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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Thu, 27 Jan 2000 08:54:35 GMT
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Viewed:
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1286 times
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Hi Pete,
I was looking back over you post and realized I didn't answer a couple of your
questions.
> what are the steps leading up to "...when you get to the X..."?
In the program I wrote there are only a few commands. Go forward. Turn left at
landmark X. Turn right at landmark X.
> And how does
> a bot determine that it has not found a landmark and needs to ask more
> directions.
To be honest, I ignored the problem. Although I knew it could happen in
theory, in practice it never did, though I admit it was a limited set of
trials in a static environment. Offhand, I can think of a couple of possible
solutions. 1) Just stop moving after a given time limit or wheel rotation
count. 2) Have a set of landmarks that tell you when your lost, as in "If you
see a McDonalds on your left, you've gone too far." Really, both answers are
the same. Have a mapping system to tell you when you're not correctly
following your mapping system.
Again, I think the major flaw in all mapping systems that I've seen is
the "GO" command. Moving a robot is not acurate and the programmer has to come
up with ways to deal with the inacuracy, whether its a timer system, a
rotation system, or landmark system.
David Leeper (curses "GO")
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Message has 1 Reply:
 | | Re: Positioning
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| (...) The main problem I'm seeing is that the legobot has very short sight, and so it can only travel a certain distance before it is nearly sure to miss a landmark, and then be lost. Also, in the Real World (tm), creatures with the limited senses (...) (25 years ago, 27-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Positioning
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| (...) Some questions I have - what are you using for 'landmark'? How far away can the legobot detect a landmark? When giving directions including a landmark, what are the steps leading up to "...when you get to the X..."? And how does a bot (...) (25 years ago, 26-Jan-00, to lugnet.robotics)
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