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Author Topic: Pet immune motion sensor  (Read 8240 times)

Ginger

  • Guest
Pet immune motion sensor
« on: June 22, 2004, 06:28:53 AM »

Where can you buy a pet immune motion
sensor for the x10 system?
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DJ MIKE

  • Guest
Re: Pet immune motion sensor
« Reply #1 on: June 24, 2004, 05:47:26 AM »

GINGER - NO NEED. YOU ALREADY HAVE ONE IF
YOU OWN AN INFRA-RED MOTION DETECTOR. A FEW
YEARS BACK I INSTALLED RESIDENTIAL AND
COMMERCIAL ALARM SYSTEMS. SOMETIMES IT
REQUIRES A LITTLE ADJUSTMENT BUT HERE'S WHAT
YOU DO...  THE INFRA-RED LENS (WHITE
TRANSLUCENT PLASTIC)HAS MULTIPLE FOCAL
POINTS ON THE LENS. WHEN SOMEONE OR ANIMAL
(SAME DIFFERENCE FOR SOME) WALKS ACROSS THE
IR'S FIELD OF VIEW, THOSE FOCAL POINTS CAUSE
THE INTENSITY OF THE INFRA-RED (BY THE WAY
THE INFRA-RED SPECTRUM LIES JUST "BELOW"
HUMAN VISIBILITY, NOT ABOVE, AS MOST THINK.
IT STARTS JUST BELOW OUR COLOR RED) THE LENS
CAUSES SOURCE TO SLOWLY CHANGE FROM BRIGHT
TO DIM ON THE INFRA-RED SENSING DIODE, WHICH
HAS BEEN PROGRAMED TO INFORM US OF A
POSSIBLE INTRUDER. IF YOU PET IS NOT THE
INTRUDER, SIMPLY TAKE A 1/4 INCH PEICE OF
BLACK ELECTRICIANS TAPE AND COVER THE FIRST
LOWER (SMALLEST) ROW OF FOCAL POINTS.  THOSE
ARE THE MOST SENSITIVE TO SO
CALLED "MOVEMENT" (MORE ON THAT ANOTHER
TIME). THAT SHOULD DO IT. SOMETIMES YOU HAVE
TO PLACE A LITTLE WIDER PIECE TO INCLUDE
BLCKING THE LOWER HALF OF THE SECOND ROW UP,
DEPENDING ON THE PET.  NOW, IF ANYONE WANTS
TO IMMUNE A HORSE FROM AN INFRA-RED... NOT!

DJ MIKE
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zach1234

  • Guest
Re: Pet immune motion sensor
« Reply #2 on: June 23, 2008, 12:05:36 PM »

Just what I was looking for. Could you use white electrical tape.  :)+
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PajamaGuy

  • Hero Member
  • *****
  • Helpful Post Rating: 32
  • Posts: 522
Re: Pet immune motion sensor
« Reply #3 on: June 23, 2008, 04:02:18 PM »

... and remember, motion sensors sense heat moving across its field of view.  Its sensitivity is dependent upon the difference of the ambient air temperature vs. the temperature of a mass moving in its view (rent the movie "Sneakers") - A person just out of a steam bath will be detected sooner than one just coming in from 20 below zero.

Also - when positioning motion sensors, do NOT put them where masses of hot air pass too close - e.g. above your Home Theater, over a radiator. or where your HVAC can send a blast of hot air in front of it.
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PajamaGuy
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