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Technical Documents

Passive Infrared (PIR) Motion Sensor

Application Resources

PIR Motion Sensor

EMS-00006-A

(Last updated) Jun 20, 2026

PIR Sensor

PIR Motion Sensor

Subcategory
EMS - Input: Sensors

Description

The PIR Motion Sensor is a passive infrared detection module used to detect human movement and body heat by sensing changes in infrared radiation. The commonly used HC-SR501 PIR sensor combines a pyroelectric infrared sensor with a Fresnel lens to detect motion within its sensing range. It is widely used in security systems, automatic lighting, smart homes, robotics, and Arduino projects.

Manufacturer Details

Manufacturer Part Number
HC HC-SR501
DFRobot SEN0171
SparkFun SEN-13285
Keyestudio KS0031

Technical Specifications

Product Type PIR Motion Sensor
Model HC-SR501
Sensor Type Passive Infrared
Operating Voltage 5V – 20V DC
Detection Distance 3 – 7 meters

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