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 13:37:55 GMT
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Viewed:
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1005 times
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lego-robotics@crynwr.com (Mark Crosbie) writes:
>
> 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!
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 markings, but is also less
accurate.
Solution 3 works nicely in theory, but in practice it still
may drift to one side (mine did).
If markings are allowed 2 is best.
Jürgen
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
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Message is in Reply To:
 | | Re: Help with my robot
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| (...) 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. (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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