Subject:
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Re: Magnetic field activated switch
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Newsgroups:
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lugnet.trains
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Date:
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Sat, 31 Mar 2001 12:17:16 GMT
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Viewed:
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419 times
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In lugnet.trains, Sam Hastings writes:
> Hi all,
> I want to make a magnetic field activated switch for my level crossing, that
> will activate when some sort of rolling stock comes near - it's annoying
> having to dive at the switch every time a train goes through - it could
> damage my very neat little town!!! Any of you lot know how to do this, send reply 2 this msg, w/ details, btw, u can e-mail me w/ diagrams at
> samjh@hotmail.com - Ta!
> Sam Hastings
I've got a better idea. Raise a length of track by a single plate, then
leave two pieces completely unsupported. Just to one side of the join of
these two, mount a microswitch under the track, or mount a Mindstorms touch
switch vertically on the outside of the track. The weight of a train will
cause the track to dip and trigger the switch. For more sensitivity, raise
the track on foam instead of plates, or just raise one side of the track (or
the inside of a curve), with the switch on the opposite side.
Jason J Railton
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Message has 1 Reply:
 | | Re: Magnetic field activated switch
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| (...) Is it possible that the magnetic field generated from flux in the track current caused by the running train might trigger some false detections ? In lugnet.trains, Jason J. Railton writes: (...) I've been thinking of making a pneumatic weight (...) (24 years ago, 31-Mar-01, to lugnet.trains)
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Message is in Reply To:
| | Magnetic field activated switch
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| Hi all, I want to make a magnetic field activated switch for my level crossing, that will activate when some sort of rolling stock comes near - it's annoying having to dive at the switch every time a train goes through - it could damage my very neat (...) (24 years ago, 30-Mar-01, to lugnet.trains)
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