Re: Sensor location

["David Gumbrell" <david.gumbrell@xxxxxxxxx>]

Hi Jon,

PIR placement depends on the characteristics of the sensors. If you are
using them for presence detection then consider three factors:

1) Maximise chance of catching movement that is entry to a room
2) Maximise chance of catching small movements when occupying typical
seating/working position
3) Minimise chances of ctahcing movement in adjacent rooms through open
doors

I use 360 degree sensors, ceiling mounted, usually moreorless over most
occupied seating position and offset from centre line of any doors. If you
can get the datasheet for the sensor it may give the sensor pattern,
usually
a grid of dots projected onto a plane surface.

IR receiver - consider where remote will typically be used from and where
it's beam might end up so that "natural" holding position can be
used. I
have combined receiver/transmitters, so I also try to consider reasonable
angles to controlled equipment for the "blaster". But for
receiver only I
would probably put nearer the equipment location, since that is where the
remote will habitually be pointed.

The problem with the centre of ceilings is that there is often a light
fitting there :-)

Cheers,

David

On 9/8/06, Jonathan Shaw <semi.jon@xxxxxxx> wrote:
>
>   I am beginning to get my head around the infrastructure required to
> automate my home, but I am more vague about where sensors etc should
be
> located which is affecting my planning of cable routes.
>
> e.g.
> is a ceiling based 360 degree PIR a good place of occupancy sensing or
> is corner mounted better?
> IR receiver - best in centre of ceiling?
> What about temperature - would near a light switch be good? It is
chest
> height but if the door is open it may misread - but is there a better
> place?
>
> TIA
> Jon
>
>
>


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