The PIR Motion Sensor HC-SR501 is a highly reliable and widely used motion detection module designed for robotics, automation, and embedded electronics applications. Utilizing Passive Infrared (PIR) technology, this sensor detects motion by sensing changes in infrared radiation emitted by humans or warm objects within its field of view.

The HC-SR501 operates on a wide voltage range of 5V to 12V, making it compatible with a variety of development boards and power sources. It provides a digital output signal (HIGH/LOW) that can be easily read by microcontrollers such as Arduino UNO, Raspberry Pi, STM, ARM, AVR, PIC, and 8051.

This module features an adjustable detection range and time delay, allowing users to fine-tune the sensor’s response according to project requirements. With a wide detection angle of approximately 120 degrees and a sensing distance of up to 7 meters, it is suitable for both short- and medium-range motion detection.

The HC-SR501 also supports repeatable and non-repeatable trigger modes, enabling flexibility in how motion events are handled. Common applications include security and alarm systems, automatic lighting, smart home automation, energy-saving systems, robot navigation, and occupancy detection projects.

Easy to use, low power consuming, and highly accurate, the HC-SR501 PIR Motion Sensor is an essential module for students, hobbyists, and professionals building motion-aware electronic systems.