That's t'he definition of (entertaining) overengineering: since every house cat should have an RFID chip already, there are doors that use that already. 4 AA batteries, "low-tech" enough, it just works

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sillysaurusx 3 days ago | parent [-]

How do you interface with your cat’s chip? Mine is chipped but it never occurred to me to build a detector.

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darkwater 2 days ago | parent | next [-]

In my case I bought a pre-built solution by PetSafe that works pretty well. You scan the catś chip once and it recognizes him/her each time they try to enter. It supports up to 10 cats IIRC

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donavanm 3 days ago | parent | prev | next [-]

You can get off the shelf doors and feeders. I use “sureflap.” The rfid pellets vary slightly based on locale and age, but probably 125 or 132khz. You can get them off of ebay if you want an easier test case. Handheld cheap scanners are about $20.

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DannyBee 2 days ago | parent | prev [-]

125khz reader. The real problem is distance most of the time. Cats are curious enough about the doors that they will go right next to them. Most dogs won't.

	▲	Doxin 2 days ago \| parent [-]
		Luckily dogs are usually pretty easy to train. My dog will tap the glass on the back door if he wants out. I'm sure I could get him to "present his chip" to a doggie door within a couple of days.