Subject:
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Re: help line follower program-RIS2
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 24 Apr 2006 17:57:54 GMT
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Viewed:
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2167 times
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In lugnet.robotics, Robert C. Peterson wrote:
> I have formed a LEGO group here in Colombia using RIS 2 and the standard RIS2
> software.
>
> Our challenge is for each team to make a line follower that will follow a white
> line on a black field. I could use some sample programs to help the students. We
> have not had much luck in getting the programs to follow a line that goes in
> multiple directions (not a circle).
>
> I am tempted to give each team the same program to start with and soem might
> have to program differently for speed and accuracy of their design.
Robert,
There are many things that can affect how well a line following robot can work.
Assuming you're using a single light sensor, and a differential drive robot
(tank drive), the simplest approach is to use "edge-following". This means if
the sensor sees "light" one motor stops, while the other goes forward. When the
sensor sees "dark" the other motor stops, while the first goes forward.
This approach doesn't work well, if the robot is too fast. And, the "threshold"
between light and dark will vary with different light sensors.
However, it's a pretty simple program, and will work on a simple (slow) robot.
A slow robot would be one that uses almost any wheel, geared down.
Need more?
Steve
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Message has 1 Reply:
 | | Re: help line follower program-RIS2
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| [Dang, Steve, you beat me to it. Are you *ever* off-line ;) ?] (...) The other constraint can be how sharply the line turns. If you have a bunch of 120° turns in the line, it will be more difficult to keep the robot's light sensor over the line edge (...) (18 years ago, 24-Apr-06, to lugnet.robotics)
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Message is in Reply To:
| | help line follower program-RIS2
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| I have formed a LEGO group here in Colombia using RIS 2 and the standard RIS2 software. Our challenge is for each team to make a line follower that will follow a white line on a black field. I could use some sample programs to help the students. We (...) (18 years ago, 24-Apr-06, to lugnet.robotics)
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