HWMS03 Radar Motion Sensor Module 2.4GHz to 5.8GHz Radar and PIR combined motion sensor switch board for Arduino projects What this module does The HWMS03 combines microwave radar detection (2.4 GHz to 5.8 GHz) with passive infrared sensing to detect human body movement and trigger a switch output. It is designed as a compact PCB module that integrates motion detection for use in prototyping and embedded projects. Key benefits Reliable presence detection: Two sensing technologies work together so the module can detect both motion and body heat, reducing missed triggers in varied conditions. Easy Arduino integration: Designed for direct use with Arduino and compatible microcontroller boards for quick prototyping and deployment. Versatile switch output: Provides a clear switch signal suitable for driving relays, LEDs, alarms, or reading by a digital input pin on a controller. Compact and unobtrusive: Small PCB form factor allows mounting inside enclosures and integration into tight project spaces. Important attributes Function: Dualmode motion detection using microwave radar and PIR for human body presence sensing and switch control. Frequency range: Microwave radar operates across 2.4 GHz to 5.8 GHz bands. Compatibility: Intended for Arduino and other microcontroller platforms with digital input capability. Form factor and material: Compact printed circuit board module, populated with standard electronic components ready for wiring into projects. Performance: Combination of radar and PIR improves detection reliability across different lighting and environmental conditions. Typical use scenarios Automatic lighting: Trigger hall, stairway, or closet lighting when human motion is detected to save manual switching and reduce energy use. Security and monitoring: Activate cameras, alarms, or recording systems when presence is detected near doors or sensitive areas. Smart appliances and HVAC control: Detect room occupancy to automate fans, heaters, or ventilation systems for improved comfort and efficiency. Installation and interfacing Simple wiring to a microcontroller digital input or to a relay driver. Check your controller input voltage compatibility before connecting. Designed for prototyping and embedded projects where compact motion sensing is required. The HWMS03 module provides a practical, dualtechnology approach to motion and presence detection for Arduinobased projects and other embedded systems.