>>> My current [over]-design has RFID via a tag on the collar, IR beam
>>> detection to avoid closing the door on the cat,
>>
>> Nah, no need to worry.  You'd only be closing the door on half the cat.
>
> But what if it was the half I like?

At one stage we lived near corn fields. We had a cat ramp that ran up the 
aide of the house to a dining room window that was left ajar. On some nights 
our cat used to bring home rats or occasionally small rabbits and eat the 
upper half and leave the lower half on the kitchen mat. Cleaning up the 
bottom half of a rat or rabbit was not my favourite morning activity.

I and my wife got used to interpreting the louder than normal thump of cat 
jumping off the window sill onto the floor with extra payload and I'd get up 
and evict pussy and its unfortunate meal target for outside processing.

No RFIDs available back then and it still wouldn't have helped when the cat 
had a pillion passenger. .




   Russell

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