The World's Smallest PIRs

By Brian Rhodes, Published Jul 02, 2013, 12:00am EDT (Info+)

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

******* ***** *************, *** **** ******** by **** ** ******* ************, **** are ********* ** **** *** ********** look **** ******* ******. *******, ******* has * **** ** ***-******* ******** sensors ** ****** ****** ** ****. ** **** ****, ** ******* these *******, ******* ************ *** *******.

Weaknesses ** *********** ****

*** ****** ******* *** **** ** several ***** ******** *******; **** ********* alarms, ** ********** ****** *******, *** even ***** ************. ******* ********* ************, traditional ******* *** ***, *********, *** designed *** '******* ******* ***.' **** specialty ******* (**** *** ****) *** designed ** ** **** ** *** door ***** ** *** **** ***, regardless ** *** ****** ** ********** of ************* ** *** ****** ** tampering. *********** **** '*********** ****' *** a****** ****** ** '***** ******'*** ******* ** ******* ** ********* ** unlock *****, ******** *** ***** *** *** the *** ***** *****.


Visonic *** ******

*** **** *********** ********** ******* ************ ** ***** ***** ** *** smaller **** *** *****. **** *** sensors *** ***** *** ***** ***** with ***** ** **** ******. *******'* line ** ******** **** *** ******** surface, **** *** ******** ** *** sensor ******* ****** *** **** (* 3/4" ****), *** ******* ~*/*" ** diameter.

**** ** * ******** ******* ** reducing ****** ****, *** **** ** aesthetic ************ **** **** ******* **** at *******. ****** **** ***** ** beige ******* ***** ******* ** * wall, *** *** ** ******** *** less *********.


Sensor *******

*** **** ******** **** ******** ***** of *******, **** ******** ** ****** movement ** * ********* ******* ** range:

*** ************ ****** *********** *********** ***** on *** ********* ***** *** ** the ******* ********* ************ ** ********:

  • *** *:******** - * ******, **** ****** sensor ***** *** ********* ******** ** glassed ********* ** ******** ***** ***** motion ******* *** '***** *****' ***** on ***** ******* *** ******** ** adjacent *****.
  • *** *:***** ****: * ********** ****, *** **** range ******, ****** *** ******** **** rooms **** * **** ******* ********.
  • *** *:**** ****: *** ****** ***** ******, covering ** ** *** ******* ** *****.
  • *** *:**** *** ** ********: * ********* unit ******** ************ *** *** ************, but **** *** ** **** ** ********* ** a ******* '**** ****'

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

*******, ***** *** ********* *** ****** are ****** ** * ***** ** situations, ********* ******* *** *** ********** or ******** - * ******* **** in ******* '**** ***' ****. 

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

******* ********* *********** ** **** *** series ****** ** '*** ********', **** is ******** ****** ******* **** * small ****. **** ** ****** ** residential ************ ***** **** *** **** hallways/rooms ** ***** **** *** ***** system ** *****. ******** **** ******* limits *** *** ****** ** ********** ** industrial ***** ** *******

Price **********

*** ******* *** ****** ****** ******* $40 - $** ******, ********* ** the ********** ****. **** ** **** expensive **** **** '*** ******' ********* alarm ***** **** (**: ~$**), *** are **** ********* ** ******* ***** to ********* ******* **** *** ** curtain *****.

**** ***** ****** *** * *******, many ******* ***** ******'**** **********'**** **** ******* **** **** *** (integrated) **** ****** ** ****** ****** before ********. '**** ****' ******* *** cost $** ** ** $***, *** the ***** ***********/ ******* ******* ***** of * *** *** *** ********** result ** ******* ******** **** * lower **** ******** **** * **** technology ***.

Application **********

*** ******* ** ***** *******, ******** sensors ** ******* ** **** **********. Take *** ******* *****, ***** ****** up *** ****** ***** ** ** detected, *** ****** ******* ** *** stairwell ** *** ** ***** *********:

****** **** ******* * *********** *** on *** **** ********** ****, ***** is ************ ******** **** *** **** of *** *********, * *** *** be **** ******** ** *** **** and ***** * ***** ******* **** the ***** ** *** *********. ****** than ********* ****** **** **** ****** feet, *** ********* **** ** ***** and **** **** * *** **** surrounding ***** ******.

Biggest ********

******* *** *** ****** ** ***** and ********, ******* *** ******* ** inserted **** ***** *** **********, **** at ******* **** ***** ** ***** for '***********' ****** *** ***** ******* units. *** ******** *********** *** *********** of *** ****** ** *** ** accuracy, *** ***** *********** ******* *** limited ** ***** **** *** ** placed, *** ****** *** ******* **** **** more ****** *********.

**** ** ****** ******** ***** * key **** ** ************ *************, ****** position *** **** ** *** *** prime *********. ** *** '***** *****' risk *** ** *** ** ****** sticking *** ***** ********* ****** ** an ***** ********, ***** *** ***** improve ***********, *********, ****, ** *** system *****.

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