RE: Stair Mats

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

Tony,

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

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

1,2,3,4 - UP
1,2,3 - UP
1,2,4 - UP
1,3 - UP
1,3,4 - UP
2,3,4 - UP
2,3 - UP
2,4 - UP

4,3,2,1 - DOWN
4,3,1 - DOWN
4,2,1 - DOWN
4,2 - DOWN
3,2,1 - DOWN
3,2 - DOWN
3,1 - DOWN

Actually - now I've done that, it's clearly a lot easier... all I need to
look at is the FIRST mat pressed, and I can work out the direction - if
it's 1/2, then someone's going up - if it's 3/4, then someone's going
down

Obviously, no-one in my house is a 3-stepper.

- I'm too fat
- Mary's too short
- Phillippa's too unable to walk yet

Regards,

Mark


-----Original Message-----
From: BUTLER, Tony, FM [mailto:roaming@xxxxxxx]
Sent: 15 October 2002 11:20
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] Stair Mats


> > I can imagine that I'd want to know whether someone was going up
or
> down
> > stairs, and given that someone might only tread on alternate
stairs,
> > there's some subtlety...
> 
> I use one at the bottom of the stairs with a PIR at the top, 
> works well
> and filters out "false" instances of a light coming on.

Ah, but this won't catch the case of the alternate step person- perhaps
u
need one on the 1st two stairs - or indeed, to catch the wiley
3-stepper,
the 1st three steps :-)

T.


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