:: I would probably use Sureflap doors, which can
:: be trained to trust each cat's implanted RFID microchip. And if I
:: had multiple cats I'd hack the door to get the RFID numbers to track
:: each one separately.

Rolling my own has been on my to do list for some years now. I had thought=
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of using the implanted microchip but I thought that with the standard=20
passive range of RFIS of about 2-3" this wouldn't allow enough time for a=20
chased moggy to be recognised and the flap unlock,  ending up with said=20
moggy wearing the catflap. I assume you've found this not to be the case?

Colin
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cdb, colin@btech-online.co.uk on 26/06/2011
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