1. Introduction

HLK-LD2401 is a highly sensitive 24GHz human presence state sensing module developed by Hi-link Electronics. Its working principle is to use FMCW frequency modulation continuous wave to detect human targets in a set space, combined with radar signal processing and precise human sensing algorithms, to achieve high-sensitivity human presence state sensing, recognize human bodies in motion and stationary states, and calculate auxiliary information such as target distance.

This product is mainly used in indoor scenes to sense whether there is movement or micro movement of the human body in the sensing area, and to output real-time detection results. The maximum sensing distance can reach 6 meters, and the distance resolution can be configured as 0.75m or 0.2m. Provide a visual configuration tool that can easily configure the sensing distance range, sensing sensitivity in different intervals, and unmanned delay time to meet specific application needs.

Supports GPIO and UART output, plug and play, and can be flexibly applied to different intelligent scenarios and terminal products.

2. Product features and advantages

2.1 Product features

• The farthest sensing distance can reach up to 6 meters

• Configurable distance resolution (0.2m or 0.75m per distance gate, up to 8 distance gates)

• Large detection angle, coverage range up to ± 60 degrees

• Accurate identification within the interval, supporting the division of sensing range, and shielding interference outside the interval

• Multi level intelligent parameter tuning can be achieved through Bluetooth or serial port to meet the needs of changing scenarios

• Visual debugging and configuration tools

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

• 24GHz ISM frequency band, certified by FCC and CE spectrum regulations

• The ultimate cost-effective choice

• Supports multiple packaging options, including pin and patch packaging

2.2 Product advantages

The HLK-LD2401 human body sensing module adopts 24GHz millimeter wave radar sensor technology. Compared with other solutions, it can effectively detect human body movements

There are obvious advantages in sensing applications:

1. In addition to being sensitive to human motion, it can also sensitively sense stationary, micro motion, and sitting/lying human bodies that cannot be recognized by traditional methods;

2. Has good environmental adaptability, and the sensing effect is not affected by surrounding environmental factors such as temperature, brightness, humidity, and light fluctuations;

3. It has good shell penetration and can work hidden inside the shell, without the need to open holes on the surface of the product, which improves the product's aesthetics;

4. It can flexibly configure the farthest sensing distance and the sensitivity on each distance door, achieving flexible and precise personalized configuration;

5. Equipped with Bluetooth function, radar parameters can be debugged directly using the APP without the need to connect a serial port

3. Application

The HLK-LD2401 human body sensing module can detect and recognize movements, micro movements, standing, sitting, and lying human bodies. It supports multi-level parameter tuning and can be widely used in various AIoT scenarios. The commonly used types are as follows:

Human body induction light control

Sensing the presence of people in the space and automatically controlling lighting, such as public lighting equipment, various induction lights, bubble lights, etc.

Human body induction wake-up of advertising screens and other devices

Automatic activation by human intervention, automatic sleep mode without human intervention to save energy, and more precise and efficient information delivery.

Life safety protection

UV lamp work protection to prevent personal injury caused by turning on the UV lamp when there are people around.

Automatic detection and alarm of hazardous areas to prevent people from entering specific high-risk spaces, such as high-risk areas entered by personnel involved in coal mine blasting.

Smart home appliances

If there is no one in the room for a long time, the TV, air conditioning and other appliances will automatically turn off, which is energy-saving and safe.

Intelligent security and protection

Detection and identification of intrusion, stay, etc. within a designated area.