I've been working on perimiter security on my house. PIR is just to flakey for me.
Im working on IR laser trip beams for the front yard, the back yard is fenced. I could try and bounce a beam around with mirrors, but seems like it would be very finicky to adjust.
Is there a way to build a capacitive touch sensor that would work with such a large object? That way when someone touched the gate, or grabbed the fence to jump it, it would trip.
Would it even work with the fence being grounded? If not, what if I insulated the top bar, which would be doable, it would then not be grounded, could I build a CT sensor that would
sense maybe 200' of 1" mild steel pipe?
If not, I wonder what would happen if I energized the bar with a mild DC source, like 5VDC, not enough to even feel, but could I monitor it and sense a dip when someone touched the pole?
Im not horribly paranoid, just some activity in the neighborhood got me thinking, and im in need of a project. I definitely dont want motion sensors \ PIR because I want this to be a 99% accurate system.
Unfortunately I dont know much about capacitive touch other than plug and play chips. Maybe you guys can give me some pointers, or just tell me its impossible.