 degree resolution with rotation sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 5 Jun 2000 20:27:55 GMT
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Viewed:
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725 times
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I don't really need it to be really precise, because, yes, the gear train is a
huge factor in a situation like that. I only built the gear train and I'm
using another rotation sensor as the reference for my controller. Depending on
the position I put the 2nd wheel, the controller should move the other one to
the same position. And for that it's working great. I know, I didn't have to
build the gear train for that, but I just wanted to try and see if it was
going to work. After all I just started playing with the RCX and now NQC...
And yep, Mauro, I'm brazilian... :o)
In lugnet.robotics, Mauro Vianna writes:
> Did you have any problem with the slack resulting from the gear train? With
> so much gears the error generated slack should be greater than the
> precision.
> I don't have a rotation sensor yet but some assemblies I made in the past to
> control sterring with touch sensors had this problem. i never solved it. :(
>
> PS: Are you brazilian?
>
> Mauro Vianna
>
>
> "Moleque BR" <molequebr@cs.com> wrote in message
> news:FvG6KM.L30@lugnet.com...
> > Hi guys!
> >
> > I've been playing with a position controller and thought that could • interest
> > someone else.
> >
> > Since the rotation sensor has only 16 counts for 1 full turn, which means • 22.5
> > degrees, I thought about a way to get some more precision.
> >
> > In order to get a 1 degree precision, a 22.5:1 gear train would be • necessary,
> > but then, why not a 45:1 gear train? That causes the input to turn 720 • times
> > for each turn on the output, which gives a 0.5 degrees precision.
> >
> > Here is how I did it:
> >
> > input legend:
> > | | axle
> > [|] sensor # technic beam
> > ###|##|##|###|#### * 8t gear
> > # * *** | | # *** 24t gear
> > # | * *** | # ***** 40t gear
> > # | | * ***** #
> > ###|##|##|###|####
> > |
> > output
> >
> > I hope that will interest you guys, 'cause I'm having fun! :o)
> >
> > Cheers
> >
> > Ricardo Andrade
> > San Jose, CA
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Message has 1 Reply:
 | | Re: 0.5 degree resolution with rotation sensor
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| (...) I did a design a little while ago, using the ultrasonic rangefinder (this is John Barnes's original design 'redesigned' by me, and built as a PCB), as a 'rangefinder', with a meter needle. Obviously to get reasonable resolution on the needle, (...) (24 years ago, 7-Jun-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: 0.5 degree resolution with rotation sensor
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| Did you have any problem with the slack resulting from the gear train? With so much gears the error generated slack should be greater than the precision. I don't have a rotation sensor yet but some assemblies I made in the past to control sterring (...) (24 years ago, 3-Jun-00, to lugnet.robotics)
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