The Nice People Thread, No.16: A Universe of Niceness.

chris_m

Pyxis wrote: »

I don't know anything about PIRs, but I wouldn't have thought that one mounted inside would detect someone outside.

PasturesNew wrote: »

As it's supposed to detect motion, it was possible it would

Afraid not - it's Passive Infra Red, not visible light so the glass will block it.
Even a single pane of glass is sufficient - I have a PIR controller working a plug socket with an under cupboard light in my kitchen, saves trying to hit the wall switch with my hands full. If I close the glazed door between the hall and the kitchen, the PIR doesn't switch the light on until I've opened the door and moved into the kitchen. If the door's already open it detects me from halfway down the hall.

Pyxis

chris_m wrote: »

Afraid not - it's Passive Infra Red, not visible light so the glass will block it.
Even a single pane of glass is sufficient - I have a PIR controller working a plug socket with an under cupboard light in my kitchen, saves trying to hit the wall switch with my hands full. If I close the glazed door between the hall and the kitchen, the PIR doesn't switch the light on until I've opened the door and moved into the kitchen. If the door's already open it detects me from halfway down the hall.

Yes...... this explains it quite nicely.........

QUOTE
An individual PIR sensor detects changes in the amount of infrared radiation impinging upon it, which varies depending on the temperature and surface characteristics of the objects in front of the sensor.[2]

When an object, such as a human, passes in front of the background, such as a wall, the temperature at that point in the sensor's field of view will rise from room temperature to body temperature, and then back again.

The sensor converts the resulting change in the incoming infrared radiation into a change in the output voltage, and this triggers the detection.
UNQUOTE

PasturesNew

Pyxis wrote: »

Could you put it outside? Or is it not weatherproof?

No, although I could/will bodge together something a bit showerproof, it's intended for inside.

michaels

chris_m wrote: »

Afraid not - it's Passive Infra Red, not visible light so the glass will block it.
Even a single pane of glass is sufficient - I have a PIR controller working a plug socket with an under cupboard light in my kitchen, saves trying to hit the wall switch with my hands full. If I close the glazed door between the hall and the kitchen, the PIR doesn't switch the light on until I've opened the door and moved into the kitchen. If the door's already open it detects me from halfway down the hall.

If we drive our petrol car onto the drive the pir goes on, with the electric car it stays off - unless for some reason someone gets out before we drive into the garage, in which case it comes on.

LydiaJ

chris_m wrote: »

Eee, that's fancy - I'd assumed that you, yourself, could turn it on remotely, not that it would do it automatically based on location.

Presumably there's an override option in case it thinks that you're heading home but in reality your going somewhere else where the route happens to pass close to home?

Oh yes. I can override it either from an app on my phone or by logging into its website, and set it to be a particular temperature until whatever time I specify, until whatever time I specify, at which time it will go back to doing what it thinks is best based on the location of my phone.

Also, when you tell it what time you want the heating to come on in the morning, you have the option to say "be at x degrees C by such and such a time". It will then consider the temperature on the thermostat, the weather forecast for the location of the house, and what it has learnt since installation about the house's thermal behaviour, and decide for itself what time to turn on in order to be just nicely up to the desired temperature by the time I want to get up.

StevieJ wrote: »

Hi all, don't blame you staying in here, there are a few nasty mean spirited people out there :-)

:hello:

Drop in any time you feel like it!

GDB2222

michaels wrote: »

If we drive our petrol car onto the drive the pir goes on, with the electric car it stays off - unless for some reason someone gets out before we drive into the garage, in which case it comes on.

Do the motors in the electric car really stay that cool?

PasturesNew

michaels wrote: »

If we drive our petrol car onto the drive the pir goes on, with the electric car it stays off - unless for some reason someone gets out before we drive into the garage, in which case it comes on.

I'd probably have an old/deflated soft football on the passenger footwell, open the window and lob it out .... you know the sort.... a punctured one.

I had a PIR in my garage 15 years ago. As the approach to the garage was "a bit dodgy", I wanted to be able to drive up the dark/unlit back passage, remotely operate the garage door, get inside/light comes on, close the door ... before I got out of the car, out the garage side door in my garden.

You never know who's lurking and it was alongside a wall, the other side of which were drunk rough sleepers ... and, being a small/lone female I thought it "for the best, just in case".

On the basis of "you never know who is lurking", you have to remember too there are nutters out there. A woman was selected/followed to be sadistically murdered just 100 yards from my door one night... he'd been prowling around looking for lone females... so you never know.

chris_m

michaels wrote: »

If we drive our petrol car onto the drive the pir goes on, with the electric car it stays off - unless for some reason someone gets out before we drive into the garage, in which case it comes on.

GDB2222 wrote: »

Do the motors in the electric car really stay that cool?

Probably sufficiently shielded by the bodywork.

At a guess, with the petrol car, the PIR's either picking up heat from the radiator and grill or from the bonnet.

PasturesNew

The "new thing", oven boasting. A very strange article containing peculiar women with strange views, shiny kitchens and high heels.

As somebody who has always feared and disliked ovens.... how many do NPs have?

http://www.dailymail.co.uk/femail/article-5483795/The-women-hottest-middle-class-kitchen-craze-four-ovens.html

chris_m

PasturesNew wrote: »

The "new thing", oven boasting. A very strange article containing peculiar women with strange views, shiny kitchens and high heels.

As somebody who has always feared and disliked ovens.... how many do NPs have?

Three; one gas, one portable electric halogen and one microwave - none built in to look fancy