RE: Stair Mats

["Kenneth Watt" <kwatt@xxxxxxx>]

> EXACTLY! That's the problem I'd been thinking of. It's more
complex
still,
> since a 2-stepper might not ALWAY 2-step.

You're thinking to hard about this guys! ;)

Basically, I have one matt on the bottom stair, since my stairs go
round
90o the chances are this *is* the first step taken as you need to step
and turn, on a set of straight stairs I reckon two would suffice at
most. The reason being that in 90% of normal daily use you would
probably hit one of the first two stairs, or most people would anyway.

There is a PIR at the top of the stairs as I do not want it activated
by
movement downstairs, this PIR is cunningly positioned to pick up
movement from just over half ways down the stairs, so, even if someone
does miss the matt, the PIR gets them.

> I guess I need _4_ mats, and depending on the order they're
pressed
in, I
> can work out what's happening:

Why do you need to work out what's happening using this? Use the matt
to
detect a presence on the stairs then use the PIRs to detect the next
movement to logically determine what to do.

If the matt is triggered, then the PIR then someone has obviously gone
upstairs and vice versa.

Admittedly not foolproof, but then little is in HA. The only reasonably
foolproof way I can think of to determine whether people have gone up
or
downstairs is to use a beak-beam at the top and bottom of the stairs,
that would do the trick, but then not as cheap.

K.

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