Subject:
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Re: optical mouse chips as vision sensors?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 9 Jul 2002 03:16:29 GMT
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Original-From:
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Mike Payson <mpayson@+saynotospam+dawgdayz.com>
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Viewed:
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757 times
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Nevermind... I was assuming it would be mounted to the left or right of center
(thus the rotation would still show up as forward or reverse). After thinking
about it a moment, it occurs to me that by mounting the sensor in front of or
behind the axis rotation will show up as left or right motion.
On Monday 08 July 2002 08:02 pm, Mike Payson wrote:
> On Monday 08 July 2002 09:36 am, Steve Baker wrote:
> > Laszlo Meszaros (ETH) wrote:
> > > Keep in mind that the optical mouse chip detects skidding of the mouse
> > > forward - backward - left - right. When fixed on the bottom of a lego
> > > car it will never send signals about moving left and right. As fine as
> > > I can emulate a lego car-like movement with my optical mouse it sends
> > > only forward and backward movement signals.
> >
> > Right - you only get translational motion - not rotation. However, you
> > could use two of these contraptions - on on each side of the robot (or
> > one on the front and the other on the back) and thus derive the
> > rotational speed from the difference in translational output from the two
> > mouse chips.
> >
> > I think you could also do this correctly with a single sensor (for a
> > typical two-wheel-plus-caster/skid robot) if you mounted it far from the
> > center of rotation of the robot. Then, the lateral motion of the mouse
> > chip would give you a pretty accurate idea of the rotational speed of
> > your robot.
>
> Hmmm... I don't see how that would work. How would a single sensor be able
> to differentiate between rotational movement and straight forward & back
> movement? I suppose you would be able to guess since you would know what
> state the robot was in at any time (turning or straight), but it seems that
> this would introduce a rather large margin of error. Or am I missing
> something?
--
Mike Payson | DawgDayz Dog Walking & Pet Sitting
(206) 280-7295 | www.dawgdayz.com | mpayson@dawgdayz.com
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Message has 1 Reply:
 | | Re: optical mouse chips as vision sensors?
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| (...) Yes - mathematically, you could still do it with the mouse sensor off to the side of the robot (but not with it dead center between the wheels) - however the sensitivity of the chip to small lateral movements probably wouldn't be enough to (...) (22 years ago, 9-Jul-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: optical mouse chips as vision sensors?
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| (...) Hmmm... I don't see how that would work. How would a single sensor be able to differentiate between rotational movement and straight forward & back movement? I suppose you would be able to guess since you would know what state the robot was in (...) (22 years ago, 9-Jul-02, to lugnet.robotics)
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