HCSR505 Infrared PIR Motion Sensor Module Overview The HCSR505 is a compact infrared passive infrared motion sensor module designed for reliable human presence detection and automatic switching. Its mini size and simple output make it practical for hobby and professional electronics projects, especially with Arduino and other microcontroller platforms. Key benefits Easy integration: Provides a clean digital output that can be read directly by Arduino and most microcontrollers for fast prototyping and deployment. Reliable presence detection: Uses passive infrared sensing to detect moving human bodies, enabling automatic switching and automation without continuous polling. Space friendly: Miniature module fits into tight enclosures and small devices where larger sensors will not. Low implementation overhead: Simple wiring and straightforward signal make the module suitable for makers and developers who want motion detection without complex setup. Reduces unnecessary power use: Enables motion triggered control of lighting or devices, helping systems run only when people are present. What it does Detects changes in infrared radiation caused by moving human bodies and outputs a digital signal to trigger relays, LEDs, alarms, or microcontroller logic. Acts as a human body sensor switch for automation tasks that require presence detection or motionbased activation. Compatibility and ease of use Ready to work with Arduino boards and compatible microcontroller platforms that accept standard digital inputs. Compact form factor allows mounting inside small housings or on sensor panels. Simple wiring and digital output reduce development time and make the module suitable for both beginners and experienced developers. Attributes Function: Passive infrared (PIR) motion detection and digital switching output. Size: Mini module suitable for constrained spaces and embedded projects. Material: Standard PCB module with infrared sensing element and protective lens. Performance: Designed for stable detection of moving human targets with minimal false triggers when installed correctly. Typical applications Automatic lighting: Turn on closet, hallway, or cabinet lights only when motion is detected. Home automation and energy saving: Trigger scenes or devices in smart home setups to operate based on presence. Security and interactive projects: Serve as a trigger for alarms, cameras, or interactive displays and robots. How to use Connect the module to power, ground, and a digital input on your microcontroller. Read the module output to detect motion events and implement the desired response in your code or control logic. Place the sensor to face the area to be monitored and avoid direct sunlight or heat sources to reduce false positives. The HCSR505 offers a compact, practical solution for adding motion sensing to electronics projects and automation systems while keeping integration simple and reliable.