Subject:
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Re: Another update for WIRRL
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Oct 2002 04:24:22 GMT
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Original-From:
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Rob Limbaugh <[rlimbaugh@greenfieldgroup]spamless[.com]>
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Viewed:
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984 times
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I should have removed the word "messenger". After all, doing something by
"proxy" would imply a messenger-type role.
What I meant was, for DeviceA to send a message to DeviceB, they would have
to use some sort of proxy or router between them (the tower) because they
can't speak to one another directly. I updated the WIRRL page with the
links below to (hopefully) explain this better.
Two devices using two frequencies:
http://www.abs-robotics.com/projects/images/2dev-2chan-small.jpg
Three (or more) devices using two frequencies:
http://www.abs-robotics.com/projects/images/3dev-2chan-small.jpg
Communication using one freq with half-duplex transceivers:
http://www.abs-robotics.com/projects/images/multi-1chan-small.jpg
If you look inside the RCX or a Serial Tower, you'll find there are no
barriers. When mounted properly, barriers aren't needed because of the
properties of the components.
From what I can tell, the objective is to keep WIRRL from reacting to
reflected IR it sees from itself (or any other source) when sending IR to an
RCX, tower, or whatever.
----- Original Message -----
From: "Bluey" <Wolf_and_eagle@spamblock.yahoo.com>
To: <lego-robotics@crynwr.com>
Sent: Tuesday, October 22, 2002 5:43 PM
Subject: Re: Another update for WIRRL
> What's a "proxy messenger"?
>
> Couldn't the reflection problem be solved by placing a barrier in between
> the emitter and receiver?
>
> Timothy
>
>
> In lugnet.robotics, "Rob Limbaugh" <RLimbaugh@greenfieldgroup.com> writes:
> > Just in case people are a bit confused by the schematic, the circuit =
> > would be needed for each device that will participate in an RF bridge.
> >
> > I abandoned the idea of using two different frequencies because:
> >
> > 1) As soon as you attempt communication between more than two devices, =
> > one device would have to be a proxy messenger.
> >
> > 2) Using two different RF frequencies doesn't solve the =
> > IR-reflection-feedback problem that would exist.
> >
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Message is in Reply To:
 | | Re: Another update for WIRRL
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| What's a "proxy messenger"? Couldn't the reflection problem be solved by placing a barrier in between the emitter and receiver? Timothy (...) (22 years ago, 22-Oct-02, to lugnet.robotics)
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