<h3><span ><strong>Does millimeter wave technology have any impact on the health of users?</strong></span></h3>

Name: mmWave - C4001 24GHz Human Presence Detection Sensor for Arduino & ESPHome (25 Meters, UART)
Brand: DFRobot
SKU: SEN0609
Price: 13.9 USD
Availability: InStock

<p><span >Current research and main conclusions show that millimeter wave signals are not harmful to human health. Millimeter wave signals are higher in frequency and lower in energy, so they are less likely to cause harm to the human body. In addition, the radiation power of 5G millimeter wave technology is very low, far below the limit value of international standards, and will not generate heat radiation.</span></p>

C4001 mmWave Sensor: Revolutionizing Human Detection

Introduction

Automated lights that turn off on stationary occupants are a common failure point in smart homes. This is a core limitation of traditional PIR (Passive Infrared) sensors, which are unable to detect a person who is not in motion. The C4001 mmWave Radar Sensor is engineered to solve this problem. It 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.

Detection Range of millimeter-wave human body sensor

mmWave vs. PIR: A Decisive Technological Upgrade

This comparison highlights why mmWave radar is the superior technology for modern smart automation.

mmWave vs. PIR: A Decisive Technological Upgrade

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.

Wiring diagram of the C4001 millimeter-wave human body sensor and Arduino Uno

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.

Top Installation Diagram of c4001 millimeter-wave human body sensor

Top Installation Diagram of millimeter-wave human body sensor

Bottom Installation of millimeter-wave human body sensor

Horizontal Installation of millimeter-wave human body sensor

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.

Applications of mmWave - C4001 24GHz Human Presence Detection Sensor for Arduino & ESPHome