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 06:12:33 GMT
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Viewed:
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670 times
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In article <000001bf2fea$d0c9c4c0$0500000a@pro150>, "Ralph Hempel"
<rhempel@bmts.com> wrote:
> > 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?
>
> 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.
You don't really need to shade the line. Start with something like a
3/4" wide black line over a white background. If the light sensor is over
the edge between the line and the background it should read a value midway
between "black" and "white". If the robot wanders too far to one side it
will see all black, too far to the other it will see white. I've had
pretty good results with this sort of line following - the only catch is
that the line needs to be wide enough trigger a black reading with enough
time for the robot to then react and change course.
Dave Baum
--
reply to: dbaum at enteract dot com
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Message has 1 Reply:
 | | Re: Line Followers
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| (...) You beat me to the punch, Dave. I was just about to say that, with the light sensor correctly positioned, if it is just on the "edge" of a thick black line on a white background, it sees gray (some black and some white). Given the width of (...) (25 years ago, 16-Nov-99, to lugnet.robotics)
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Message is in Reply To:
| | 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)
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