Subject:
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Re: Varying the output voltage?
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sun, 15 Jun 2003 01:14:22 GMT
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Viewed:
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2891 times
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In lugnet.robotics.rcx.legos, Juergen Stuber wrote:
> "Bluey" <Wolf_and_eagle@spamblock.yahoo.com> writes:
> >
> > The overall answer is, the RCX is set up only to have
> > three voltage levels: +9, 0, and -9.
> > The basic options there are On, Off, and Reverse.
>
> Actually there are four, sort of, as for 0 there are float
> (contacts separated, infinite resistance) and brake
> (contacts shorted, zero resistance).
>
> The standard firmware switches rapidly between on and float
> (each cycle takes 8ms), which reduces power but not speed,
> unless you have a load.
>
> If you switch between on and brake you can regulate speed,
> but this might strain the motors more.
>
> > Now by electronically varying the Pulse Width you get 8/7
> > (not sure) levels of power in each direction instead of
> > the original 3, that is all you get.
>
> The number of levels depends on the software, the standard
> ROM supports 8 (0-7) which correspond to 1-8 on out of 8ms.
> I think brickOS has many more levels.
>
>
> Jürgen
you're right, I forgot float. Thanks for clearing the rest up for me :-)
Doesn't the motor itself have a "load" when it works with no actual load? "which
reduces power but not speed"
Timothy
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Message has 1 Reply:
 | | Re: Varying the output voltage?
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| (...) The power motors that come with the RIS are very efficient, so the load is very light and speed changes very little. Then of course it depend on your robot, if you use caterpillar tracks you will generally have more load than with wheels. An (...) (21 years ago, 15-Jun-03, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: Varying the output voltage?
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| (...) Actually there are four, sort of, as for 0 there are float (contacts separated, infinite resistance) and brake (contacts shorted, zero resistance). The standard firmware switches rapidly between on and float (each cycle takes 8ms), which (...) (21 years ago, 14-Jun-03, to lugnet.robotics.rcx.legos)
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