2PCS RCWL0516 Microwave Doppler Radar Motion Detector Module Board Switch Overview Compact RCWL0516 microwave Doppler radar motion detector modules, supplied as a set of two. Designed for integration into electronics and automation projects, these modules detect motion of moving targets including humans, rats, and cats, and provide a switchstyle output that can be read by microcontrollers and single board computers. Key benefits Reliable motion detection using microwave Doppler technology that is less affected by lighting conditions than optical sensors. Simple integration: switchstyle output suitable for direct input to Arduino and Raspberry Pi projects and other microcontrollers. Twomodule pack provides redundancy or allows deployment in multiple locations without additional purchases. Compact PCB form factor that fits into enclosures and on prototype boards for fast prototyping. What this product does and how it helps Detects movement and produces a digital switching output when motion is present, enabling hands control of lights, alarms, doors, or datalogging systems. Useful for occupancy sensing, pet or pest monitoring, automated triggering, and robotics where detection of moving objects is required. Works reliably in a variety of ambient conditions where optical sensors may fail, such as low light, dust, or glare. Compatibility and interfacing Compatible with Arduino and Raspberry Pi platforms and other microcontroller boards that accept a digital input signal. Provides a switchstyle output that can be read by GPIO pins or fed into relay driver circuits as part of an automation loop. Compact module board format simplifies mounting on breadboards, perfboards, or inside small enclosures. Key attributes Model: RCWL0516 Quantity: 2 pieces Function: Microwave Doppler radar motion detection with digital switch output Form factor: Compact PCB module, suitable for prototyping and small installs Typical uses: Automation switching, motiontriggered alerts, occupancy sensing, pet and pest detection, robotics sensing Example applications Automatic corridor or stairway lighting: Use the module to switch lights on when movement is detected and off after a timeout, improving convenience without manual switches. Pet or pest monitoring: Detect passing animals such as cats or rats in attics, basements, or storage areas and trigger a camera, alarm, or logging routine. DIY robotics and automation: Integrate as a motion cue for mobile robots, automatic doors, or occupancy counters to trigger actions when movement is present. What to know before you These are module boards intended for integration into electronic projects. They require appropriate wiring and a compatible controller or driver to perform final switching or control functions. Basic electronics knowledge is recommended to connect power, ground, and the digital output to your chosen controller or circuit. Contents of the package Two RCWL0516 microwave Doppler radar motion detector module boards This module set provides a compact, projectready motion sensing option for makers, hobbyists, and integrators who need reliable motiontriggered switching compatible with Arduino and Raspberry Pi systems.