DFROBOT mmWave Radar – Human Presence Detection Sensor (9 Meters)

Price: $34.00
(as of Dec 25, 2025 10:02:19 UTC – Details)

Product description

DFROBOT mmWave – C4001 24GHz Human Presence Detection Sensor (25 Meters, UART)

The C4001 millimeter-wave presence sensor utilizes a wavelength signal of 24GHz. It has a detection range of 100° horizontally, with a presence detection range of 16 meters and a motion detection and distance measurement range of 25 meters. It is suitable for human presence detection, environmental monitoring, and real-time monitoring projects.

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.

The differences between millimeter-wave presence sensor and infrared sensor

Distance and Velocity detection

Detection Range of millimeter-wave human body sensor

The C4001 (25m) millimeter-wave presence sensor utilizes Frequency Modulated Continuous Wave (FMCW) modulation for distance and speed measurement. It has a maximum measurement range of 25 meters for distance and a speed measurement range of 0.1 to 10 meters per second.FMCW is a radar system based on Frequency Modulated Continuous Wave. Unlike traditional pulse radar, FMCW radar continuously emits a series of continuous wave signals with gradually changing frequencies while simultaneously receiving the reflected signals. By analyzing the received signals, measurements of parameters such as distance, velocity, and angle can be achieved.Compared to traditional pulse radar technology, FMCW radar can continuously measure the distance of objects. By utilizing the Doppler effect, it can also obtain velocity information of the target objects. This makes it suitable for applications that require monitoring the motion status of target objects. Additionally, FMCW radar can achieve continuous frequency scanning, providing higher measurement resolution. Since it doesn’t need to wait for the echo signal to return, it is suitable for applications that require real-time monitoring and tracking of target objects.

Dimensional Drawing

Size: 26*30mm

APPLICATIONS

Human DetectionDistance and Velocity DetectionEnvironmental MonitoringIndustrial AutomationReal-time Monitoring and Tracking SHIPPING LIST

C4001 mmWave Presence Sensor 25m× 15-pin header

FEATURES Human detection: Detection range up to 16 meters and motion detection range up to 25 meters. Distance detection: Range from 1.2 meters to 25 meters. Velocity detection: Range from 0.1 meters per second to 10 meters per second. Strong anti-interference capability, unaffected by snow, haze, temperature, humidity, noise, etc. High and low-level output control through I/O ports. Input and output control via serial port. Small size, easy to integrate.

Wiring diagram

Wiring diagram of mmWave – C4001 24GHz Human Presence Detection Sensor and DFRduino UNO R3

Installation Method

Top Installation Diagram of mmWave – C4001 24GHz Human Presence Detection Sensor (25 Meters, UART)

Bottom Installation of mmWave – C4001 24GHz Human Presence Detection Sensor (25 Meters, UART)

SPECIFICATION

Operating voltage 3.3/5V Maximum detection range 25m Beam angle 100*40° Modulation mode FMCW Operating frequency 24GHz Operating temperature -40~85℃ Baud rate 9600 Size 26*30mm

【24GHz High Precision Stillness and Motion Detection】: With the Doppler radar technology and 24GHz working frequency, combined with FMCW and CW multi-mode modulation, this mmWave Radar sensor can accurately detect all movements, micro-movements, and extremely weak movements within a 9-meter range. Whether it’s subtle human movements or stillness and sleep states, this sensor can accurately perceive them.
【Compact Size, Easy to Integrate】: The mmwave sensor’s size is only 24*28mm, and it uses a 1Tx1Rx antenna structure, which is very suitable for integration into various systems or mobile devices, providing great convenience for various projects.
【Strong Anti-interference Ability (From -40 to 85℃)】: This mmwave presence sensor has outstanding anti-interference ability and can work stably in an environment of -40~85℃. Whether it’s snow, fog, haze, temperature, humidity, dust, light, or noise, none of these can affect its working efficiency, ensuring stable performance in any environment.
【Wide Range of Application Scenarios】: Due to its high precision and strong anti-interference ability, this presence sensor is widely used in collision warning for autonomous driving cars, human activity monitoring in smart homes, precise control in industrial automation, non-contact monitoring in healthcare, inventory management in retail and logistics, obstacle avoidance and positioning in drones.
【High Flexibility with Various Output Options】: This human presence sensor provides two types of sensing result output methods. You can choose to output through the serial port or through the I/O port, which is very flexible and easy to expand. At the same time, it provides various available example codes that can meet the needs of makers in different projects.