Re: Dual Tech motion detectors with dual relay outputs ?

[Jim <alarminex@xxxxxxx>]

On Aug 26, 2:42=EF=BF=BDpm, Marc_F_Hult <MFH...@xxxxxxxxxxxxxxxxxxxxx> wrot=
e:
> On Sat, 25 Aug 2007 18:16:09 -0700, Jim <alarmi...@xxxxxxx> wrote in
> message =A0<1188090969.600404.298...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
>
>
> Good point. (although IR and uWave are entirely different technologies --
> speaking as a geophysicist ;-)

Yes, but fall into the category of volumetric motion detectors.

>And an since we are making fine distinctions
> ;-) =A0I've never much liked the term "stress sensors" as applied here. T=
he
> sensors typically used response to _strain_.

Too fine a distinction for this conversation ...........
>
> Our floors are mostly antique, bare wood (not carpeted) =A0and getting un=
der
> the flooring is an issue. Our house was built in 1821 and I don't like
> tearing up the floor boards for what is a short-term (10-15 years ?) for
> the whims and =A0convenience for the current owners =A0(that would be us =
;-).

 but they don't necessarily need to be mounted underneath the floor.
They have a very wide range of sensitivity settings. I use them on
boat alarms and have found them to be very versitile in their
placement.


> Using An IR Motion detector as a "wall" as I now plan using the Visonic S=
py
> 4 's is different in some ways from using IR as a 'volumetric' detector.
>
> The main problem with the photo-beam approach is that for our particular
> application, it is not-trivial to make it unobtrusive. =A0A surface-mount
> photo-beam at person-height is out of the question on aesthetic grounds.
>
> A valuable suggestion nonetheless that I might be able to integrate. =A0I
> presume that there are unobtrusive ones that I just don't know about. I
> have a number of Banner industrial beams and sensors. At least one of the
> applications goes past a framed-in closet area where I can get into the
> wall easier than into solid brick walls. On the closet side I could have
> two small peep holes for the beams. On the brick side, it would be easy
> enough to embed a piece of mirror in a hole small enough and deep enough =
so
> that it is dark and not visually obvious. Or ... ?

Take a look at the Pulnix PR-5B. I use these also on boat alarms and
they last forever. It's surface mount but only protrudes from the wall
by about 3/4 of and inch. The range is only about 17 feet but it can
be increased a bit by increasing the amount of reflected area. ( ie.
using two or more or bigger reflectors)  Also, the reflector can be
covered by a dark piece of thin plastic (same as the transceiver) to
make it less obtrusive. The reflector doesn't have to stay in it's
supplied housing either. There's also another unit with a shorter
range ..... 3 feet, I think.

http://www.takex.com/productSub.php?tgid=3D2&gid=3D2.1


>
> For a narrow space like a hallway, air pressure sensors might also apply
> (with attendant falsing problems). The Brits use these some, but seems
> esoteric/unpredictable to me.
>
> Thanks for your continuing suggestions and observations ... Marc
>

Again, I haven't read the thread in great detail (so this may have
already been suggested) but there are some CCTV cameras that come with
motion detection capability and relay contact output. You'd need two,
but mounting and disguising cameras in corners, on shelves, and
possibly in normally seen household items might appeal to you also.
With cameras, the "hot" areas would be able to be set very precisely.
You'd only be using them as "motion" detectors, so you'd only have to
hook a monitor ( old TV with a composit video input) to the cameras
while setting the hot areas. You'd only need to get power and relay
output wires to the cameras back to your "panel" Sorry but I don't
remember which mfg has these cameras, but I think it's a readily
available option.


Buuuuut .... functioning in complete darkeness would be a problem,
come to think of it. Would require some sort of infrared illumination.
Oh well............................... I'll leave you with the
thought.