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 20:36:55 GMT
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Original-From:
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Bruce Boyes <BBOYES@SYSTRONIX.COMnospam>
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Viewed:
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762 times
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At 11:01 5/2/2001 -0400, Simon_Jensen-Fellows@avid.com wrote:
>
>
> 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??
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 (http://jcx.systronix.com) control system and
multiple RF modules. JCX has very good timer synchronization, though, and
its assumed that our robots will be collaborating. A hostile robot could
interfere.
Or if you can control the data format, can you filter out certain packets?
Add a preamble and checksum or CRC to your packets and ignore the data if
it isn't what you want.
How about a modulated signal for your IR obstacle detector, then
electrically filter out the noise and just pass your signal to your detector?
Bruce
------- WWW.SYSTRONIX.COM ----------
Real embedded Java and much more
High speed 8051 systems
+1-801-534-1017 Salt Lake City, USA
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Message is in Reply To:
 | | Re: Ir and proximity detection
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| Hi everyone, (...) 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 (...) (23 years ago, 2-May-01, to lugnet.robotics)
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