Subject:
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Re: Lego Mindstorms Controlled Train Crossing (Duel Track)
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Newsgroups:
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lugnet.robotics, lugnet.trains
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Date:
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Fri, 15 Jun 2001 06:23:57 GMT
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Viewed:
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1439 times
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In lugnet.robotics, Dean Husby writes:
> After 9 months I finally put together the Web Page for my Lego
> Mindstorms Controlled Train Crossing.
>
> I invite you to check it out.
> http://www.akasa.bc.ca/tfm/lego_traincrossing.html
Nice! I too have been tossing around something like this! My idea was very
similar, but used 4 light sensors, 2 in parallel like this:
Crossing -> | |
================================ <- Track
X1 X2| |X3 X4
X2 & X3 are in parallel, when X1 is broken, boom goes down & stays down
while either X1, X2 or X3 is broken. Similarly for X4. This means X1 & X4
can be some distance from the crossing, so the boom goes down long before
the train arrives, but raises very quickly after it leaves. Safer for minifigs!
Regards
ROSCO
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