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Radio Frequency Proximity Detector Answered

Hello, Does anyone have an instructable for building a proximity detector based on a radio transmitter and receiver? Or some other wave based method? I've viewed the IR proximity detector here on this site, but I need a transmitter/receiver based one. Yes, this is for my pet. I have 2 cats and 1 dog. I need to keep the dog out of the same areas that the cats are allowed to go into, thus the proximity detector needs to be specifically tuned to the dog. Distance does not have to be far, anywhere from several inches to a couple feet. Appreciate any comments or instructables! Thanks, Eric

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offlogic (author)2007-03-23

Ricarr- thought equipping your dog's collar with strobed IR LEDs, using an IR detector to trigger a ultrasonic tweeter "blast" to give the dog some boundaries? Just a thought.

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frank26080115 (author)2007-03-22

Did you ever see the AM radio transmitter one? You can use a normal AM radio to listen to the signal, make 3 transmitters on different channels and find them each individually I bet with some work you can even determine direction and range by receiving stronger or weaker signals

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