Subject:
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Re: LEGO MindStorms 2.0: Alternative transmission techniques
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Mon, 4 Nov 2002 13:17:47 GMT
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Viewed:
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2925 times
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Hi Andreas
Your project requires you face some very tough problems. I'd say that you
cannot reach your goal, unless you add a lot of non-Lego hardware stuff
to your robot and your building.
IR communication is not appropriate, as it requires the robot and the
tower are always in visual contact each other. Thus you should look for
some custom radio interface.
However, the biggest problem is navigation. There's no easy and reliable
solution that allows your robot to know precisely where it is inside an
area as wide as a building. It could use some measurement system (like
monitoring the distance covered by the wheels) to have a rough idea of
its position, but unfortunately this technique acumulates errors in a
pretty fast manner and leads to wrong assumptions after some movements of
just a few meters. Other tecniques require external reference points,
which the robot can use to deduce its position: this are either
artificial landmarks like lines or spots on the floor, or some kind of
radio or light beams. All of these require complex preparation even to
make the robot effectively navigate a single room, the work to prepare a
whole building would be huge.
You have choose quite a complex matter for your project :-) It's been
discussed many times on the lugnet.robotics newsgroups. If you want to
know more I suggest you search lugnet.robotics for "navigation", you'll
find some interesting (and long) discussions.
HTH
Ciao
Mario
"Andreas Nauerz" <a0355137@addcom.de> wrote:
> 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 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 ?
>
> Our problem (!):
> What happens if the robot leave the room ?
> How can we still send data from the PC to the Robot (for control of
> the movement) ?
> How can we still receive data from the robot to the PC (for feedback
> about obstacles and walls) ?
>
> We do not want to use wires of course.
>
> Any ideas ?
> I guess IR is inappropriate in this case, or ?
> Are there other wireless solutions ?
>
> Thanks a lot for your support !
>
> Regards, Andreas
>
>
>
>
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