Subject:
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Re: Faster Firmware/Motor Control
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 17 Jul 2012 20:28:58 GMT
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Viewed:
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25387 times
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In lugnet.robotics.rcx, Iain Hendry wrote:
> Hi all,
>
> One of the common ways I like to control the speed of a gearmotor (in NQC) is by
> introducing a loop, for example, like this:
>
> while(true)
> {
> OnFwd(motor);
> Wait(a);
> Off(motor);
> Wait(b);
> }
>
> I often do this as a motor approaches a setpoint (say an offset from a target
> position as measured by a rotation sensor) or the like. Variable a and b could
> be defined somewhere else but usually are around 1/100 or 2/100 of a second.
> Any more than that and the motion gets jittery. I sometimes swap out Off for
> Float, depending on the application (unloaded the motors tend to glide right
> through the Float, however).
>
> I seem to remember hearing someone (Dick Swan?) built some Firmware a while back
> that ran much faster and allowed for 1/1000 second (millisecond) intervals for
> the Wait command, instead of 1/100 (decisecond). Any truth to that?
I have it and use it exclusively. i'll mail you a copy when i get your e-mail
sddess
Take care,
Dave K
>
> Obviously if I could cut down the time delay, the sawtooth of "On" to "Off" gets
> a lot crisper and the whole thing would work a lot better.
>
> Thanks in advance,
>
> -Iain
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Message has 1 Reply:
 | | Re: Faster Firmware/Motor Control
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| (...) Hi Dave, Thanks - I tried to send you a note, but your email bounced... I found this site: (URL) downloading the 100x firmware, I can tell that it is a different firmware (different clock, tone on button press is different, etc.) - however, it (...) (12 years ago, 18-Jul-12, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Faster Firmware/Motor Control
|
| Hi all, One of the common ways I like to control the speed of a gearmotor (in NQC) is by introducing a loop, for example, like this: while(true) { OnFwd(motor); Wait(a); Off(motor); Wait(b); } I often do this as a motor approaches a setpoint (say an (...) (12 years ago, 17-Jul-12, to lugnet.robotics.rcx)
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