Subject:
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Detecting a laser-pointer dot with LEGO light sensor (was "Autonomous robots")
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 5 Aug 2000 04:34:35 GMT
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Viewed:
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823 times
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Mario Ferrari wrote: ( http://news.lugnet.com/robotics/?n=11948 )
> 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".
And Jürgen Stuber wrote in reply: ( http://news.lugnet.com/robotics/?n=11957 )
> 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.
On the detecting a laser pointer thing -- I solved it last year. Check out
LaserTarget on my Mindstorms Inventions page.
http://www.legomindstorms.com/members/gallery.asp?userid=36101#LaserTarget
Cheers
JP
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