Gravity: mmWave C4001 24GHz Human Presence Detection Sensor I2C & UART

The Gravity C4001 millimeter-wave sensor is a cutting-edge 24GHz radar presence sensor designed for human detection, distance ranging, and speed measurement. Using FMCW (Frequency Modulated Continuous Wave) radar technology, it offers high precision and real-time tracking in a wide range of environments.

It supports both I2C and UART communication, making it compatible with popular platforms like Arduino , Raspberry Pi , ESP32 , and ESP8266 . With its compact form factor, wide detection angle (100°), and superior anti-interference capability, this sensor excels in smart monitoring systems, industrial automation, and environmental sensing.

Key Features

• 24GHz mmWave radar with TOF + Doppler sensing for presence, motion, and velocity detection

• Human presence detection: up to 8 meters

• Motion detection & distance measurement: up to 12 meters

• Speed detection: from 0.1m/s to 10m/s

• FMCW modulation enables high resolution and continuous measurement

• Highly resistant to interference from light, temperature, dust, fog, or noise

• Dual interface: I2C & UART (PH2.0 Gravity standard)

• Compact 22x30mm size, easy to integrate

Advantages Over Infrared Sensors

Unlike traditional infrared sensors, the C4001 can detect both moving and static objects, is unaffected by ambient temperature, and can penetrate non-metallic materials like glass, plastic, or fabric. It is ideal for precise, stable sensing in dynamic environments.

Applications

• Human presence and motion detection

• Distance and velocity measurement

• Smart environmental monitoring

• Industrial automation systems

• Real-time object tracking and security

Specifications

What’s in the Box

• 1x Gravity: mmWave 24GHz Human Presence Detection Sensor (12m, I2C & UART)

• 1x Gravity-4P I2C/UART Sensor Cable

Reference

Product wiki

Dimensional diagram

What is mmWave and the Difference Between 24GHz and 60GHz?