Pyroelectric infrared language alarm device principle circuit

Published:2011/5/6 1:19:00 Author:Jessie | Keyword: Pyroelectric infrared, language alarm device | From:SeekIC

Pyroelectric infrared language alarm device circuit is shown in figure 2. Circuit is composed by pyroelectric infrared sensor, signal processing circuit and language alarm circuit. When people enter exclusionary area, pyroelectric infrared sensor (PIR) namely receive frequency 0 1 ~ 8Hz's infrared signal of the human body, and converts it into electrical signal, the resistance, capacitance C2 and C4 compose thelow pass filter circuits, filter high frequency interference noise, send to pin 14 of IC1, the signal is amplifered by internal level 2, after identified by two-way range in IC1, through the logic control circuit output high level from pin 2 of IC1, its time determined by R12, C12 in the circuit.



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