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How to electronicly detect a pest trap has been triggered.

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johnkenyon:
The KISS principle applies here - the thing has a moving part which moves at least an inch from its armed position.

Connect two wires to the trap, and create a "normally closed" switch.

One wire connects to the trap itself.

The other wire is mechanically attached to the frame at the top, and is hooked over the arm which falls when the trap is triggered, with no slack.

When the trap is set, the wire is hooked onto the arm, circuit made.
When the trap is triggered the arm loses the wire - circuit opens, trigger detected.

When the "switch" fails, or someone nicks the trap, or the trap gets lost, all you have lost is the cost of the switch - less than 2 cents/pence/whatever's worth of wire.


soldar:
That trap looks mean. I'd keep my fingers well clear of it.

The same as stepping on the trap releases a spring which actuates the kill bar, it should not be difficult to set a (mechanical) trigger that raises or lowers a flag or sign when the trap is triggered. No need for electricity. That would be fun.

OTOH, Shawn Woods has a YouTube channel where he has tested hundreds of different traps, some of them with remote radio notification.

Marco:

--- Quote from: johnkenyon on June 21, 2019, 09:57:10 am ---The KISS principle applies here

--- End quote ---
Just don't mix up the S's.

Adding an extra step for resetting the trap, which might mechanically interfere with its operation and which relies on predictably unreliable electrical contact ... I don't think whomever has to reset the trap would consider it simple. Whereas something under the treadle would be completely invisible, irrelevant during normal maintenance and could be made highly reliable with non contact sensing.

icharters:
Use a commercial surface mount security alarm contacts.  They come with plastic shims to keep the magnet and reed switch away from the metal.  They also screw into the trap so it violently closing isn't going to dislodge them.  You can get them in NC, NO, NO+NC types.

Honeywell 7939WG -> https://www.security.honeywell.com/product-repository/7939wg

Dubbie:
I think you are 100% on the right track with the vibration sensor.
Means your unit can be completely sealed and just velcroed to the top of the tunnel or something. No wires or other complicated mounting.

I'm interested to hear what you are planning for the Radio also. I looked at something for an almost identical use case. However I couldn't figure out a radio scheme that would handle the distances required, considering it would be on the floor of dense bush. 

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