Subject:
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Re: LEGO MindStroms 2.0: Alternative transmission techniques
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 19 Oct 2002 23:26:15 GMT
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Original-From:
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Steve Baker <sjbaker1@AVOIDSPAMairmail.net>
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Viewed:
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646 times
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Andreas Nauerz wrote:
> The roboter should be able to drive through a whole building by itself.
> During his drive he detects obstacles, walls etc.
> Everything he detects he sents back to a computer.
>
> The computer is the brain of this application.
> He holds the program (the logic) of the whole application.
> He gives the comand to the robot where to drive and accepts the feedback
> from the robot.
> Depending on what the robot sends he sketches a plan of the building.
>
> So this roboter is controlled by a PC and acts as a little architect ;-)
> We want to realize this via programming the robot with Java, e.g. a Java RCX
> API.
>
> First of all... is this whole project possible ?
Well, there are MANY difficult problems here.
1) Communications. The RCX uses IR - which is pretty much line-of-sight
only - so as soon as your robot drives under a table or around a
corner, it'll have to navigate by itself, record all the data it
collects and autonomously return to the PC to return results.
Hence, you either need a third-party radio link - or you have to
expect it to manage entirely by itself for long periods.
2) Navigation. The problem of knowing where the robot is. There have
been many long discussions on this topic on this mailing list - and
the bottom line is that NOBODY has a good solution.
You can navigate by 'odometry' - measuring how much your wheels have
turned - but that's hopelessly inaccurate over even a few tens of
seconds.
3) JAVA. The Java implementation for RCX runs all the software on the
PC and just sends commands to the RCX to turn on motors, read
sensors, etc. As has been pointed out, your RCX will be out of
communication with the PC pretty much all of the time - so this
isn't going to work. This would have to be done in NQC or (more
likely) BrickOS/GCC.
This is an EXTREMELY difficult problem.
I don't think it's possible at all using an all-Lego solution.
I think it's a major challenge even with a free choice of technologies.
---------------------------- Steve Baker -------------------------
HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sf.net http://tuxaqfh.sf.net
http://tuxkart.sf.net http://prettypoly.sf.net
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Message has 1 Reply:
Message is in Reply To:
 | | LEGO MindStroms 2.0: Alternative transmission techniques
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| Hi, we want to build a Roboter with the following characteristics and under the following conditions: The roboter should be able to drive through a whole building by itself. During his drive he detects obstacles, walls etc. Everything he detects he (...) (22 years ago, 19-Oct-02, to lugnet.robotics)
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