Subject:
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Re: Even more Wow!! for your buck!!! was Re: Woo Hoo!!!!! (part deux...)
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Newsgroups:
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lugnet.org.ca.rtltoronto, lugnet.trains
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Date:
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Mon, 2 Jun 2003 05:05:26 GMT
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Viewed:
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276 times
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Yes, you can automate the reversing loops. In fact, using the RCX to do so
should be fairly simple, except that it takes 2 of them to do it.
(Just using 1 rail for now-)
(rcx a)rail-gap-rail(rcx b)
The two of them set the polarity the same, such that the motor doesn’t see the
difference. When the train enters onto the B section (must be detected...there
are easy ways (light sensor?- the commercial ones use voltage drop), the RCX’s
reverse the voltage seen on the a section, so that when it comes out, the
voltage is right at the join again. Because it is a AC wave on the track, the
motors still in the section don’t change speed either (except for the first
cycle in the opposite direction)
The “real” units do it in a similar manor using short circuit detection and
reversing to get the minimum delay/speed droop on the crossing of the gaps.
I’m faced with designing this into a layout by accident (oops!), so have had to
order a 2nd booster (Digitrax) for my lego layout.
James
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