1pcs HCSR501 Adjustable IR Pyroelectric Infrared PIR Motion Sensor Detector Module Key benefits Detects human or animal motion using a pyroelectric infrared sensor for reliable presence sensing. Adjustable sensitivity and time delay let you fine tune detection distance and output duration to match your project needs. Simple digital output and power connections make it easy to integrate with Raspberry Pi kits and common microcontroller boards. Compact, lightweight PCB module fits into small enclosures and prototyping setups without adding bulk. What this module does Senses changes in infrared radiation caused by movement and provides a digital trigger output when motion is detected. Two onboard adjustments allow you to set how far and how long the module responds, so you can avoid false triggers and optimize behavior for each application. Compatibility and interface Designed for use with Raspberry Pi kits and a wide range of microcontroller platforms. Standard supply and signal pins provide a straightforward connection to GPIO or input pins on control boards. Works well in breadboard and prototyping environments as well as in finished projects. Form factor and materials Compact printed circuit board with mounted pyroelectric sensor and electronic components for a durable, purposebuilt detector. Lightweight design suitable for desktop projects, embedded systems, and DIY enclosures. Performance highlights Stable digital motion detection output suitable for triggering alarms, lighting, cameras, or automation routines. Onboard adjustments provide flexible control over detection sensitivity and output timing to reduce nuisance activation. Lowprofile module that consumes minimal power when idle, making it practical for batteryassisted or lowpower designs. Typical applications Home automation: turn lights on only when a person enters a room to save energy and add convenience. Security and monitoring: trigger cameras or alarms when unexpected motion is detected in a monitored area. Robotics and interactive projects: enable robots or displays to react when a person approaches. What you get One HCSR501 adjustable PIR motion sensor detector module, ready for integration into Raspberry Pi kits or other electronic projects. Notes for integration Connect power and the digital output to your control board following standard wiring for sensor modules. Adjust the sensitivity and time delay settings during testing to achieve the desired detection range and response time for your setup. This module provides a straightforward, adjustable motion detection solution for prototyping, automation, and sensing projects that require reliable presence detection and easy integration.