Automatic feeder that can detect which cat wants to eat ?

Hello,

We have 2 cats, and unfortunately one will eat anything in either food bowl.
Our other cat is a little more fussy, only wanting to eat a little at a
time. But of course when she comes back for 2nds all her food has been eaten


We've tried various ways to resolve this, but what would be perfect is an
automatic feeder which detected which cat was there, only opening when
necessary.

We've seen catflaps that have a detector in the collar the cat wears, thus
preventing any other cat entering - is there anything like this for feeders
?

I don't think there is, and we've checked with local pet shops, plus phoned
a couple of manufacturers but no one seems to have a solution.

Any help is appreciated.

N & J