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DFRobot SEN0691 Fermion C4002 mmWave Human Presence Sensor

DFRobot SEN0691 Fermion C4002 mmWave Human Presence Sensor delivers "True Presence" automation with micro-motion detection. Traditional PIR sensors often fail to detect stationary occupants, leading to inconvenient lighting deactivation. The Fermion C4002 mmWave radar module resolves this by using 24GHz FMCW technology to detect micro-motions (such as breathing and chest expansion). Capable of distinguishing between moving, stationary, and micro-moving targets within a 10 × 10 meter range, the DFRobot SEN0691 serves as a reliable core component for smart lighting, HVAC control, and security monitoring in Home Assistant and Internet of Things (IoT) systems.

Features

  • Streamlined home assistant integration
  • True static presence detection (10m x 10m range)
  • Precision control for complex environments
  • Intelligent environmental filtering

Applications

  • Smart lighting automation - maintains lighting based on true presence (breathing/micro-motion) rather than large movements, solving the problem of lights turning off while reading or working
  • HVAC energy management - automatically activates air conditioning or heating only when the room is actually occupied, optimizing energy efficiency in homes or offices
  • Privacy-friendly elderly care - detects presence or prolonged inactivity in bedrooms or bathrooms without the need for invasive cameras or wearable devices
  • Concealed security - capable of detecting intrusion through thin non-metal obstacles (like decorations or thin walls), allowing for a completely hidden security setup

Specifications

  • 3.6V to 5.5V operating voltage
  • Detection capability of motion, micro-motion/stationary human body
  • Max detection distance of motion (11m) and micro-motion/stationary (10m)
  • 120° x 120° detection angle
  • Output interface of OUT (configurable IO) and UART
  • 24GHz to 24.25GHz operating frequency
  • 0 to 50lux light detection
  • -20°C to 85°C operating temperature
  • 22mm x 26mm product dimensions

Kit Contents

  • Fermion C4002 mmWave human presence sensor
  • 5-pin header
Mechanical Drawing - DFRobot SEN0691 Fermion C4002 mmWave Human Presence Sensor

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Veröffentlichungsdatum: 2026-05-04 | Aktualisiert: 2026-05-06