Thanks for all the answers. I thought that maybe some RFID trickery could b=
e the answer, but since I have heard a few stories about one cat learning t=
o open a RFID door for another cat*, I'm not sure how to tackle the problem=
.. The idea of something like this automatic food dish AND a very narrow tub=
e to get to it could work. Need to do some testing...

* and witnessed it once, let's call them Blinky and Pinky ;-), when Blinky =
wanted to get out he called at the door his friend Pinky, who would just le=
an near the door, thus becoming the "key", until Blinky was out.

>> Il giorno 2-gen-2016, alle ore 20:16, Bob Blick <bobblick@ftml.net> ha s=
critto:
>>=20
>> On Sat, Jan 2, 2016, at 10:08 AM, rossano gobbi wrote:
>> Speaking of cats... what would you people do in this case?
>>=20
>> I've got 4 of them, let's call them A,B,C and D. Cat A must eat a specia=
l
>> food, let's call it "1". Cats B and C must eat another special food I'll
>> call "2". While cat A's diet must be absolutely strict otherwise really
>> bad (for us living with him) things happen, cat B and C's diet can
>> tolerate exceptions. Cat D could eat whatever he wants but we'd like him
>> eating his normal food "3", instead of the other two. Needless to say,
>> everyone, except B, likes better the food that isn't his.=20
>> We usually do this procedure by hand, by feeding them only once or twice
>> a day and watching them, but doing the cat-police is getting more and
>> more annoying so I'd like to introduce some level of automation...
>> Any hint? :-)=20
>> A late happy new year to all of you!
>=20
> Hi Rossano,
>=20
> This is a food dish that only opens for the chosen cat or cats. A little
> expensive but it's probably been tested and debugged. I have several of
> their pet doors and they work pretty well. One of them even has a PIC in
> it :) If nothing else, watch one of their videos to get some ideas. RFID
> readers and hobby servos are cheap!
>=20
> https://www.sureflap.com/en-us/pet-feeder/microchip-pet-feeder
>=20
> Hope the link works for everyone, they have geolocation in their web
> server and although they are a British company I can only see their US
> site.
>=20
> Happy new year!
>=20
> Bob
>=20
> --=20
> http://www.fastmail.com - Accessible with your email software
>                         or over the web
>=20
> --=20
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist

--=20
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View/change your membership options at
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.