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.admin.nntp
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Date:
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Mon, 2 Jun 2003 14:06:10 GMT
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Viewed:
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3265 times
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In lugnet.org.ca.rtltoronto, Larry Pieniazek wrote:
> In lugnet.org.ca.rtltoronto, Larry Pieniazek wrote:
> > In lugnet.org.ca.rtltoronto, David Koudys wrote:
> >
> > <snip>
> >
> > Regarding reverse loops and DCC I seem to recall that it's possible to
> > automate them so you don't have to cut gaps that the motor has to coast
> > across
> >
> > See this track diagram
> >
> > http://members.shaw.ca/sask.rail/dcc/loop.html
> >
> > Then consider what would happen if you had a sensor to detect which way the
> > train was entering, which operated the switch (if necessary) shown in the
> > diagram to align the loop portion correctly.... then while the train was on
> > the loop section, the switch was thrown again (reversing polarity on a
> > running DCC controlled motor will NOT cause it to reverse direction) and the
> > train exits with never a "shorted out across the gap" opportunity.
> >
> > Surely a clever roboticist could do this in all LEGO. Especially if you had a
> > motorised switch anyway... the "detect which way the train was entering"
> > could be the same as "throw the switch to control which way the train enters"
> >
> > In fact maybe someone already wrote about this here and I forgot?
> >
> > see also: http://www.hobbylinc.com/htm/mrc/mrcad520.htm but that's non LEGO.
> > sort of defeats the point of the RCX DCC, ne? and
> > http://jdb.psu.edu/nmra/dcc-faq.html which discusses things to avoid if you
> > want your controllers to live longer. In fact there are lots more good
> > reading articles via google:
> > http://www.google.com/search?q=DCC+reverse+loop&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
> > (where I found all these)
> >
> > Hope that helps, sorry if it's a little vague
Actually it makes perfect sense--and could be definitly rigged up with a
polarity switch/train sensor/RCX.
I like it. I like it alot. The only thing is that it's yet another RCX and I
only own 4, 2 with the AC adapter. The gaps work remarkably well, as long as
the gap is long enuf to encompass the entire wheelset. Tonight I may try to get
two motors on the same Loco # and put them on the same engine, and see how well
that performs across the gap--one motor should always be drawing power then.
I also may try the polarity switch idea--pure LEGO, and see how that goes.
Again, this is great stuff.
Dave K
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