The HC-SR505 Mini PIR Motion Sensor Module is a compact and precise infrared sensor designed to detect human body movement. Using passive infrared (PIR) technology, it senses changes in infrared radiation emitted by moving objects, especially humans.

This module is smaller and more compact than standard PIR sensors, making it ideal for space-constrained and low-power applications. It provides a digital HIGH/LOW output when motion is detected, allowing easy integration with Arduino, Raspberry Pi, and other microcontrollers.

With low power consumption and reliable performance, the HC-SR505 is widely used in automatic lighting systems, security alarms, and smart home applications. Its fast response and stable detection make it suitable for both beginner and professional projects.