Subject:
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Re: Positioning
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 26 Jan 2000 20:53:43 GMT
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Original-From:
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Pete Hardie <pete.hardie@NOSPAMdvsg.sciatl.com>
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Viewed:
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961 times
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David Leeper wrote:
>
> Hi Pete,
>
> Well, here's what I had in mind. I think it can find landmarks beyond the
> visible horizon.
>
> First, instructions are stored in the map.
>
> =-= BEGIN INSTRUCTIONS =-=
> Go until you see a red brick
> Turn left
> Go until you see a green brick
> Rurn right
> Go until you see a black brick
> Stop
> =-= END INSTRUCTIONS =-=
>
> Just like I couldn't see all the trafic lights involved on my trip to the
> store when I first started out, the robot doesn't need to see the red, green,
> or black bricks to start travelling. Just start going! The red brick may be a
> few inches away, it make be 70 yards away. Just go and look for a red brick.
> When you see it, turn left.
>
> David Leeper (can make a left at the next gas station, even if it's 100 miles
> away)
My point is more basic - you can find those traffic lights because you are using
additional info - that they are all located along the 'grid' of roads, and that
if you veer left, you correct when you reach the edge of the pavement (or
gravel,
in some areas...)
The typical legobot, OTOH, is closer to an explorer in the Antarctic - he can
see
only 5 feet ahead, and can't quite walk a straight line. Give him a rope strung
between landmarks, and he can walk it, or make the landmarks bright lights that
he can see through the snow and he can track on it. But without a visible goal
and reliable dead reckoning, he gets lost, wandering in a big circle, until
he finds an abandoned house and ends up in the basement, standing in the
corner.....
--
Pete Hardie | Goalie, DVSG Dart Team
Scientific Atlanta |
Digital Video Services Group |
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Message has 2 Replies:
 | | RE: Positioning
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| (...) And all we get is the footage from the little CCD camera it was carrying.... Cheers, Ralph Hempel - P.Eng ---...--- Check out pbFORTH for LEGO Mindstorms at: (URL) ---...--- Reply to: rhempel at bmts dot com ---...--- (25 years ago, 26-Jan-00, to lugnet.robotics)
| | | Re: Positioning
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| Hi Pete, Those are good points. But I believe they apply to other types of mapping as well. For example, when testing SoftBricks I built a robot that travels a map and if it gets to the desired destination, sends the map to another robot with the (...) (25 years ago, 26-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Positioning
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| Hi Pete, Well, here's what I had in mind. I think it can find landmarks beyond the visible horizon. First, instructions are stored in the map. =-= BEGIN INSTRUCTIONS =-= Go until you see a red brick Turn left Go until you see a green brick Rurn (...) (25 years ago, 26-Jan-00, to lugnet.robotics)
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