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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Sun, 9 Jun 2002 19:30:38 GMT
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Original-From:
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Jonathan Spitz <jspiar@yahoo%Spamcake%.com.ar>
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Viewed:
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642 times
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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 linking RCX's. 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.
Jonathan.
----- Original Message -----
From: "Steve Baker" <sjbaker1@airmail.net>
To: "Mike Payson" <mpayson@dawgdayz.com>
Cc: "John Barnes" <barnes@sensors.com>; <lego-robotics@crynwr.com>
Sent: Thursday, June 06, 2002 8:34 PM
Subject: Re: Even better, RIS 1.5, $99.99
>
> > This brings up another question I have. Since I will now have two RCX's • can
> > someone give me a short summary of how to use them? Can both be used • from the
> > Mindstorms software, or is something better required (since I've only • had 2.0
> > a week, I haven't gotten frustrated enough with the Lego software to • abandon
> > it yet)?
>
> You can program each RCX independantly. You need to turn one off or put it
> out the way of the IR tower while you are downloading the program to the • other
> of course!)
>
> That much is pretty obvious - but where the fun comes is when you get the
> two RCX's to talk to each other via IR. I don't use the Lego programming
> environment - I'm an NQC fan - but I'm pretty sure it works the same way.
>
> There is a command to send (and another to receive) a single byte message
> via the IR link. So, with one command, you can send any number in the
> range 0..255 (actually, zero is to be avoided for various reasons) to
> whichever other RCX's (or Scouts) that are within IR range and pointing
> in the right direction.
>
> EXAMPLE:
> ~~~~~~~~
>
> So, you could have a robot that needs more than three motors (for example)
> and you could use a pair of RCX's - one that does all the 'thinking' and
> one who is the 'slave' who's only job in life is to drive the other three
> motors. You could send a single byte message from the 'thinking' RCX to • the
> 'slave':
>
> Message 1 -- Turn off motor A
> Message 2 -- Turn on/forwards motor A
> Message 3 -- Turn on/reverse motor A
>
> Message 4 -- Turn off motor B
> Message 5 -- Turn on/forwards motor B
> Message 6 -- Turn on/reverse motor B
>
> Message 7 -- Turn off motor C
> Message 8 -- Turn on/forwards motor C
> Message 9 -- Turn on/reverse motor C
>
> ...now, the 'thinker' can just pretend that it has six motors - sending
> IR messages to the 'slave' to turn them on and off.
>
> You can actually get much more fancy than this - having both robots do
> some heavy thinking and having them pass back and forth messages about
> their sensor readings.
>
> The only thing you need to be aware of is that if they both happen to
> send IR messages at the same time, things will get messed up.
>
> However, there are ways around that. I once had an RCX controlling *FOUR*
> Scout's - telling them how to drive their motors *and* when to make sounds
> *and* reading back their sensors. With that setup, I could drive 11 • motors
> and read back 11 sensors all in one gigantic machine.
>
> Now if only I could find a *use* for all of that!
>
> ----------------------------- Steve Baker -------------------------------
> Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
> URLs : http://www.sjbaker.org
> http://plib.sf.net http://tuxaqfh.sf.net http://tuxkart.sf.net
> http://prettypoly.sf.net http://freeglut.sf.net
> http://toobular.sf.net http://lodestone.sf.net
>
>
>
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Message has 1 Reply:
 | | Re: Even better, RIS 1.5, $99.99
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| (...) 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 (...) (22 years ago, 8-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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| (...) You can program each RCX independantly. You need to turn one off or put it out the way of the IR tower while you are downloading the program to the other of course!) That much is pretty obvious - but where the fun comes is when you get the two (...) (22 years ago, 6-Jun-02, to lugnet.robotics)
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