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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Mon, 2 Apr 2001 08:43:13 GMT
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Viewed:
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499 times
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In lugnet.trains, Allan J. Smith writes:
> Jason J. Railton wrote in message ...
>
> > Exactly what part of a _plastic_ train are we hoping to detect here anyway?
>
> How about the magnetic coupler on the front of the loco and between the
> wagons. I have found that the coupler going past has enough strength to
> attract a magnet under the track.
>
> Allan J Smith
Good point! So, a simple reed switch on the sleeper should do the trick.
The other thought I had was to isolate a short (30mm) section of one side of
the track, and bridge over it with a wire to power up both sides. This
isn't long enough a break to stop a train motor, since it picks up power at
both ends. But, you then wire up your contacts to the isolated section and
the rest of the rail, and the train motor closes this 'switch' by bridging
the isolation.
Unfortunately this only detects the motor, not any rolling stock, so it
would only trigger after a pushing train had gone past. So yes, it's
probably easier to rely on the magnets. Obviously. Doh.
Jason J Railton
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Message is in Reply To:
 | | Re: Magnetic field activated switch
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| Jason J. Railton wrote in message ... (...) How about the magnetic coupler on the front of the loco and between the wagons. I have found that the coupler going past has enough strength to attract a magnet under the track. Allan J Smith (24 years ago, 1-Apr-01, to lugnet.trains)
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