Subject:
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Re: Ir and proximity detection
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 2 May 2001 15:01:20 GMT
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Original-From:
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Simon_Jensen-Fellows@avid.+spamless+com
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Viewed:
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456 times
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Hi everyone,
> We in Toronto are going to be having another robotics competition soon. Our
> new rules allow for multiple Rcx robots. This means that they will have to send
> IR signals back and forth to communicate. Unfortunately, I was really wanting
> to do proximity detection with my sinlge rcx robot. Since the other robot(s)
> will be blasting IR all over the place to communicate, I'm assuming my robot
> would be seeing reflections of their IR as well as its own signals. Sounds like
> a big mess:( Is there any way to program the light sensor to respond only to a
> certain frequency of IR? In the mess of IR bouncing all over the place, could
> I filter out my signal somehow? Or will I have to resort to bumpers and just
> stupidly bumping into walls like before??
No you can't tune the frequency of the IR. Although with two RCXs you could use
the
comms IR to look for reflected packets with specific content. However, do you
want
o avoid or attack other robots ? If it's avoid, then you don't have a problem,
you'd
want to avoid stray IR just as much as reflected.
If it's attack, then with a well thought out algorithm, you could avoid
reflections
and attack direct signals. There are a couple of ways of doing this:
thresholding might
work: below a certain value it's a reflection, above another is another robot.
Mechanically
or electrically blocking and unblocking the IR would let you know if it is your
IR or not.
This probably doesn't even have to be perfect, 25% accuracy in spotting another
robot
for attack is better than 0%.
-Simon
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Message has 1 Reply:
 | | Re: Ir and proximity detection
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| (...) to send (...) wanting (...) Sounds like (...) to a (...) could (...) Is the Lego timer good enough to use time division multiplexing, assuming the other robots are yours and you can synchronize them. We're hoping to use this with our jcx (...) (23 years ago, 2-May-01, to lugnet.robotics)
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