Subject:
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Re: Navigation using landmarks (Was: Re: lasers and RCX)
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 1 Jul 2002 20:09:00 GMT
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Original-From:
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Mike Payson <mpayson@/spamcake/dawgdayz.com>
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Viewed:
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1801 times
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Just use the bottom half of the mouse, trimmed as much as possible, as a
skid plate. It will need to be mounted to allow vertical movement, but it
should work alright. This wouldn't solve the spin issue, but the clearance
shouldn't be a problem. A nice side benefit is that this simplifies
construction since you don't need to worry about mounting the optics, etc..
At 02:31 PM 6/30/02 -0400, Rob Limbaugh wrote:
> I'm certain that the optics need to be insanely close to the surface they
> are monitoring, causing a clearance problem.
>
> If such a device was hacked, would placing it in the center of a synchro or
> Killough platform prove useless in a spin?
>
> Rob
>
> >
> > > Does anyone know how they work and where to get the chips?
> >
> > Well, where you get the chips is you pull apart a mouse these mice are • pretty
> > cheap these days. The software and control logic is all inside the • mouse - they
> > don't have any special drivers in the PC. Hence, the protocol is the • usual mouse
> > protocol that's well documented all over the web.
> >
> > How they work - well, I can only presume that they are watching an image
> > of the desktop under the mouse and doing some kind of signal processing
> > to derive the speed and direction of motion. This is confirmed by the
> > fact that these things don't work on very smooth, plain-coloured surfaces,
> > and expecially on very reflective surfaces (where the mouse tries to track
> > an image of it's own underside!).
> >
> > Dunno how accurate they are - in their intended application, they can
> > mis-estimate the mouse speed considerably and still work well.
> >
> > ----------------------------- Steve Baker -------------------------------
> > Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
> > URLs : http://www.sjbaker.org
> > http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
> > http://prettypoly.sf.net http://freeglut.sf.net
> > http://toobular.sf.net http://lodestone.sf.net
> >
> >
>
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Message has 1 Reply:
 | | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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| (...) Yes - I was thinking of some kind of spring-loaded arm pressing the mouse's underside against the ground. (...) For a Killough platform, you have a fundamental problem. That type of drive has three degrees of freedom (well - it *ought* to have (...) (24 years ago, 9-Jul-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Navigation using landmarks (Was: Re: lasers and RCX)
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| (...) <blush> (...) Well, where you get the chips is you pull apart a mouse these mice are pretty cheap these days. The software and control logic is all inside the mouse - they don't have any special drivers in the PC. Hence, the protocol is the (...) (24 years ago, 29-Jun-02, to lugnet.robotics)
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