Subject:
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Re: "Servo" Driver for NQC
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 30 Jan 2002 13:03:21 GMT
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Viewed:
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2092 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message
news:3C56F4B7.FC698E2D@airmail.net...
> > Several years ago I built a
> > controller for an N scale train set where I used a pulse width
> > modulation technique (which is what you're describing) to drive the
> > engines around. This system works very well, but the frequency must be
> > fairly high. If you slow the frequency down considerably you get
> > exactly what you described - jerky on-off motion. I'm somewhat of the
> > opinion that the NQC doesn't allow you to toggle the power fast enough
> > to make the motion smooth.
> But it doesn't need to. The 'power' settings built into the RCX firmware
> are already using pulse-width modulation to adjust the amount of power
> the motor delivers.
Then why doesn't it work? :-/ At lower power settings, all it seems to do is
sit there and humm, not wanting to go. It really dosen't work that well in
high-load applications (or low-load applications, either, as it simply ends
up spinning up to full speed (which is what happens when you use Float! See?
:) ))
Iain
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Message is in Reply To:
 | | Re: "Servo" Driver for NQC
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| (...) But it doesn't need to. The 'power' settings built into the RCX firmware are already using pulse-width modulation to adjust the amount of power the motor delivers. ---...--- Steve Baker ---...--- Mail : <sjbaker1@airmail.net> WorkMail: (...) (25 years ago, 29-Jan-02, to lugnet.robotics)
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