On 02/04/2018 10:46, Huge wrote:
On 2018-04-02, wrote:
On 02/04/2018 06:19, Brian Reay wrote:

I was discussing fitting a burglar alarm with my son-in-law and the
problem of their cat occurred to me.

While they could confine the cat to a room not covered by a PIR, the
layout of their house would make this far from ideal in a number of ways.


I can't believe I'm the first person to think about this problem- what
to the millions of people with cats/dogs do?

(Obviously not using PIRs is an option but the idea of wires etc to
window / door sensors really isn't practical. A few PIRs will 'cover'
the required rooms and I think there are routes for wiring, if we can't
find a wireless solution.)

A few months ago I asked about using PIRs with purrs (sorry, I couldn't
resist) and was told that the "pet proof" ones were not very effective.

We had one fitted in our garage in an attempt to reduce false triggering
due to bats.

It didn't work.

But then, the bats aren't pets.

More to the point bats are warm blooded and can fly and once they get
close to the sensor they look exactly like a big mammal a long way away.
A spider inside the works can also screw things up with false triggers.

We also have bats although I try very hard not to get them inside the
house at learning to fly time the odd juvenile will find some new tiny
crack that I have missed and end up orbiting the living room light.

--
Regards,
Martin Brown