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I'm trying to build a cat motion detector but, to avoid getting false alarms when a person walks by, I was thinking of using RFID. i.e. the cat has a collar and the detector senses the collar when they get within a couple of feet and makes a noise.
The problem there seems to be with RFID is that the range is so short - e.g. 4".
Anyone have a better solution?
Place an additional motion sensor such that it can only detect motion from things significantly taller than cats, and use that as an inhibitor/classifier of the cat motion signal.
What about a transmitter on the collar - Bluetooth, or a coded infra red pulse, that could be detected by fixed stations?
Battery life and safety (swallowing batteries!) would be serious considerations though...
