Subject:
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Re: Autonomous Robot
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 4 Aug 2000 03:11:25 GMT
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Viewed:
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748 times
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>
> > 3) A different landmarking approach could be using a laser beam to query
> > some base stations (if you're open to use a non-Lego laser pointer). The
> > idea is you have a roating laser pointer connected to a motor and a • rotation
> > sensor (multiplied to increase resolution). When the robot wants to
> > calculate its position, it stops and starts slowly rotating the laser • beam.
> > The base stations have a light sensor positioned at the same height of • the
> > laser beam. When the light sensor gets hit by the laser light, it reads
> > almost 100% and the base station transmit an IR message to say "got it".
>
> Almost 100% is an understatement, a laser really saturates a
> light sensor. The problem is hitting it in the first place,
> I found that next to impossible to achieve. I'd rather go
> for some strobe lights (good for identification by rhythm),
> or maybe halogene lights, with the light sensor on the robot
> like scanbot in Dave Baum's book. I also tried candles
> once, but they are to dim, they can be seen only from a
> short distance, on the order of 10cm.
>
> Jürgen
A direct hit is really almost impossible. That's what I found in mosts post
about this matter. But if you aims that in a reflective convex surface, it
will probably hit a light sensor in the emitter but with a smaller
intensity. It's worth a try. Another option is to use those reflectors used
in bycicles that reflects light to the direction of the emitter, no matter
the direction. Again, there is a loss in intensity, but the target is
bigger. I believe I read a post about it once here on this list.
Mauro
> --
> Jürgen Stuber <stuber@loria.fr>
> http://www.loria.fr/~stuber/
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Message is in Reply To:
 | | Re: Autonomous Robot
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| Hi Mario, Mauro, (...) I tried to get away with a single rotation sensor on a differential drive (put it on one of the output), assuming that I one motor is not moving I could deduce total movement. Unfortunately the turning motor drifts slightly on (...) (24 years ago, 3-Aug-00, to lugnet.robotics)
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