RE: Re: Occupancy Sensors and No Light Switches

["paul gordon" <paul_gordon@xxxxxxx>]

I've used some of these proximity systems in various workplaces in the
past,
and I have always found the absolute limit of the range of detection to be
about 18 inches. - just enough to clip the proximity card to a shirt
pocket,
but invariably still requires that you lurch sideways and thrust your chest
out towards the reader!!

Makes for intersting viewing on a Friday afternoon!!!

Paul G.

>
>Such devices have been available commercially for some years, although
I
>have no idea who makes them, or how much they cost. Dad's workplace
used to
>handout smartcards (about the size of a thick credit card) which would
>unlock doors to rooms you were allowed in when you got close enough.
Some
>place in Cambridge had a similar system to divert telephone calls to
the
>nearest telephone to you (not necessarily the nearest *accessible*
>telephone
>though).
>
>The flaw with these solutions is that they require a reasonbly large
token
>to be carried. I have enough clutter in my pockets already, and
sometimes,
>I
>don't wear pockets ;-0 Wandering to the loo at 2am only to stumble
around
>in
>the dark, be denied access to the bathroom, and trip the alarm - would
not
>be good, especially if it happened to wifey...
>
>Counting people in and out of rooms also seems prone to error. Two
people
>following each other could be hard to spot using a beam break system. I
>suspect sneaking past the beam would become a bit of a game too...
>
>The best solution (to my mind) is the camera idea. Cameras are getting
>cheaper, and have a primary/secondary use in terms of acting as
security
>cameras. It sounds complex and requires a fair bit of hardware though,
so
>doesn't sound too elegant.
>
>2p for the weekend.
>
>Ray.
>
>
>
>

________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com


------------------------------------------------------------------------
Redecorating your house, but can't see to come up with the money?
Rate businesses in your area to win $5,000. HURRY--CONTEST ENDS 6/30
http://click.egroups.com/1/5551/9/_/2065/_/961846363/
------------------------------------------------------------------------