Fermion: C4002 mmWave Human Presence Sensor | 10m Static & 11m Motion Radar Detection | Native ESPHome & Home Assistant Support | for Arduino & ESP32 Smart Home DIY

Introduction The C4002 is a 24GHz FMCW technology-based mmWave radar module, specifically designed for applications requiring precise static human presence detection in smart home scenarios. Breaking through the limitations of traditional PIR sensors which only detect significant movement, this module can simultaneously detect moving, stationary, or slightly moving humans within an effective 10×10 meter range. It also supports motion speed detection, motion direction recognition (approaching/leaving), and ambient light detection. Featuring zone detection capability and adjustable detection range, the module intelligently filters environmental interference through background noise collection and offers flexible, configurable output modes. Shipping List C4002 mmWave Motion & Static Presence Module x1 5-pin Header x1

• [NATIVE ESPHOME & HOME ASSISTANT INTEGRATION] Designed for Home Assistant enthusiasts seeking hassle-free setup. This mmWave radar module includes verified ESPHome YAML configuration files. Connect to ESP32 via standard UART, flash the firmware, and instantly access Occupancy, Distance, Energy, and Illuminance entities in Home Assistant—no complex coding or reverse-engineering required.
• [TRUE STATIC PRESENCE UP TO 10M WITH MICRO-MOTION DETECTION] Powered by advanced 24GHz FMCW millimeter wave technology, this sensor detects three types of human presence: Motion (walking/running up to 11m), Static (sitting/standing up to 10m), and Micro-Motion. Solves the common frustration of lights turning off while reading, working, or using the bathroom—delivering genuine "always-on-when-occupied" automation.
• [INTELLIGENT NOISE FILTERING & CONFIGURABLE DETECTION RANGE] Built-in adaptive background noise learning algorithm automatically filters non-human interference such as ceiling fans, swaying curtains, or moving plants. Software-configurable distance gates enable boundary definition to prevent wall-penetration false triggers—ensuring the sensor only monitors the intended room without detecting activity in adjacent spaces.
• [INTEGRATED LIGHT SENSOR (0-50 LUX) FOR ADVANCED AUTOMATION] Combines human presence detection and ambient light measurement (0-50 lux) in a single compact module. Eliminates the need for extra light sensors or complex wiring. Enables sophisticated condition-based automations in Home Assistant, such as "Turn on lights only when presence is detected AND ambient light is below 15 lux"—maximizing energy efficiency.
• [WIDE COMPATIBILITY & COMPREHENSIVE OFFICIAL DOCUMENTATION] Operates on 3.6V-5.5V power supply (compatible with both 3.3V and 5V logic systems without level shifters). Works seamlessly with Arduino, Raspberry Pi and ESP32 via standard UART interface. Includes comprehensive official Wikis, ESPHome setup guides, Home Assistant tutorials, sensor data parsing examples, and automatic environment calibration instructions for rapid deployment in DIY smart home projects.