The World's Smallest PIRs

By: Brian Rhodes, Published on Jul 02, 2013

Passive InfraRed (PIR) motion detectors are critical in many security systems, yet they are often considered ugly or intrusive.

******* ***** *************, *** even ******** ** **** in ******* ************, **** are ********* ** **** and ********** **** **** plastic ******. *******, ******* has * **** ** low-profile ******** ******* ** the*** ****** ** ****. ** **** ****, we ******* ***** *******, discuss ************ *** *******.

Weaknesses ** *********** ****

*** ****** ******* *** used ** ******* ***** security *******; **** ********* alarms, ** ********** ****** Control, *** **** ***** surveillance. ******* ********* ************, traditional ******* *** ***, unsightly, *** ******** *** 'general ******* ***.' **** specialty ******* (**** *** PIRs) *** ******** ** be **** ** *** door ***** ** *** same ***, ********** ** the ****** ** ********** of ************* ** *** sensor ** *********. *********** that '*********** ****' *** a****** ****** ** '***** alarms'*** ******* ** ******* ** outsiders ** ****** *****, ******** *** ***** PIR *** *** *** makes *****.


Visonic *** ******

*** **** *********** ********** with*** ************ ** ***** ***** is *** ******* **** and *****. **** *** sensors *** ***** *** mount ***** **** ***** or **** ******. *******'* line ** ******** **** the ******** *******, **** the ******** ** *** sensor ******* ****** *** hole (* */*" ****), and ******* ~*/*" ** diameter.

**** ** * ******** benefit ** ******** ****** risk, *** **** ** aesthetic ************ **** **** sensors **** ** *******. Rather **** ***** ** beige ******* ***** ******* on * ****, *** SPY ** ******** *** less *********.


Sensor *******

*** **** ******** **** separate ***** ** *******, each ******** ** ****** movement ** * ********* pattern ** *****:

*** ************ ****** *********** suggestions ***** ** *** detection ***** *** ** the ******* ********* ************ of ********:

  • *** *:******** - * ******, long ****** ****** ***** for ********* ******** ** glassed ********* ** ******** where ***** ****** ******* may '***** *****' ***** on ***** ******* *** movement ** ******** *****.
  • *** *:***** ****: * ********** ****, but **** ***** ******, useful *** ******** **** rooms **** * **** mounted ********.
  • *** *:**** ****: *** ****** range ******, ******** ** to *** ******* ** *****.
  • *** *:**** *** ** ********: A ********* **** ******** specifically *** *** ************, but **** *** ** **** ** corridors ** * ******* 'trip ****'

Detection ******* *** **********

*******, ***** *** ********* SPY ****** *** ****** in * ***** ** situations, ********* ******* *** not ********** ** ******** - * ******* **** in ******* '**** ***' PIRs. 

Not *** ****** - **********/********** ****

******* ********* *********** ** that *** ****** ****** no '*** ********', **** is ******** ****** ******* with * ***** ****. This ** ****** ** residential ************ ***** **** may **** ********/***** ** night **** *** ***** system ** *****. ******** this ******* ****** *** SPY ****** ** ********** ** industrial ***** ** *******

Price **********

*** ******* *** ****** ranges ******* $** - $50 ******, ********* ** the ********** ****. **** is **** ********* **** many '*** ******' ********* alarm ***** **** (**: ~$20), *** *** **** expensive ** ******* ***** to ********* ******* **** RTE ** ******* *****.

**** ***** ****** *** a *******, **** ******* using ******'**** **********'**** **** ******* **** than *** (**********) **** sensor ** ****** ****** before ********. '**** ****' sensors *** **** $** up ** $***, *** the ***** ***********/ ******* sensing ***** ** * SPY *** *** ********** result ** ******* ******** with * ***** **** solution **** * **** technology ***.

Application **********

*** ******* ** ***** smaller, ******** ******* ** obvious ** **** **********. Take *** ******* *****, where ****** ** *** stairs ***** ** ** detected, *** ****** ******* of *** ********* ** not ** ***** *********:

****** **** ******* * traditional *** ** *** most ********** ****, ***** is ************ ******** **** the **** ** *** staircase, * *** *** be **** ******** ** the **** *** ***** a ***** ******* **** the ***** ** *** staircase. ****** **** ********* motion **** **** ****** feet, *** ********* **** is ***** *** **** just * *** **** surrounding ***** ******.

Biggest ********

******* *** *** ****** is ***** *** ********, sensors *** ******* ** inserted **** ***** *** doorframes, **** ** ******* that ***** ** ***** for '***********' ****** *** flush ******* *****. *** physical *********** *** *********** of *** ****** ** key ** ********, *** while *********** ******* *** limited ** ***** **** can ** ******, *** allows *** ******* **** **** more ****** *********.

**** ** ****** ******** plays * *** **** in ************ *************, ****** position *** **** ** key *** ***** *********. If *** '***** *****' risk *** ** *** by ****** ******** *** right ********* ****** ** an ***** ********, ***** SPY ***** ******* ***********, Intrusion, ****, ** *** system *****.

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