Subject:
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Re: Line Followers
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 16 Nov 1999 03:58:09 GMT
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Viewed:
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530 times
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With just one light sensor, the problem is that you have to guess which
direction you just fell off the line. i.e., your sensor suddently goes
from dark to light. Is the dark to your left? Your right? There's no real
way of telling, is there?
If you guess well, you can follow the line well. If you don't guess well,
you are in trouble. Frankly, I have no strategies for guessing well.
However, "go x left, 2x right, 3x left, 4x right" is not unreasonable, and
I believe some variation on that (perhaps x left, 2x right, 4x left, 8x
right, but I'm not sure) is mathematically provable to be the best
solution for this type of problem. Note: these are not actually go left,
but spin left, spint right, etc. with the assumption that you have stopped
when you "lost" the line.
With two light sensors, this suddenly becomes much easier, and with
three, you can build a great light sensor. However, forks still aren't
dealt with well- you need depth as well as breadth to be able to analyze
those robustly and on the fly (in my opinion). Anyone have any thoughts
on that one?
-Luis
On Tue, 16 Nov 1999, David Morgan wrote:
> Date: Tue, 16 Nov 1999 00:08:59 GMT
> From: David Morgan <lego-robotics@crynwr.com>
> To: lugnet.robotics@lugnet.com
> Subject: Line Followers
>
> Hi,
>
> Could someone please give me a little bit of advice on building a line
> follower with the standard lego light sensor? I will be doing the
> programming for it with LegOS.
>
> Can you achieve decent performance with just one light sensor?
>
> Thanks!!
> Dave Morgan
>
>
#######################################################################
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Message has 2 Replies:
 | | RE: Line Followers
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| (...) One way around it is a specially graded line. It's black on one side and light on the other, sort of a dark grey in the middle. Try to keep the sensor in the dark grey area. (...) Yes. Now that I have solved the maze problem on paper with the (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
| | | Re: Line Followers
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| Hello, After various discussions here about maze walkers and synchro 'bots, I decided to try my hand at YASB (yet another synchro 'bot). Furthermore, I decided that instead inverting the problem as Ralph did, that I would turn it inside out by (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | Line Followers
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| Hi, Could someone please give me a little bit of advice on building a line follower with the standard lego light sensor? I will be doing the programming for it with LegOS. Can you achieve decent performance with just one light sensor? Thanks!! Dave (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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