The HC-SR501 PIR motion sensor module is designed to detect human movement within its sensing range. Commonly known as a PIR (Passive Infrared) sensor or pyroelectric sensor, it works by sensing changes in infrared radiation emitted by the human body. The module includes a built-in pyroelectric sensor, signal conditioning circuitry, and a dome-shaped Fresnel lens for improved detection coverage.
It operates on a supply voltage of 4.5V to 20V DC and features a compact, durable design, making it suitable for applications such as security systems, automatic lighting, and DIY motion-detection projects.
The module also includes an adjustable time delay feature, allowing users to control how long the output remains active after motion is detected. It can be easily interfaced with popular platforms like Arduino, Raspberry Pi, AVR, PIC, and 8051 microcontrollers, making it a flexible and reliable choice for embedded systems and IoT applications.
