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Maybe I'm just too primitive but I let dogs handle it. I homestead in a remote Indian village and many stray dogs I look after instinctively take care of my property. There are false positives sometimes but that's okay. I like it when they alert me for potential small intrusions around my house, like snakes, monitor lizards etc.

> many stray dogs I look after instinctively take care of my property

Their ancient wolf-dog ancestors howl with approval. That's why we domesticated them after all.

The activation, door knob can be trivially implemented with just piezo-crystal pulse and some radio (433MHz). No battery required, either.

Wait until you hear about the data centers worth of cat pictures we generate as a species.