On Monday, 4 June 2018 20:16:31 UTC+1, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Friday, 1 June 2018 20:21:20 UTC+1, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Friday, 1 June 2018 12:00:27 UTC+1, whisky-dave wrote:
On Friday, 1 June 2018 11:11:54 UTC+1, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
I wonder if such a system would detect my cat sitting on the sofa
in
front of the TV.

You need a nice old CRT set. The cat would then sleep on that - the
hottest part of the room. Tail dangling over the picture.

Actually I've never had a cat sleep on a TV, my scanner is the only
thing
that my cat has slept on that I wouldn't think of as a good place to
sleep for any lenght of time. Even as a kid living with my parent who
had
upto 4 cats at a time, they never slept on the TV always chose
someone's
lap.
Where they did spend a lot of time sleeping was in the kitchen on top
of
the wall cabinets as it was far warmer, darker and quiter there.

But I know cats do like to sit on warm things like TVs given the
chance.

So what ones don't see pets ?

The ones designed to not see pets.

I see you have no understanding of this,

We'll see...

what technology do they use to NOT see pets

With cats and smaller dogs, ones that can detect the rough
size of the animal which is quite different to a human.

What are the rough difernces in size between a st. bernard and a 9 month old sprog. ?


With some others for dogs particularly, ones that can
distinguish the height of the animal and recognise that
few humans choose to enter the room lying on the floor etc.

So not very good then are they.
Why not just be honest and say the PIR depends on the size rather than species ?


And regardless of how they do it, even you should be able
to work out that some do offer sensors that dont see pets.

Some claim to.
But all species pretty much give off the same wavelengh IR which is what PIRs detect.


and what do they class as a pet would a police dog be seen as a pet ?

Keep this **** up and your **** will be flushed where it belongs, again.

How about a guard dog wandering around the premises can they be detected or not ?


I would to know what technolgy they use to tell a
pet from a guide dog, to an elephant to a mouse.

Even you should be able to google it, if someone
was actually stupid enough to lend you a seeing
eye dog and a white cane, again.

would a seeing eye dog trigger a PIR ?

you do know that even a white can would.