Subject:
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Re: New Lego challenge !
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 15 Sep 1999 20:39:31 GMT
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Original-From:
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Paul Speed <pspeed@augustschell(AvoidSpam).com>
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Viewed:
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618 times
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Philippe Jadin wrote:
>
> Ralph Hempel wrote :
>
> > Given a maze DRAWN on a piece of paper, can we devise a "bot"
> > that is just a light sensor that finds grey square and avoids
> > the black lines that represent the walls?
>
> This is a great idea, and this could be usefull for at least two
> reasons:
>
> -If you don't have room to create a real maze
> -We don't have an easy way to make a real bot move in either precise x
> or y direction (because of friction, a bot cannot make severall precise
> 90 degree turns). We need a compass to do that.
Actually, a synchro-bot is pretty good at this. In case you
missed previous threads, this 'bot is one that the direction of all
of its wheels are synchronized. The robot can drive in any direction
but its orientation never changes.
With a little mechanical restriction it could be pretty good
at only making 90 degree angles. With a light sensor mounted
underneath in the center it could even find walls pretty well.
(Of course, it would have to have driven slightly through them
first.) There is another bonus since the sensor will be pretty
well shielded from ambient light by the robot itself.
One downside of this design is that it is impossible to
make with stock Mindstorms parts. The most compact designs all
use the turntable piece (mine is only one brick width wider than
two turntables.) and still aren't very compact.
However, because it is an autonomous unit instead of a
scanner device, it could conceivable handle any size maze. Sort
of a combination of the robot and scanner approach.
Interesting problem though... I may end up drawing a maze
on the floor soon. :)
-Paul (pspeed@progeeks.com, http://www.progeeks.com/)
>
> So, my proposition is to have TWO challenges :
> (you choose the one which suits best your skill / place available)
>
> 1. Design a real bot which can enter into a maze and find it's way (as
> described on my page)
> 2. Design a virtual robot made of a light sensor, as you said :
>
> > "Given a maze DRAWN on a piece of paper, can we devise a "bot"
> > that is just a light sensor that finds grey square and avoids
> > the black lines that represent the walls?"
>
> I'll update the challenge pages soon to include this. Any comments?
>
> Very good, and I'll be able to use my scanner mecanic to complete this:
> look at http://users.swing.be/philippe.jadin/mylego.htm
>
> We could eventually first "scan" the maze, and then try to complete it
> in much less time...
>
> In any case, there are plenty hours of fun in both challenges...
>
> And I'm waiting for your results !
>
> Philippe.
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Message has 1 Reply:
 | | Re: New Lego challenge !
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| On Wed, 15 Sep 1999, Paul Speed wrote: <snip> (...) <snip> (...) Depending on how you define "stock Mindstorms parts", you _can_ make a synchro-bot. You can use a differential instead of the turntable, hence you need one RIS for each wheel! This (...) (25 years ago, 16-Sep-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: New Lego challenge !
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| Ralph Hempel wrote : (...) This is a great idea, and this could be usefull for at least two reasons: -If you don't have room to create a real maze -We don't have an easy way to make a real bot move in either precise x or y direction (because of (...) (25 years ago, 15-Sep-99, to lugnet.robotics)
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