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, this millimeter wave radar module offers high precision and real-time tracking in a wide range of environments. As a highly sensitive mmWave radar sensor, it ensures reliable presence detection.
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 human presence sensor excels in smart monitoring systems, industrial automation, and environmental sensing. This presence detector is a perfect Arduino radar sensor for developers.
Key Features
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24GHz mmWave radar with TOF + Doppler sensing for presence, motion, and velocity detection
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Human presence detection: up to 8 meters using advanced millimeter wave radar
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Motion detection & distance measurement: up to 12 meters with this mmWave radar sensor
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Speed detection: from 0.1m/s to 10m/s for precise real-time tracking
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FMCW modulation enables high resolution and continuous measurement as a presence detector
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Highly resistant to interference from light, temperature, dust, fog, or noise for the Arduino radar sensor
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Dual interface: I2C & UART (PH2.0 Gravity standard) for any human presence sensor project
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Compact 22x30mm size, easy to integrate mmWave radar sensor into smart devices
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 the ideal human presence sensor for precise, stable sensing in dynamic environments.
Applications
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Human presence and motion detection using millimeter wave radar
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Distance and velocity measurement with an integrated mmWave radar sensor
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Smart environmental monitoring presence detector solutions
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Industrial automation systems featuring Arduino radar sensor technology
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Real-time object tracking and security human presence sensor applications
Specifications
| Category | Specification |
|---|---|
| Operating Voltage | 3.3V / 5V |
| Max Detection Distance | 12m |
| Presence Detection Range | 8m |
| Beam Angle | 100° horizontal / 80° vertical |
| Modulation | FMCW |
| Frequency | 24GHz |
| Baud Rate | 9600 |
| I2C Address | 0x2A / 0x2B |
| Operating Temperature | -40℃ to +85℃ |
| Size | 22mm × 30mm |
What’s in the Box
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1x Gravity: mmWave 24GHz Human Presence Detection Sensor (12m, I2C & UART)
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1x Gravity-4P I2C/UART Sensor Cable
Reference
What is mmWave and the Difference Between 24GHz and 60GHz?