This design introduces a design plan of the PIR sensor system, circuit and its assembling, debugging. The Application Circuit of the passive PIR alarm uses the invisibility of the infrared radiation well into the alarm system, and in order to achieve the anti-theft alarm and security purposes. When the body goes into the range of PIR sensor detection, sensors will detect heat sources and then the sensor will output a weak signal. The Signal should be amplified, compared and delayed; finally light emitting diodes emit light, playing the role of a police alarm.
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Haoting Liu, Yicong Zhang, "The design of infrared information collection circuit based on embedded technology," Proc. SPIE 8878, Fifth International Conference on Digital Image Processing (ICDIP 2013), 88783P (19 July 2013);