Subject:
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Re: problem with control speed using NQC
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Fri, 23 Jul 1999 20:18:44 GMT
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Viewed:
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2478 times
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The Mindstorms RCX Code software does the exact same thing as the code you
listed, the only caveat is I think RCX Code uses power settings from 1 to
8 while NQC uses 0 to 7. Both result in the same bytecodes for the RCX to
interpret.
// turn A on lowest power, C on fastest
Fwd(OUT_A, 0);
Fwd(OUT_C, 7);
Dave
In article <FF92qI.Cy4@lugnet.com>, "Ben Fleskes" <benfleskes@msn.com> wrote:
> But how does the original mindstorms software do it. With the Mindstorms
> software you can set the speed of each motor and it is obviously different.
>
> I must be missing something. I did a search on lugnet and found some NQC code
> to drive the motors with 255 different speed settings, but havn't spent the
> time to implement it yet. Has anyone else tried this. The program is pretty
> long.
>
> In lugnet.robotics.rcx.nqc, Dave Baum writes:
> > The RCX uses pulse-width modulation to control power to the motor. The
> > pulses are between 1ms and 8ms of power during an 8ms interval. In
> > theory, this would result in different power being provided to the motor.
> >
> > The problem is that the motor has an internal flywheel, and even at 1/8
> > duty cycle (1ms per 8ms), the motor can keep the flywheel going at full
> > speed (without a heavy load).
> >
> > You'll notice more of a difference in speed if the motor is under heavy
> > load, but even so the PWM scheme isn't great.
> >
> > Dave
> >
> > In article <FF7J8H.Anz@lugnet.com>, "Ben Fleskes" <benfleskes@msn.com> wrote:
> >
> > > Okay, need some more help.
> > >
> > > I have the following code running. My expectation is that the speed of the
> > > motor would increase but the integer value in the 'Fwd' command doesn't seem
> > > to make any difference. The motor always runs at full speed.
> > >
> > >
> > > Fwd(OUT_A+OUT_C,1);
> > > Sleep(50);
> > > Fwd(OUT_A+OUT_C,3);
> > > Sleep(50);
> > > Fwd(OUT_A+OUT_C,5);
> > > Sleep(50);
> > > Fwd(OUT_A+OUT_C,7);
> > > Sleep(50);
> > >
> > >
> > > What am I missing?
> > >
> > > Thanks for your help.
> > >
> > > Ben
> >
> > --
> > reply to: dbaum at enteract dot com
--
reply to: dbaum at enteract dot com
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Message is in Reply To:
 | | Re: problem with control speed using NQC
|
| But how does the original mindstorms software do it. With the Mindstorms software you can set the speed of each motor and it is obviously different. I must be missing something. I did a search on lugnet and found some NQC code to drive the motors (...) (25 years ago, 22-Jul-99, to lugnet.robotics.rcx.nqc)
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