Subject:
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Re: Lego trains and the RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 2 Dec 1999 20:49:42 GMT
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Original-From:
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Brian Connors <connorbd@yahoo.comSAYNOTOSPAM>
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Viewed:
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431 times
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--- "Avery, Amos E." <Amos.E.Avery@disney.com> wrote:
> Has anyone tried running their 9v train set off of
> the rcx? I did it over
> thanksgiving with limited success. At full power
> out of the rcx, the train
> moved only about 1/2 speed (rcx 1.0 plugged into the
> lego train's ac
> wallwart). I haven't measured yet, but I'm guessing
> that either the riostat
> that runs the train provides a few more volts output
> at full speed or the
> rcx limits the current to the output port. Does
> anyone know what the
> electric 9v train motor draws at full speed and what
> the rcx outputs are
> capable of contributing. I was hoping for lots of
> interesting programmed
> train layout fun, but I think I will need to work on
> either a rcx controlled
> relay system or else a mechanical device that
> physically turns the train
> riostat under rcx control before I get too excited.
> Many thanks.
What's needed in this case, I think, is a relay
actuator or something similar. Basically, what you're
looking at is a two-wire wire brick, one (the trigger
wire) that goes to the RCX and operates a switch or
"gate" and another (the supply wire) that feeds
directly out of another power pack. Easiest way to do
this: a power transistor (or an SCR if you don't care
about speed regulation) wired into a brick. The
transistor is controlled off of the RCX's output, and
you most likely wind up using substantially less RCX
power in the process, since you're using it only for
the signal, not the voltage.
See what discussions about introductory electronics
textbooks get you? Here I am, showing off after buying
the damn Mims book...
/Brian
=====
--
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Message has 1 Reply:
 | | RE: Lego trains and the RCX
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| If you just want to turn the trains on and off, without speed control from the RCX, you can build a relay out of a motor, and a Lego switch. Run the trains from the train controller through the switch. Hook up a motor to the RCX to move the switch. (...) (25 years ago, 2-Dec-99, to lugnet.robotics)
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