This sensor requires settling time, which is characteristically in the range of 10 to 60 seconds. If once it detects the motion, then the output goes high for a couple of seconds and then returns to a normal state or low. If once the sensor gets warmed up, then the output remains low until it detects motion. Primarily, this sensor consists of Fresnel lens which are bifurcated to detect the infrared radiation produced by the motion of a hot body over a wide range or specific area. The difference between these two signals is generated as the output signal. Thus, one half generates one signal by detecting the motion of a hot body and the other half generates another signal. The PIR sensor internally is split into two halves, one half is positive and the other is considered as negative. Thus, the infrared radiation detected by the sensor generates an electrical signal that can be used to activate an alert system or buzzer, or alarm sound. then it detects the infrared radiation emitted by a hot body motion. Whenever, human being (even a warm body or object with some temperature) passes through the field of view of the PIR sensor. The PIR sensor circuit is having ceramic substrate and filter window as shown in the figure and also has dome like structure called as Fresnel lens.
The PIR sensor circuit consists of three pins, power supply pin, output signal pin, and ground pin.
The following figure is the diagram of Spectral Response of Window Materials. The following figure is the diagram of AM412's typical application. The following figure is the diagram of the AM412 dimension. The breadboardless connections let you connect expansion modules like potentiometers, sensors, relays, servos, buttons in a plug and play way. You can also connect Arduino compatible boards easily with various digital, analog, and I2C /Uart interfaces. Pi Supply Octopus Electronic Bricks can be used to build electronics projects just as easy as piling bricks.
Low voltage, low power consumption, instantaneous settling after power up.Excellent power supply rejection, Insensitive to RF interference.Built-in filter, screen the interference by other frequency.Two-way differential high impedance sensor input.This blog will introduce AM412 systematically from its features, applications to its specifications, PIR sensor circuit, also including AM412 datasheet and so much more. Only a power supply and power-switching components need to be added to make the entire motion switch, a timer is included. This Smart digital detector offers a complete motion detector solution, with all electronic circuitry built into the detector housing.
AM412 is a new digital intelligent PIR sensor.
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