🚀 go-pugleaf

In article <105342@bu.edu>, Rajminder Singh writes:

> Hi,
>       I was just curious to know how motion sensors work ? We have one
> installed in our lounge which turns the lights 'On' when someone enters the
> room. If someone moves in the lounge, an LED mounted on the sensor turns on
> and goes off as soon as the movement is stopped - is this a pressure
> transducer at work ?
>       
> Rajminder Singh
> 

        Also, does anyone know of a way to RF-proof motion sensors.  Being
a ham radio operator on packet, I like to leave my radio running when not
attended.  We also have a security system with IR motion sensors, and my
father works for the local Gas Company and their trucks have computers in
them.  The combination of all this results in an alarm (I'm forced to lower
my power to 0.25W and he has to make sure that the truck computer is OFF
when the system is armed).  We have reason to believe that the RF is
tripping a sensor ITSELF rather than being induced in the wire run
connecting the sensor to the control box.  Has anyone diddled with this
before?  I know this message is put together sloppily, my apologies.  This
isn't as complete a story as I'd like to post, but if someone has already
been through the same thing, they already know what I'm talking about.

PS. this is really fun with those people who have motion lights outside. 
My HT (portable) reallys drives those things wild on 440MHz.  Really makes
the people look too when a light set to detect someone standing right at
their patio door (ie. a snooper) goes off repeatedly and they can't see
anyone :-).  A side effect, not a prank I pull on purpose, BTW.

--
 Craig Lemon VE3XCL (Advanced) - Kitchener, Ontario. +1 519 741 0297
 clemon@lemsys.UUCP clemon%lemsys@xenitec.on.ca  | 1B Electrical Engineering
 TCP/IP: ve3xcl@ve3xcl.ampr.org [44.135.84.51]   |  University of Waterloo
 AX.25 Packet: ve3xcl@ve3euk.#SWON.ON.CAN.NA     | Waterloo, Ontario, CANADA