Subject:
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Re: GPS Reality?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 13 Apr 2005 05:18:24 GMT
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Viewed:
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1834 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message
news:4259F6E0.7080405@airmail.net...
> If you are using light and did something like mount a laser on the ceiling
> of the room that scans back and forth across the floor of the room. You
> could broadcast a radio signal continually reading out the position of the
> laser on the floor. Whenever the robot detects laser light shining on its
> roof, it notes the most recently radioed coordinates and knows exactly • where
> it is. This is GPS for robots - but just like real GPS, it dies when you
> drive under a table.
I know of a group of students at the university in my town that have solved
this GPS problem for a limited area. But it also have the problem when the
robot drives under a table or other obstacles. They solved it by mounting a
fixed camera in the roof high above the square arena where the battle took
place. On top of each robot they attached a icon that had a distinct pattern
so that you could both recognize wich robot it was and which direction it
was pointing. Then this camera was connected to a computer that had a
program running that analyzed the image and found the possition and
direction of the robots, it then sendt the possition out on a LEGO RCX Tower
so that every robot could get their possition and direction and the other
bots possition and direction.
There was five bots on the arena, one of them was a "sheep" and the four
others was "dogs" that had each its own home-corner of the arena. The aim of
the contest was to herd the "sheep" (a LEGO robot that was programet to run
away when it was "barked" on) into your home corner while all the other
tried to get the sheep from you and herd it in to their corner.
Some picture of my friends bot can be found here:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=24416
Here is the story from Robo2001 at UiTø (it's only in Norwegian):
http://www.td.org.uit.no/vinduet/vinduet42/robo2001.html
Regards
Øyvind Steinnes
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Message is in Reply To:
 | | Re: GPS Reality?
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| (...) Humans and most animals have evolved to solve this navigation problem. The result isn't 100% perfect (as anyone who ever got lost walking in the woods will tell you). They use their eyes and a continually updatable mental map. That's the ideal (...) (20 years ago, 11-Apr-05, to lugnet.robotics)
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