Subject:
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Re: Motor speed
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 22 Nov 2002 21:07:12 GMT
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Original-From:
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Steve Baker <SJBAKER1@AIRMAIL.spamcakeNET>
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Viewed:
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889 times
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Brass Tilde wrote:
> > > the two motors appear to operate at slightly different speeds.
> > > Is this something that is usual?
> >
> > Yes.
>
> I figgered that was the case. <sigh>
Even if it wasn't the case, robots don't drive straight because of
small differences in how you build one side of the robot compared
to the other (eg the collars might be squeezed more tightly onto a
beam on one motor than on the other)...also you should consider
small differences in friction, unevenness in the floor...all
sorts of other effects.
Bottom line is that you simply cannot expect your robot to go
straight without some serious control logic.
> At the moment, it doesn't interfere with anything, as I am just starting to
> build things and am just now building the roverbot and going through the
> various "challenges". I'll keep those in mind though, for when I understand
> everything you're talking about. <g/> I am a programmer by trade, so the
> physical relationships between the parts are more arcane and challenging for
> me than the programming aspects.
Yes - I'm a programmer too - and the physical stuff is definitely the
hard part!
> Is the power adjustment fine enough to compensate for this sort of thing?
> Setting one motor to 7 and the other to 8 or something?
Not statically. You have to continuously monitor the number of revs
the drive shaft have gone through and 'float' the motor that's getting
ahead so that the other motor can catch up.
Rotation sensors are a very useful addition to your Lego collection.
---------------------------- Steve Baker -------------------------
HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sf.net http://tuxaqfh.sf.net
http://tuxkart.sf.net http://prettypoly.sf.net
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Message is in Reply To:
 | | Re: Motor speed
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| (...) I figgered that was the case. <sigh> (...) At the moment, it doesn't interfere with anything, as I am just starting to build things and am just now building the roverbot and going through the various "challenges". I'll keep those in mind (...) (22 years ago, 22-Nov-02, to lugnet.robotics)
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