Subject:
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Re: Position System
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 19 Nov 1998 20:53:45 GMT
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Original-From:
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Scott Furman <fur@netscape.+nospam+com>
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Viewed:
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1782 times
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Neil Harding wrote:
> I was wondering whether anyone has come up with something so that you can
> accurately position your robot in a room. I was thinking about a system
> involving 3 speakers and a tone generator, and a mike. You create a
> circuit that waits for a sound to trigger and then triggers each speaker
> to generate a fixed frequency pulse of say .1 second duration in sequence,
> by measuring the volume using one of the A/D convertors on the RCX, it
> should be possible to triangulate your position. If anyone has any ideas,
> I'd love to hear them.
One possibility is to use inertial navigation. It's not cheap (relative to
the cost of the RCX), but you can get 3-axis accelerometers for less than
$200, e.g. http://www.xbow.com/html/accels/mser.htm
With respect to your idea of using tone generators to triangulate position: It
has been done before and it does work well, but I believe that existing
systems measure phase or delay of an ultrasonic signal, not amplitude. You
might be able to use the components from one of the 3-D pointing devices that
have been on the market in the last few years. See
http://www.cs.utah.edu/~cs672/Kolozs/acoustic/aco1.html
-Scott
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Message is in Reply To:
 | | Position System
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| I was wondering whether anyone has come up with something so that you can accurately position your robot in a room. I was thinking about a system involving 3 speakers and a tone generator, and a mike. You create a circuit that waits for a sound to (...) (26 years ago, 19-Nov-98, to lugnet.robotics)
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