Subject:
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Re: Tachocount
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 12 Nov 1998 16:59:05 GMT
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Original-From:
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Laurentino Martins <lmartins@AVOIDSPAMmarktest.pt>
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Viewed:
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5024 times
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Do you think a tachometer needs to distinguish direction? Why?
Going forward or not, a vehicle _moves_ from one place to the other, so the space moved must always be added, never subtracted.
How could you otherwise figure _how_much_distance_ you traveled if sometimes it added and sometimes subtracted???
Have you ever seen a car were when the distance counter starts counting backwards when it reverses direction?
Laurentino Martins
--//--
At 16:38 12-11-1998 Thursday , you wrote:
> "Eric Brok" <brok@fcjsvc.hvu.nl> writes:
>
> > I fiddled a liitle with it, but it doesn't seem too useful, first of
> > all because the internal motors are only practical to use for wheels
>
> I'm sure the motors may be used for other things as well, albeit not as
> easily as separate motors.
>
> > and second because the tachocounter doensn't distinguish direction.
>
> But in a program you will always know which way the motors drive, right?
> So one can possibly maintain a second variable for each motor that is
> updated every time the motor changes direction. That way, it may be
> possible to keep track of the distance travelled.
>
> > So you can only use it as a feedback input while the motor is driven
> > by the program, so you know the direction. I used such a feedback
> > loop to make my Crusher walk a little straighter
>
> This sounds useful enough for me.
>
> The speed and torque of the motors also appeal to me. The new 9V geared
> motor almost always needs to be geared down anyway, so it's a good thing
> that the Cybermaster motors have a somewhat slower pace. (I still
> haven't used them that much, though, but that's mostly due to the fact
> that I don't have a computer at home.)
>
> Fredrik
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Message has 2 Replies:
 | | Re: Tachocount
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| (...) I think we need to think of other applications than cars as well. The tachometer can be useful in a lot of other mechanisms. Suppose we have a 2D plotter set up, and use one motor for the x coordinate and one for the y. That way, tachometers (...) (28 years ago, 12-Nov-98, to lugnet.robotics)
| | | Re: Tachocount
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| Good point of view, but I think that the intention of LEGO when created CyberMaster was to make vehicles. From that point of view it is a great bonus to have some tacho counters, since a toy car don't need them very much (but maybe Crusher needs (...) (28 years ago, 12-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Tachocount
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| According to the Technical Reference, Tachocount counts the number of revolutions of the motor shafts (of the two built-in Cybermaster motors ONLY). I fiddled a liitle with it, but it doesn't seem too useful, first of all because the internal motors (...) (28 years ago, 11-Nov-98, to lugnet.robotics)
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