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On 7/14/05, Elizabeth Mabrey <emabrey@storming-robots.com> wrote:
> Without any precious hardware verification, this is what I did:
> - symptom: motor C was not able to make turn as well as motor A can
> - troubleshooting steps:
> a) to ensure even load on both motor ports, I removed all other
> attachments, and left the robot to a simple tankbot with a single light
> sensor to follow slight curves in order to make it easier to visualize the
> difference.
> b) at program level, both are set to be the same power level, of course.
> c) interchange motors between port A and C, same symptom, so the problem
> is not the motor itself
> d) change fresh batteries, drain the firmware, redownload the firmware,
> same symptom
Okay - did you try a simple program going in a straight line, and
check how much it veered after a few meters?
Unfortunately - it does not sound an entirely unlikely problem - if
there are variations between the h-bridges (general manufacturing
variations etc) - then you may get this. Neithor motors, nor outputs
can be relied on for very accurate output - my answer (and a few
others) to this - to eliminate veer is to use an adder subtractor
drive (these are also used for crane systems as well).
Have a look at this:
http://orionrobots.co.uk/tiki-index.php?page=Adder+Subtractor+Drive
Cheers,
Orion
--
http://orionrobots.co.uk - Build Robots
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