mmWave Radar - 24GHz Human Presence Detection Sensor (9 Meters)

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What is a mmWave radar sensor?

Millimeter-wave radar technology is a contactless sensing technology for detecting objects and providing the range, velocity and angle of those objects (in our case humans). mmWave sensors transmit signals with a wavelength in the high frequency spectrum between 24GHz and 300GHz, also called the millimeter (mm) range.

Accurate Stillness and Motion Detection

Compared to other human presence sensors like PIR sensors, infrared sensors, and ultrasonic sensors, mmWave sensors offer the ability to sensitively detect both activity and stillness. They also possess robust anti-interference capabilities, making them less susceptible to factors such as temperature changes, variations in ambient light, and environmental noise. The sensor can swiftly and sensitively detect the presence of a person, whether they are sitting, sleeping, or in motion.

For example, in the context of a public smart restroom project, mmWave human presence sensors prove invaluable due to the complex and noisy environment typically found in such facilities. Despite these challenges, mmWave sensors can accurately and instantly monitor the occupancy status of restroom stalls. This optimization of layout and resource allocation in public restrooms enhances efficiency and improves the user experience.

mmWave Radar - Human Presence Detection (9m)-Horizontal installation

Horizontal installation

mmWave Radar - Human Presence Detection (9m)-Top installation

Top installation

Exceptional Sensitivity

By utilizing millimeter-wave technology, these sensors employ high-frequency electromagnetic waves that propagate at speeds comparable to light in the air. As a result, they are widely regarded for their remarkable accuracy and sensitivity. The sensors are highly effective in various domains, such as smart homes and item tracking, enabling precise determination of an object's position within the environment. They can also penetrate certain objects, such as bed boards and clothing, enabling the detection of human presence or objects beyond physical barriers.

Small Size and Easy Integration

With dimensions of 24*28mm, approximately the size of a 25-cent coin, mmWave human presence sensors boast a compact form factor that facilitates ease of use and seamless integration. Their small size, coupled with a square design, allows for effortless embedding into various devices and systems. This enables the sensors to be widely employed in applications with space constraints or a need for compact designs without compromising performance or functionality.

For instance, mmWave human presence sensors can be integrated into fitness trackers or smartwatches. By detecting the body's movements and posture, the sensors can provide accurate fitness data such as step count, distance traveled, and calorie consumption. These insights assist users in gaining a deeper understanding of their physical activity, enabling them to set and track fitness goals effectively.

Human Presence Detection Sensor‘s small size

Extensive Application

Moreover, these sensors can be interconnected with other sensors, such as light sensors and temperature sensors, facilitating applications in smart home settings for lighting and air conditioning control. Their versatile integration capabilities are also conducive to a wide range of applications, including robotics projects and logistics tracking, among others.

smart home


  • Human presence detection : Both Stillness and Motion Detection
  • Strong anti-interference ability, not to be affected by snow, haze, temperature, humidity, dust, light, noise, etc.
  • Small Size and Easy Integration
  • I/O port switch quantity input and output control
  • Serial port input and output control
  • Specification

  • Power Supply: 3.6~5V
  • Operating Current: 90mA
  • Detection Distance: 9m
  • Equivalent Transmit Power: 9-12dBM
  • Beam Angle: 100*40°
  • Modulation Mode: FMCW, CW
  • Operating Frequency: 24GHz
  • Operating Temperature Range: -40~85℃
  • Baud Rate: 115200
  • Dimension: 24*28mm/0.94*1.10"
  • Documents

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  • mmWave - Human Presence Detection Sensor (9 Meters) ×1

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    mmWave Radar - 24GHz Human Presence Detection Sensor (9 Meters)

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