DFRobot C4001 Millimeter-Wave Presence Sensor is a high-performance 24GHz radar module that enables non-contact detection of both motion and stillness within a broad range. With a presence detection range of up to 16 meters and a motion/distance detection range of up to 25 meters, it’s ideal for environmental monitoring, smart automation, and real-time tracking applications.
Human detection
Compared to other types of presence sensors such as infrared sensors and ultrasonic sensors, the C4001(25m) millimeter-wave presence sensor has the advantage of being able to detect both static and moving objects. It also has a relatively strong anti-interference ability, making it less susceptible to factors such as temperature changes, variations in ambient light, and environmental noise. Whether a person is sitting, sleeping, or in motion, the sensor can quickly and sensitively detect their presence.
Distance and velocity detection
The C4001 millimeter-wave presence sensor features a 25-meter measurement range and employs Frequency Modulated Continuous Wave (FMCW) for determining distance and speed. Its speed measurement capability ranges from 0.1 to 10 meters per second.
FMCW is a radar technique that operates on a continuous wave basis. Unlike conventional pulse radar, FMCW radar continuously emits wave signals with varying frequencies while receiving reflected signals simultaneously. By processing these received signals, it can measure distance, velocity, and angle.
FMCW radar offers continuous distance measurements unlike traditional pulse systems. It leverages the Doppler effect to gather speed information on moving targets, making it ideal for applications necessary for monitoring object motion. The technology facilitates continuous frequency scanning, enhancing measurement accuracy. As it doesn't require waiting for an echo signal, FMCW radar is well-suited for real-time tracking and monitoring applications. Compared to traditional pulse radar or infrared sensors, FMCW radar provides continuous, real-time tracking and is more immune to environmental noise.
What is a millimeter-wave radar sensor?
Millimeter-wave radar technology is a non-contact sensing technology used to detect objects and provide information about their distance, velocity, and angle (in the case of humans, for example). The signals emitted by millimeter-wave sensors fall within the high-frequency spectrum with wavelengths between 24GHz and 300 GHz, also known as the millimeter (mm) range.
Installation Method
The millimeter-wave human body sensor is sensitive to the installation method, and improper installation can affect the performance and functionality of the sensor. The commonly used installation methods for this module include top installation, bottom installation, horizontal installation, and downward tilted installation.
Top Installation Diagram of millimeter-wave human body sensor
Bottom Installation of millimeter-wave human body sensor
Horizontal Installation of millimeter-wave human body sensor
Wiring diagram of millimeter-wave human body sensor and Arduino Uno
Key Features
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Human Presence Detection: Detects static and moving humans up to 16 meters
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Motion & Distance Measurement: Detects objects up to 25 meters
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Velocity Detection: Detects motion speeds from 0.1 to 10 m/s
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24GHz FMCW radar technology for high-resolution, real-time sensing
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Strong anti-interference: Unaffected by temperature, light, dust, noise, or humidity
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Supports I/O level output and UART communication
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Compact form factor: Easy to integrate into smart systems
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Multiple installation methods: Top, bottom, horizontal, or angled
Applications
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Smart human presence detection
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Distance and motion tracking systems
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Environmental monitoring solutions
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Industrial automation
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Security and surveillance systems
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Smart lighting and HVAC control
Specifications
| Category | Specification |
|---|---|
| Operating Voltage | 3.3V / 5V |
| Detection Range (Human Presence) | Up to 16 meters |
| Detection Range (Motion/Distance) | 1.2 – 25 meters |
| Velocity Detection Range | 0.1 – 10 m/s |
| Modulation Mode | FMCW |
| Beam Angle | 100° (horizontal) × 40° (vertical) |
| Operating Frequency | 24GHz |
| Communication Interface | UART (Baud rate: 9600), I/O control |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 26 × 30 mm |
Package Includes
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1 × C4001 24GHz Millimeter-Wave Presence Sensor (25m)
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5-pin header
Documents