Subject:
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Re: Help with my robot
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 12 Dec 2000 06:12:44 GMT
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Original-From:
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Mark Crosbie <mcrosbie@happy.xkey.comNOMORESPAM>
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Viewed:
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1126 times
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In message <G5Fp8J.4s9@lugnet.com>, "Ahui Herrera" writes:
> The problme i am having is that the robot will not go straigt. it is not
> turning 180 degrees.
You will probably need a rotation sensor to ensure that the robot is
travelling in a straight line. No two LEGO motors will rotate at the
same speed, so you will always encounter drift when driving a robot.
I can think of three solutions:
1. Use rotation sensors to monitor the wheels and correct for differences
in speed.
2. Use a light sensor to follow marking on the floor and correct it
course.
3. Use an adder/subtractor drive. One motor drives the robot and another
provides a steering correction input. Thus as both wheels are driven
from the same motor, you get no drift!
For more on approach #3 see
http://carol.wins.uva.nl/~leo/lego/diff.html
http://www.phred.org/~alex/lego/
If you have no rotation sensors use approach #3.
You can check out my web site for some code and ideas:
http://www.mastincrosbie.com/mark/legoprogrjects.html
Mark.
> See my website for pics and the code I am using.
>
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Message has 2 Replies:
 | | Re: Help with my robot
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| (...) 4. Measure the deviation and correct it by a small turn every now and then. (this is what I did when I first got my RIS and wanted it to take a tour of my flat, total length about 15m with a few turns). This avoids use of rotation sensor or (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
| | | Re: Help with my robot
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| (...) Especially when they have to turn in opposite directions, as in the case of a standard differential drive robot (with one motor driving the left and the other the right side of the robot)! This is because a motor is always more efficient (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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Message is in Reply To:
| | Help with my robot
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| I got a problem. I have a simple two motor robot that I want to have a push button cause the following: 1 hit the push button 2 robot turns 180 deg and move forward 3. after 15 feet robot stops 4 repeat 1 - 3 The problme i am having is that the (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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