1. Product introduction

HLK-LD2420 is a high performance 24 GHz radar module with one transmitter and one receiver antenna. Its human sensing algorithm uses millimeter wave radar distance measurement technology and the advanced proprietary signal processing technology of S3 series chips to achieve accurate sensing of moving, micro-movement and standing human bodies.

HLK-LD2420 is mainly used in indoor scenes to sense whether there is a moving or slightly moving human body in the area and refresh the detection results in real time. It has a maximum sensing distance of 8m and can be easily configured to sense the distance range, sensitivity and refresh time in different zones. It supports GPIO and UART interface, which is plug-and-play and can be flexibly applied to different smart scenarios and end products.
 

2. Product Features and Application Scenarios

2.1 Features

• Single-chip smart millimeter wave sensor SoC and smart algorithm firmware on board

• Ultra-small module size: 20 mm × 20 mm

• Load default body sensor configuration, plug and play

• 24 GHz ISM band with FCC, CE, and Commission-free spectrum regulatory approvals

• 3.3 V power supply, supports 3.0 V ~ 3.6 V wide voltage range

• Average operating current 50 mA

• Detection target for motion, micro-motion human body

• Real-time reporting of detection results

• Provide visualization tools to support the configuration of the detection distance
  interval, sub-interval setting sensitivity and results reporting time

• Support induction range division, completely shielding any interference outside the zone

• Proximity 0.2 m sensing, no blind detection zone

• Motion body sensing distance up to 8 m

• Large detection angle, covering a range of ±60°

• Support a variety of installation methods, such as hanging the top, hanging wall

• Independent configuration of trigger and hold states, strong anti-interference capability

2.2 Application Scenarios

HLK-LD2420 human body sensing sensor can detect and identify moving, standing and stationary human bodies, and is widely used in various AIoT scenarios, covering the following types.

• Smart Home

It senses the presence and distance of the human body and reports the detection results for intelligent control of home appliances by the main control module.

• Smart Business

Recognizes the human body approaching or moving away within the set distance interval; lights up the screen in time to keep the device on in the presence of the human body.

• Smart Security

Induction access control, building intercom, electronic cat's eye, etc.

• Smart Lighting

Identify and sense human body, precise position detection, can be used in public place lighting equipment (sensor lamp, bulb lamp, etc.).

3. System Description

HLK-LD2420 is an intelligent and accurate human sensor based on Hi-link S3 series millimeter wave sensor chip. The sensor uses FMCW FM continuous wave, combined with radar signal processing and built-in intelligent human sensing algorithm to detect human targets in a set space and update the detection results in real time. Using Haling Technology's intelligent millimeter wave sensor reference solution, users can quickly develop their own accurate body sensing products.

The hardware part of HLK-LD2420 is composed of a fully integrated Hi-link Smart Millimeter Sensor SoC, a 24 GHz transmitter-receiver antenna and a host MCU; the software part is equipped with firmware and visual configuration tools released by Hi-link to realize human body sensing functions with flexible configuration of sensing distance, sensitivity and reporting time.

4. Hardware Description

4.1 Features HLK-LD2410(BLE)

The picture below shows the front and back of the module. The module is equipped with 5 pin holes (factory does not come with pins) called J2 for power supply and communication; J1 is the SWD J1 is the SWD interface, which is used for MCU program burning and debugging.

5. Software Description

This chapter introduces the firmware debugging of HLK-LD2420 and the use of the upper computer tools.

The HLK-LD2420 is shipped with burned-in system firmware, the firmware version is detailed in the module package. Hailing Technology provides visualization and configuration software for HLK-LD2420 hardware, which is convenient for developers to configure HLK-LD2420 parameters according to the usage scenarios and optimize the sensing effect.

 

6. Firmware Configuration

This section describes how to debug the HLK-LD2420 radar module firmware.

Step 1  The USB to TTL serial adapter board is used to connect the host computer to the radar module, and the pin connections are shown in Table 4-1 and Figure 4-1. shown in Table 4-1 and Figure 4-1.

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On Jan 14, 2024 at 19:14:31 PST, seller added the following information: