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On Thu, 6 Jan 2000, Ben Jackson wrote:
> 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.
For fun, with a second sensor you can make a gouvenor, which takes it
speed from the track, and with a third motor you can change the gouvenor
setting :-). It works reasonably with the ligth sensor as well. Then it is
analog. But I found the curve very S shaped; i.e. little on the slow end.
Simply pointing the light sensor down (and geting a regular signal from
the beams in the track) works too, though for me the train goes funny when
it hits a switch in the track.
> 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...
Dw
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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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