Re: Sensors for doors & windows & ...

["Karam Karam" <kzkaram@xxxxxxxxxxx>]

I'm pretty sure the Maxbotix sensors have analogue output variants -
so you could interface 4 at a time into IDRANet via the QAI (4x
analogue input) modules. What are you trying to achieve overall?

Karam
IDRATEK LTD


--- In ukha_d@xxxxxxx, Chris Hunter <cjhunter@...> wrote:
>
> Gerry's boards ... presumably as in :
>
> http://www.rgbled.org/maxbotix/index.html
>
> up to twelve sensors per board sounds pretty useful !
>
> our PC has four RS232 sockets, one maybe two being spare ... so
could
> be good for us, too (assuming I can link to Cortex) ... !
>
>
> Chris
>
>
> On 27 Oct 2007, at 12:23, Kevin Hawkins wrote:
>
> > I'm intending using some of the Maxbotix ultrasonic sensors
pointing
> > slightly diagonally across the doorways.  These then provide a
> > direction
> > indication for a person moving into or out of a room  (short to
> > long or
> > long to short reading) and based on distance you can elimate
outside
> > false trips.  I use Gerrys boards, only played so far but seems
> > viable,
> > fortunately I have deep doorways in walls often 3 foot thick. .
A
> > top
> > mount sensor might even identify people based on height- or the
dog .
> >
> > I also have some Pulsor -strain sensors arriving any day now -
which I
> > hope to use on the stairs and a couple of doorways.
> >
> >      K
> >
> > Chris Hunter wrote:
> >>
> >>
> >> 'thinking of sensors for doors & windows ... and the
limitations
of
> >> the reed-switch (just open or closed & no certainty on
what it's
> >> telling about the door, unless perhaps it's attached to the
locking
> >> mechanism in some way - which can't see how to do as a retro-
fit) ...
> >> was trying to think how else ... strain-gauge ... laser +
mirror ...
> >> all have just-as-bad limitations ... hmmm ...
> >>
> >> 'wonder if PIRs are all the same ... obviously not, but in
the
sense
> >> of being designed to pick-up just movement .... are there
some
that
> >> are designed to pick-up position, say, or presence not
associated
> >> with movement, or movement of hard but not soft objects, or
... ?
> >>
> >> with MHVR, having doors or windows open might be expected to
affect
> >> the pressure in the house ... so, all closed => some
pressurisation,
> >> maybe, depending on the relative speeds of the inlet &
outlet
> >> fans ... 'wonder if adding air-pressure-sensor(s) to each
room
could
> >> be useful ... picking-up both level & fluctuations ...
and so
doors
> >> open, people moving-about, curtains wafting, pesky flies,
> >> whatever ...
> >>
> >> micro-phones are air-pressure sensors, of course ... wonder
if a
> >> broad or limited bandwidth one would be best ...
> >>
> >> hmmm ... would fuzzy logic be the thing, to make it work ...
looked-
> >> up Wiki, but 'am really none the wiser, 'though it did
mention
> >> pattern recognition as being an application for it ...
> >>
> >> rambling, sorry, but I feel there's a glimmer here !
> >>
> >> or maybe I'm clutching at straws ...
> >>
> >> Chris
> >>
> >>
> >
> >
> >
> >
> >
> >
>