Subject:
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Re: robosoccer ball problem...
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Newsgroups:
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lugnet.robotics.edu
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Date:
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Tue, 29 May 2007 13:31:33 GMT
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Viewed:
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6307 times
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In lugnet.robotics.edu, Elizabeth Mabrey wrote:
> I don't want to frustrate them with the
> fluctuating IR ball.
It's not ideal for stock LEGO sensors I think, but it might be good to point out
to them that the reason it blinks is to make things *easier*. With a source
pulsing near a known frequency, ambient conditions are much easier to cancel
out.
> I am planning to find a constant "lighted"
> ball for them instead, but no luck.
I've not seen them either. But I would think this is something a friend could
make with a battery pack and a bunch of near-IR LEDs. Perhaps a first step (for
them to practice on) can be a "target RCX" driving 3 light sensors (or an NXT
driving 4). You might even be able to stack two RCX light sensor on each RCX
port, to get 6 near-IR (although dimmer) light sources, and arrange them in a
circle facing out.
> the official IR soccer ball has a very unreliable
> IR emission. There are times my IR sensor just
> simply did not get any feedback even when it is
> right next to it.
It might be that the pulses of the IR ball were out-of-sync with the reads of
the light sensors. Have you tried looking at the IR ball through a stock video
camera? These usually have very good IR sensitivity, so you can "see" the IR in
the playback. Spybots are rather impressively flashy on video.
--
Brian Davis
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Message is in Reply To:
 | | RE: robosoccer ball problem...
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| Hi all, I am trying to get some middle school kids playing a bit with the robosoccer idea. I don't want to frustrate them with the fluctuating IR ball. So, I am planning to find a constant "lighted" ball for them instead, but no luck. Wonder if (...) (17 years ago, 28-May-07, to lugnet.robotics.edu)
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