HCSR501 Infrared PIR Motion Sensor Module for Arduino and Raspberry Pi Quick overview A compact passive infrared motion sensor module that detects human movement and provides a reliable digital output for microcontroller projects. Designed for easy integration with development boards, the module offers adjustable sensitivity and delay settings to suit a wide range of applications. Key benefits Reliable motion detection: Detects changes in infrared radiation caused by moving people or animals, enabling responsive automation and security functions. Easy integration: Standard digital output interfaces directly with Arduino and Raspberry Pi general purpose input pins for fast prototyping and deployment. Tunable behavior: Onboard adjustments let you set detection range and output hold time so the sensor matches your application needs without extra components. Low power and fast response: Suitable for batterypowered projects and realtime triggers, helping conserve energy while maintaining prompt detection. Compact and durable: Small footprint and standard PCB construction with a plastic Fresnel lens make the module easy to mount and position in enclosures or on panels. Important attributes Function: Passive infrared (PIR) motion sensing with digital trigger output for motion present or not present. Compatibility: Works with Arduino, Raspberry Pi, and most microcontrollers that accept a digital input. Size and form factor: Compact PCB module suitable for tight spaces and panel mounting. Material and build: Standard PCB circuitry with a molded plastic Fresnel lens for focused infrared sensing. Performance features: Adjustable sensitivity and time delay, stable operation in typical indoor and sheltered outdoor environments, and low standby current. Typical applications Automated lighting control: Turn lights on only when motion is detected to save energy in hallways, closets, and workspaces. Security and alarm systems: Use as a trigger for cameras, alarms, or notification systems to monitor entry points and activity. Interactive projects and robotics: Detect human presence for user interaction, object avoidance, or behavior triggering in DIY robotics and makerspace projects. What you get A readytouse HCSR501 PIR motion sensor module that connects directly to development boards. Simple wiring and clear adjustment controls let you tune detection range and delay for reliable, repeatable operation. Compatibility note Designed for easy connection to Arduino and Raspberry Pi boards and many other microcontroller platforms using standard digital input pins.