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I am using Cabooses industries ground throws to operate my Atlas O turnouts and I am trying to come up with a way to sense the position of an Atlas O switch.   I want to do this so I can control signals to indicate the position of the turnouts.   I was thinking that if I could attach a magnet to the end of the throw bar opposite where the ground throw is positioned and use a reed switch to sense its location,

My question is how to use the reed switch to actuate a SPDT relay so I could switch 12 volt lights in a MTH signal.  Also, not having worked with reed switches, any suggestions for reed switches and compatible SPDT relays?

I appreciate any thoughts that you may have about this idea.

Thanks,

Don

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With Ross switches and Caboose Industries ground throws, I use micro switches.  These are a single-pole, double-throw relay.  It has 3 terminals to connect wires: common, normally closed and normally open.

Here are a dozen for about $7.

https://www.amazon.com/MXRS-Hi...ifQ%3D%3D&sr=8-2

Here is one of them on my layout.  A piece of cork shims it so that the lever lines up with the throw bar.  With this switch set for "straight", the common (bottom terminal) is connected to the normally closed terminal.

micro 1

When the switch is thrown to "diverging", the lever is pressed and the common terminal is connected to the normally open terminal on the micro switch.

micro 2

You can also mount these so that the ground throw moves the lever directly.  Note that I had to bend the lever so that the ground throw would hit it.

micro 3micro 4

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Images (4)
  • micro 1
  • micro 2
  • micro 3
  • micro 4

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