DF Robot 24GHz Human Presence Sensor

The Gravity: C4001 millimeter-wave presence sensor, operating at a wavelength signal of 24GHz, boasts a horizontal detection range of 100°, a presence detection range of 8 meters, and a motion detection and ranging range of 12 meters. It utilizes the Gravity interface (PH2.0) and supports I2C and UART communication methods, compatible with Arduino, Raspberry Pi, ESP32 / ESP8266 development boards. Perfect for human presence detection, environmental monitoring, and real-time monitoring projects.

Human detection
Compared to other types of human presence sensors, such as infrared sensors, the C4001 (12m) millimeter wave presence sensor has the advantage of detecting 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 moving, the sensor can quickly and sensitively detect their presence.

Distance and velocity detection
The C4001 (12m) millimeter wave presence sensor utilizes FMCW modulation for distance and speed measurement. It has a maximum detection range of 12 meters and a speed measurement range of 0.1 to 10 meters per second.

FMCW (Frequency Modulated Continuous Wave) is a type of radar system based on frequency modulation of continuous wave signals. 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, speed, and angle can be achieved.

Compared to traditional pulse radar technology, FMCW radar can continuously measure the distance of an object. By utilizing the Doppler effect, it can also obtain information about the velocity of the target object. This makes FMCW radar suitable for applications that require tracking the movement of objects. Additionally, FMCW radar can achieve continuous frequency scanning, providing higher measurement resolution. Since it does not require waiting for the return of echo signals, FMCW radar is suitable for applications that require real-time monitoring and tracking of target objects.

Quick Spec

• Operating Voltage: 3.3V/5V
• Maximum Detection Range: 12m
• Beam Angle: 100 x 80°
• Modulation Mode: FMCW
• Operating Frequency: 24GHz
• Operating Temperature: -40 ~ +85℃
• Baud Rate: 9600
• I2C Address: 0x2A / 0x2B
• Dimensions: 22 x 30mm

Wiring Diagram

Resources

• Product Page
• Product Wiki
• DFRobot_C4001 library

Shipping List

• 1 x DF Robot 24GHz Human Presence Sensor
• 1 x Gravity Interface Cable