There appeared in our country farm a walk for other people's crops, and the question of how to save what was grown with hard work arose sharply. Well, I had to assemble a simple device of noise effect on the thief.
On the corner of the door in the greenhouse stretched the wires from the twisted pair, and at the end hanged a lamp, not a simple but with broken glass and inserted into the usual petard. At the other end, he hung a crown with a switch in the form of a lingerie plug and a band cut out of a bottle.
The miracle worked simply. The loop was tied to a thin leash across the entrance, when strained, the loop jumped out, the chain closed, the petard burned.
Practice has shown that after an unexpected cotton hunt to tear tomatoes disappears.
P.S It is better to hang 2-3 petards so that it works exactly. The power of the petard also matters.