Subject:
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Re: Even better, RIS 1.5, $99.99
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 8 Jun 2002 22:56:22 GMT
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Original-From:
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Steve Baker <SJBAKER1@saynotospamAIRMAIL.NET>
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Reply-To:
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sjbaker1@!stopspam!airmail.net
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Viewed:
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769 times
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Jonathan Spitz wrote:
> There's one way for solving the problem with multiple IR communications at
> the same time. The method used for old computer networks is called a "token"
> wich is passed from PC to PC giving each one a chance to "speak". This could
> also be used for linking RCX's.
That's actually what my 1xRCX + 4xScout system uses.
Another way to think of it is "Don't talk until the person before you
has finished speaking". If each machine has a number, you can send that
number embedded in the message somewhere.
The only problem with a token ring scheme is that if an IR message get's
"lost" somehow, the token is lost and nobody can talk anymore.
Another way is to have a 'master' computer (the RCX in this case) and
have the others be 'slaves'. Then the master can send a COMMAND to
tell a specific slave to reply with (for example) the value of one
of it's sensors.
Now, the master can talk at any time - unless it just asked for some information,
but the slaves are not allowed to talk unless they've specifically been asked
for a reply.
The big snag with all this is that the turn-around time for the IR signalling
is very slow - so any of these schemes can result in a second or two of delay
between a sensor on one of the slave machines being activated and that fact
finally reaching the master computer.
> You must also check that the RCX have IR
> contact by sending a reply to the sender or the token would probably get
> lost. If any of you get to work on this subject I would be pleased to see
> some reults.
I should probably write up my RCX/Scout work and put it on my web site
somewhere.
----------------------------- Steve Baker -------------------------------
Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
URLs : http://www.sjbaker.org
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Message has 1 Reply:
 | | Re: Even better, RIS 1.5, $99.99
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| I have thought about those methods as well, the only problem is when you don't work with the RCX's for just one robot. When you want to try a little bit with AI and interactions between different robots you can't have a master that requests, unless (...) (22 years ago, 9-Jun-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: Even better, RIS 1.5, $99.99
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| There's one way for solving the problem with multiple IR communications at the same time. The method used for old computer networks is called a "token" wich is passed from PC to PC giving each one a chance to "speak". This could also be used for (...) (22 years ago, 9-Jun-02, to lugnet.robotics)
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