The HC-SR312 Micro PIR Motion Sensor is a compact and energy-efficient module designed to detect human body movement using passive infrared (PIR) technology. It senses changes in infrared radiation emitted by moving objects, especially humans.

This mini PIR sensor is optimized for low-power applications, making it ideal for battery-operated devices such as automatic lighting, security systems, and IoT projects. Its small size allows easy integration into compact designs.

The module provides a digital output signal when motion is detected, enabling easy interfacing with Arduino, Raspberry Pi, and other microcontrollers. It offers reliable detection with adjustable sensitivity depending on environmental conditions.