Subject:
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Re: building a maze
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 12 Nov 1999 20:32:35 GMT
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Viewed:
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887 times
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That's a great idea. As it is, the light sensor 'arm' is in the forward
position during travel, so I could use it to track a line down the center of
the squares. I suppose I could put a colored dot on the line where the light
sensor ends up if the robot is in the center of the square. Some of this is
probably tough to visualize, I will get some pictures somewhere soon.
I would like to have the maze as 'clean' as possible, ideally with just the
walls. The less artificial support the better, but the RCX has limits.
However, I think the rules allow for putting additional marks on the floor of
the maze.
Richard
richard at mailstart dot com
"Robot building is fun."
In lugnet.robotics, lego-robotics@crynwr.com (Paul Speed) writes:
> Interesting,
>
> About your positioning problem... perhaps you can mark down
> the center of the "hallways" with a different color than is used for
> the walls. This way you can use standard line following methods to
> keep your 'bot centered within the passages. At intersections you
> could correct your position/counters by finding the intersecting
> line.
>
> Heck, now that I think about it, I may try to make a line
> follower with a bit of maze navigation built in.
>
> -Paul (pspeed@progeeks.com)
>
>
> Richard wrote:
> >
> > Your challenge inspired me to give it a try. I decided to make an
> > actual moving robot that would navigate the full 8x8 maze. I
> > constructed a section of the maze and went to work. I hope to have
> > pictures soon, but here is a little information.
> > <-SNIP>
> > The problem is the positioning errors. It is pretty important that
> > the robot get to the center of each square. After moving 7 or 8
> > squares, there is enough accumulated error to cause problems. I have
> > the treads geared way down to increase the rotation counts per unit
> > distance or rotation, but the touch sensor based counters just are
> > not good enough. Some real rotation sensors would probably improve
> > the accuracy by quite a bit.
> >
> > As it stands now the robot can navigate to the beacon in my small
> > mazes, anything larger and the robot would eventually get confused
> > and end up crossing a wall, which happens sometimes even in the
> > small mazes I use (usually 4x4). It does make the right choices
> > and proceeded methodically, and very slowly, towards the light
> > beacon.
> >
> > Wow, maybe that was a bit more than 'a little information'. I am
> > stuck without rotation sensors, any hints or suggestions?
> >
> > Richard
> > richard at mailstart dot com
> >
> > "Robot building is fun."
> >
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Message has 1 Reply:
 | | Re: building a maze
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| (...) I tried using different colors, but it is difficult to make it work because of the limited range values of the light sensor. I got plenty of false readings, and I would like to be able to sense what is to be sensed without stopping... It (...) (25 years ago, 13-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: building a maze
|
| Interesting, About your positioning problem... perhaps you can mark down the center of the "hallways" with a different color than is used for the walls. This way you can use standard line following methods to keep your 'bot centered within the (...) (25 years ago, 12-Nov-99, to lugnet.robotics)
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