passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.

Operating principles

All objects with a temperature above absolute zero emit heat energy in the form of radiation. Usually this radiation is invisible to the human eye because it radiates at infrared wavelengths, but it can be detected by electronic devices designed for such a purpose.

The term passive in this instance refers to the fact that PIR devices do not generate or radiate any energy for detection purposes. They work entirely by detecting the energy given off by other objects.

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38 khz Universal Infrared Receiver

Description The 1838B is miniaturized infrared receivers for remote control and other applications ..


3D Printer Optical End Stop Switch Module

Description: With high quality 22AWG cable line, the copper wire inside is thick. The cable line..


3DU5C Metal Encapsulated Silicon Phototransistor 0.5-1mA 880nM 10V

Product Features Product Name : NPN Silicon Phototransistor;Mode..


Advanced IR Movement Sensor Array

This IR compound eye mounted on a pan/tilt assembly can be used by a robot to track movement within ..


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Photoelectric Sensor Infrared Correlation Sensor Module for Arduino/Raspberry-Pi/Robotics Correla..


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Description: Have you ever needed a cheap way to activate something from across the room? Infra..


IR Infrared Object Sensor E18-D80NK 3 : 80Cm

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IR Infrared Obstacle Avoidance Sensor

Description :  The sensor module light is adaptable to the environment, the working voltage ..


Line Tracking Follower Sensor TCRT5000 x4

Description: 1 sensor uses TCRT5000, high sensitivity 2 four-sensor, four sensor spacing betwe..


Line Tracking Follower Sensor TCRT5000 x5

Product Description You can find the TCRT5000 sensor head here, and see its working principle. ..


Line Tracking Sensor TCRT5000 Module

Product Description You can find the TCRT5000 sensor head here, and see its working principle. ..


MLX90614 Contactless IR Temperature Sensor Module

Description Melexis' MLX90614ESF-AAA is an infrared thermometer designed for non-contact temperat..


OMRON E3JK-R4M1 IR 4Meter Sensor

Sensing method Retro-reflective without M.S.R. function Sensing distance..


Opto coupler U-type H42B6 photo interruptable switch

Opto-coupler is an infrared transmitter and photo transistor reciever and it take U shape to be fit ..