DFRobot
mmWave - C4001 24GHz Human Presence Detection Sensor (25 Meters, UART)
· MPN: SEN0609
C4001 24GHz Millimeter-Wave Presence Sensor (25 m Range) The C4001 Millimeter-Wave Presence Sensor is a high-precision FMCW radar module designed for reliabl...
C4001 24GHz Millimeter-Wave Presence Sensor (25 m Range)
The C4001 Millimeter-Wave Presence Sensor is a high-precision FMCW radar module designed for reliable human presence, motion, and distance detection. Operating at 24 GHz, the C4001 delivers exceptional performance in real-world environments where traditional infrared or ultrasonic sensors often fall short.
With a 100° wide horizontal field of view, 16-meter presence detection, and an extended 25-meter motion and ranging capability, this compact radar module is ideal for security systems, smart home automation, environmental monitoring, and industrial sensing applications.
Engineered with robust anti-interference capabilities, the C4001 performs flawlessly in challenging conditions including dust, fog, low light, temperature fluctuations, and noise. Unlike PIR sensors, it can detect both static and movingtargets, ensuring dependable occupancy detection—even when someone is sitting or sleeping.
Powered by FMCW (Frequency Modulated Continuous Wave) radar technology, the C4001 enables real-time measurement of distance, velocity, and motion direction, offering superior resolution and responsiveness. With UART and I/O interfaces, integration with Arduino, ESPHome, Home Assistant, and industrial systems is straightforward.
Key Features
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Human presence detection up to 16 meters
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Motion and distance detection up to 25 meters
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Velocity detection: 0.1–10 m/s
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Wide 100° × 40° detection beam
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Strong environmental resistance (dust, fog, heat, cold, light)
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FMCW radar for high-accuracy distance and speed measurement
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Supports I/O control and UART communication (9600 baud)
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Compact size (26 × 30 mm), easy to embed
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Works with 3.3 V or 5 V systems
Ideal Applications
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Human presence & occupancy monitoring
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Smart home automation (e.g., lights, HVAC, security)
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Environmental sensing and motion tracking
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Industrial automation & robotics
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Real-time distance and speed measurement
Package Includes
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1 × C4001 24GHz mmWave Presence Sensor (25 m)
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1 × 15-pin header
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- ESPHome
- ESPHome is firmware and a configuration system for ESP-based devices used with Home Assistant. It matters because a supported ESPHome configuration can make the sensor easier to connect to a smart home setup without writing low-level code.
- FMCW
- Frequency-modulated continuous wave is a radar method that sends a changing radio signal and compares the reflection to estimate movement and distance. It matters for presence sensors because it can provide more detailed detection than a simple motion-only sensor.
- mmWave
- Short for millimetre wave, a high-frequency radio technology used here for radar-style sensing. It matters because mmWave sensors can detect very small movements, such as breathing, which helps them notice a person who is sitting still.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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Supplier page — dfrobot.com
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