The DFROBOT mmWave C4001 sensor employs 24GHz millimeter-wave technology to detect human presence with high precision and reliability. Unlike traditional infrared or ultrasonic sensors, this module is not affected by environmental factors such as temperature, humidity, or ambient light, making it suitable for indoor and outdoor applications where stable occupancy detection is required. The sensor integrates a UART interface for straightforward communication with microcontrollers and single-board computers, simplifying integration into automation systems. Its detection range extends up to 25 meters, allowing coverage of large areas such as rooms, hallways, or open spaces. The hardware is built with a compact, durable enclosure that protects the internal circuitry from dust and minor impacts. The manufacturing process emphasizes consistent quality control, ensuring each unit meets performance standards for sensitivity and false-alarm suppression. The sensor operates efficiently with low power consumption, suitable for battery-powered or energy-conscious installations. It provides real-time output indicating whether a person is present or absent, with configurable parameters via UART commands. The robust design and reliable firmware contribute to stable long-term operation in both residential and commercial settings. This model represents a cost-effective solution for advanced presence detection without the complexity of camera-based systems. The construction uses high-quality materials for the PCB and antenna substrate, contributing to signal integrity and consistent detection performance. The outer shell is made from impact-resistant plastic with a matte finish that resists scratches and reduces glare. The connectors are gold-plated for corrosion resistance and stable electrical contact. During manufacturing, each unit undergoes calibration to ensure the detection angle and range meet specifications. The firmware is designed to filter out static objects and moving clutter, focusing on human presence indicators such as micro-movements and breathing patterns. The sensor can be mounted on walls or ceilings, and its detection area can be adjusted via configuration parameters to avoid unwanted triggers. The UART interface operates at standard baud rates and outputs data in a simple ASCII format, making it compatible with popular platforms like Arduino, Raspberry Pi, and ESP32. The sensor’s response time is fast, typically within a few seconds, providing timely status updates for lighting control, security systems, or HVAC automation. The design also includes an onboard LED indicator for visual feedback during setup and debugging.

This sensor offers dependable performance in a compact form factor, with a focus on ease of integration and long-term reliability. The mmWave technology used in the C4001 is inherently immune to false triggers caused by pets, moving curtains, or hot air currents, which often plague passive infrared sensors. This makes it especially valuable in environments where reliable human detection is critical, such as smart offices, elderly monitoring, or automated energy saving. The sensor can distinguish between stationary and moving individuals, providing more nuanced data for advanced logic. The detection zone can be narrowed or expanded through configuration, allowing customization for specific room layouts. The sensor operates in the 24GHz ISM band and complies with relevant emission standards, ensuring safe coexistence with other wireless devices. The power supply range is generous, accommodating 3.3V or 5V inputs, and the current draw remains low during active sensing. The product is backed by DFROBOT’s reputation for quality components and reliable support documentation.