20 pieces of PIR motion infrared human body sensor modules, each using a pyroelectric infrared detector for reliable motion detection and easy integration with Raspberry devices and common microcontrollers. Why this product helps Fast prototyping and batch projects: 20 identical modules let you outfit multiple devices, build larger systems, or keep spares for testing and development. Detects human motion without contact: the pyroelectric sensor senses changes in infrared radiation from moving people so you can trigger actions automatically. Simple to integrate: designed to interface with Raspberry devices and a wide range of microcontrollers for digital triggering and automation tasks. Key features and attributes Function: Passive infrared motion detection for human presence and movement detection. Compatibility: Works with Raspberry devices and most microcontrollers, suitable for GPIO or digital input use. Form factor: Compact modules built for easy placement on breadboards, prototype boards, and embedded projects. Construction: Sensor element mounted on a small PCB for stable mounting and straightforward wiring. Performance: Reliable motion detection for typical indoor automation, security, and robotics applications. How it solves common problems manual switching: Automatically turn lights on and off based on occupancy to improve convenience. Speed up development: Readytouse modules reduce the time spent sourcing and wiring individual sensor components. Scale easily: A pack of 20 allows consistent behavior across many endpoints in multiroom or multidevice systems. Practical use scenarios Home automation lighting: Connect modules to a microcontroller to switch lights in hallways, closets, or stairwells when motion is detected. Security and monitoring: Use as inexpensive motion triggers for alarm systems, camera activation, or logging systems. Embedded projects and robotics: Add human presence detection to robots, interactive displays, or energy management controllers. Integration tips Place modules where the sensor has a clear line of sight to the monitored area for results. Test placement and orientation to avoid false triggers from heat sources or rapidly changing sunlight. Use consistent wiring and mounting for repeatable performance across multiple modules. What you get Quantity: 20 motion sensor modules ready for prototyping and deployment. Consistent modules for batch projects and multipoint installations. These PIR motion sensor modules provide a practical, loweffort way to add reliable human motion detection to a wide range of Raspberry and microcontroller projects.