mmWave C4001 24GHz Human Presence Detection Sensor for Arduino & ESPHome 25 Meters, UART

The C4001 mmWave Radar Sensor detects human presence based on subtle life signs, providing accurate detection of occupants whether they are in motion or completely still. This technology ends the need for constant movement to keep lights on, enabling a truly seamless and intelligent automation experience.

True Presence Detection: Accurately senses people who
are sitting, lying down, or even sleeping.

High Environmental Immunity: Unaffected by
temperature, humidity, dust, light, or noise.

Long-Range Sensing: Covers large areas with up to a
25-meter motion detection range.

Effortless Integration: Designed for compatibility
with Arduino, ESPHome, Home Assistant, and other popular DIY
platforms.

Simplified & Straightforward Integration

The C4001 24GHz mmWave sensor is designed for easy implementation. With a simple wiring setup, the C4001 can be operational within a project in a short amount of time.

How It Works: The FMCW Advantage

The C4001's precision is derived from its Frequency-Modulated Continuous Wave (FMCW) radar technology. It continuously
emits a signal and analyzes frequency shifts in the return wave. This method allows it to determine an object's distance and, through the Doppler effect, detect microscopic movements—such as breathing—which is the key to its unparalleled static presence detection capability.

Flexible Installation Options

For optimal performance, the installation method should be chosen to suit the intended application. Top-down installation is ideal for room-wide coverage, while tilted or horizontal installation is better for directional sensing in specific zones.

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, dust, light, noise, etc.
• High and low-level output control through I/O ports.
• Input and output control via serial port.
• Small size, easy to integrate.

Applications

• Smart Bathroom: Ensures lights and exhaust fans remain active as long as the space is occupied, then shut off automatically when vacant. This provides a hands-free, convenient, and energy-efficient solution.
• Advanced Security Monitoring: Unlike motion detectors prone to false alarms from environmental factors, the C4001 detects actual human presence. This allows for security systems that provide more meaningful alerts when individuals linger in a protected area.
• Intelligent Energy Management: In offices or living spaces, the C4001 24GHz mmWave sensor enables precise occupancy-based control of HVAC, air purifiers, and lighting systems. Equipment runs only when rooms are occupied, maximizing energy savings.

Specification

• Operating Voltage: 3.3V / 5V
• Communication: I/O, UART
• Default Baud Rate: 9600
• Operating Temperature: -40℃ to 85℃
• Dimensions: 26mm x 30mm