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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Thu, 22 Jul 1999 00:27:12 GMT
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Viewed:
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2115 times
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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
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Message has 1 Reply:
 | | Re: problem with control speed using NQC
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| 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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Message is in Reply To:
| | problem with control speed using NQC
|
| 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. (...) (25 years ago, 21-Jul-99, to lugnet.robotics.rcx.nqc)
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