Here is a human motion detector circuit uses Passive Infrared (PIR) sensor. PIR motion sensor circuit is a device used to detect changes in the infrared waves emitted by the human body with a wavelength of 8-12 micrometers. Of course, measurement of changes in infrared energy that is within a range of detection PIR sensor. Then later modify or encode it into an energy low frequency with small amplitude signals.
Motion Sensor Circuit PIR Focusing – FRESNEL LENS
Usually a motion sensor to sense infrared energy signal changes within a distance of about 10 inches. Focusing on infrared radiation can increase the distance detection of a sensor where it is highly dependent on the range of distance and angle of coverage. For that purpose, it is used Fresnel Lens.
Motion Sensor Circuit
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