Subject:
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Re: Robot navigation - barcode stations?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 29 Mar 2001 06:14:18 GMT
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Viewed:
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1428 times
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I think it's an excellent idea... I saw the barcode system being explained
some years ago and I still think it can be the most accurate. One thing
that's different in the system I saw was that there were no LED's used (not
needed...) and it would locate several stations and then use the angle to
them to triangulate it's own position in the 2D plane.... perhaps some trig
lookup tables could be used for this. I don't think the light sensors in
the lego kits are sensitive enough for this though... since your trying to
read the bardcode at quite some distance. You would almost certainly have
to modulate your laser beam and use a bandpass filter and opamp on your
light sensor... there are fairly simple ways of getting the required range
(say 20m for example). But this system could work exceptionally well - just
stick barcodes around the walls in strategic locations, and you can
calculate your 2D position anywhere in the house... I expect the accuracy
could be quite good; you could incorporate more than 3 positions... if you
can lock on to 4 or even 5 barcode at once you can do multiple
triangulations, or pick the one with the most seperated angles to reduce
error sensitivity.
let us know how it goes! I'd be very interested in this one - it's one of
the few systems which should allow for reliable accurate positioning in a
wide area, with a reasonably low cost.
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Message is in Reply To:
 | | Robot navigation - barcode stations?
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| Hi, Some time ago, on this or another robotics list, someone was talking about navigation and location sensing techniques for RCX based robots. After some thinking, reading through the literature and messing with some homebrew sensors I have one (...) (24 years ago, 10-Mar-01, to lugnet.robotics.rcx)
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