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Hi Ben,
I think I missed something here. What is "PWM mode"? What language are you
programing in? And what is the "internals page"? Thanks so much for pursueing
this! I did pick up the Unofficial Guideo to LEGO MS Robots by Jon Knudsen but
only skimmed thru it do you have any pointers within that text?
SteveB
In lugnet.robotics.rcx, Ben Jackson writes:
> In lugnet.robotics.rcx, Steven Barile writes:
> > My goal is to pulse LEGO train motors for better speed control
>
> I was just experimenting with this a few days ago. An RCX using PWM does a • far
> better job of driving the LEGO train motors than the simple variable voltage
> from the LEGO train control. You can make a train creep around just above
> stall speed consistently, even through curves which would stop the train with
> the train controller at the lowest setting.
>
> If I remember the Internals page correctly, the PWM tables are stored in the
> FW, so they could be altered to a profile more appropriate for trains if the
> current settings are unsatisfactory...
>
> --Ben
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Message has 1 Reply:
 | | Re: RCX onboard timer and motor pulsing
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| (...) PWM stands for "pulse width modulation". The LEGO speed control changes voltage as you turn the knob. An RCX turns the motor on and off really fast but always supplies full voltage. So half speed is a 50% duty cycle of full power, rather than (...) (25 years ago, 6-Jan-00, to lugnet.robotics.rcx, lugnet.trains)
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Message is in Reply To:
| | Re: RCX onboard timer and motor pulsing
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| (...) I was just experimenting with this a few days ago. An RCX using PWM does a far better job of driving the LEGO train motors than the simple variable voltage from the LEGO train control. You can make a train creep around just above stall speed (...) (25 years ago, 6-Jan-00, to lugnet.robotics.rcx, lugnet.trains)
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