HCSR501 blue motion sensor module designed for reliable passive infrared detection and easy integration into electronics projects Key benefits Detects human or warm object movement to trigger lights, alarms, or automation reliably Compact blue PCB makes installation simple in enclosures or prototype boards Onboard adjustments allow tuning of sensitivity and output hold time for different environments Low power operation and a clear digital output simplify connection to controllers and standalone circuits What it does and how it helps Function: Passive infrared motion sensing that produces a digital signal when movement is detected. Use this signal to wake devices, activate lighting, or trigger recording and notifications. Problem solving: Replaces manual switching and reduces wasted power by activating systems only when needed. Adjustable settings let you avoid false triggers from pets or distant motion. Standout qualities: Widely compatible output and a compact form factor that fits into hobby and professional applications without major changes to existing hardware. Compatibility and connections Designed for easy connection to common microcontroller platforms and control circuits. Typical use cases include Arduino and Raspberry Pi projects, home automation controllers, security panels, and standalone relay drivers. Clear signal output is suitable for digital input pins or for driving intermediate circuitry. Supply and wiring are straightforward for rapid prototyping. Size, material, and performance notes Compact blue PCB layout suitable for tight spaces. Mounting holes or simple adhesives can secure the module depending on the installation. Typical PIR performance for indoor detection of human movement. Onboard trim adjustments permit tailoring of detection range and output duration to match installation requirements. Durable electronic components suitable for hobbyist and light industrial use when installed within an appropriate enclosure. Practical applications Motionactivated lighting: Install the module near entrances, hallways, or closets to switch lights on only when a person is present. Security and monitoring: Use the sensor to wake cameras or trigger alarms when unexpected movement is detected in a monitored zone. Energy saving automation: Connect the module to HVAC or appliance control logic to reduce energy use by running systems only when occupants are present. What you get A blue HCSR501 motion sensor module ready for integration into electronics projects and automation systems. Simple wiring and adjustable controls help you adapt the module to varied environments without complex configuration.