1. Introduction

HLK-LD2402 is a static human life presence sensor from Hailingke, which includes extremely simplified 24GHz sensor hardware and intelligent algorithm firmware for human micro motion sensing.

The hardware is equipped with AIoT millimeter wave sensors, high-performance 24GHz one transmitter one receiver antennas, and peripheral circuits; The human presence sensing algorithm adopts millimeter wave radar distance measurement technology and advanced proprietary radar signal processing technology of radar chips to achieve precise perception of motion, micro motion, and human presence. The firmware of the human presence sensing intelligent algorithm is mainly used in indoor scenes to sense whether there is motion, micro movement, or the presence of a human body in the area, and to refresh the detection results in real time.

The maximum sensing distance of HLK-LD2402 for a moving human body is 10m, and the sensing distance range, triggering and holding thresholds for different intervals, and unmanned reporting time can be easily configured. HLK-LD2402 supports GPIO and UART interfaces, plug and play, and can be flexibly applied to different intelligent scenarios and terminal products. Simultaneously supporting automatic generation of detection thresholds, reducing manual debugging, improving detection accuracy, simplifying installation processes, and facilitating large-scale deployment.

2. Product features and advantages

• Equipped with single-chip intelligent millimeter wave sensor SoC and intelligent algorithm firmware

• Ultra small sensor size: 20mmX20mm

• Load default human body sensing configuration, plug and play

• 24GHz ISM frequency band, can be certified by FCC, CE, and non commission spectrum regulations

• 3.3V and 5V power supply, supporting a wide voltage range of 3.0V~3.6V and 4.5~5.5V

• The average working current is 50mA

• Detecting targets for motion, micro motion, and the presence of a human body

• Real time reporting of detection results

• Provide visualization tools that support configuring detection distance intervals and target disappearance delay times

• Support automatic generation of detection thresholds

• Support the division of sensing range and completely shield any interference outside the interval

• The maximum distance of motion human body sensing is 10m

• Large detection angle, with a coverage range of ± 60 °

• Support multiple installation methods such as hanging on the top and wall

• Trigger and maintain state independent configuration, strong anti-interference ability

3. Application

Smart Home

Sensing the presence and distance of the human body, reporting detection results for the main control module to intelligently control the operation of household appliances.

Smart security and protection

Inductive access control, building intercom, electronic peephole, etc.

Intelligent Business

Identify human proximity or distance within the set distance range; Timely light up the screen and keep the device on while the human body is present

Smart lighting

Identifying and perceiving the human body, precise position detection, can be used for lighting equipment in public places (induction lights, bulb lights, etc.).

4. Specification parameters

HLK-LD2402 is a static human life presence sensor developed based on the Hailingke millimeter wave sensor chip. The sensor adopts FMCW frequency modulation continuous wave, combined with radar signal processing and built-in intelligent human sensing algorithm, to detect human targets in the set space and update the detection results in real time. By using HLK-LD2402, users can quickly develop their own precise human presence sensing products.

The hardware mainly consists of a fully integrated intelligent millimeter wave sensor SoC, a 24GHz transmitter receiver antenna, and a main control MCU;

The software is equipped with intelligent human presence sensing firmware and visual configuration tools to achieve flexible configuration of sensing distance, trigger and hold thresholds, and unmanned reporting time for human body sensing functions.

The specifications of HLK-LD2402 are shown in Table 2-1.