Description:
1. HLK-LD2420 is a high-performance 24 GHz radar module with a send-and-receive antenna. Its human body sensing algorithm adopts millimeter-wave radar distance measurement technology and advanced proprietary signal processing technology of S3 series chips to achieve precise perception of movement, micro-movement and standing human body.
2. HLK-LD2420 is mainly used to detect whether there is movement or slight movement of the human body in the indoor scene perception area, and refresh the detect results in real time. It has a maximum sensing distance of 8 m for a moving human body. It can easily configure the sensing distance range, sensing sensitivity in different intervals and refresh time. It supports GPIO and UART interfaces, plug and play, and can be flexibly applied to different smart scenarios and terminal products.

Features:
1. Equipped with single-chip intelligent millimeter wave sensor SoC and intelligent algorithm firmware
2. Ultra-small module size: 20 mm 20 mm
3. Load the default human sensor configuration, plug and play
4. 24 GHz ISM frequency band, certified by FCC, CE, and non-committee spectrum regulations
5. 3.3 V power supply, support 3.0 V ~ 3.6 V wide voltage range
6. Average operating current 50 mA
7. The detect target is moving and micro-moving human body
8. Real-time reporting of detect results
9. Provide visualization tools to support the configuration of detect distance intervals, setting sensitivity and result reporting time between partitions
10. Supports the division of sensing range, completely shielding any interference outside the range
11. Short-range 0.2 m induction, no detect blind zone
12. The longest distance of human motion sensing is 8 m
13. Large detect angle, coverage reaches 60
14. Support various installation methods such as ceiling hanging and wall hanging
15. Independent configuration of trigger and hold state, strong anti-interference ability

Package Include:
Board Only:
1x LD2420 Module Board
Kit:
1x LD2420 Module Board
1x Connection Cable
1x CH340 Serial Board

Application Scenarios:
The HLK-LD2420 human body sensing sensor can detect and identify moving, standing and still people, and is widely used in various AIoT scenarios, covering the following types:

Smart home
Perceive the existence and distance of the human body, and report the detect results for the main control module to intelligently control the operation of home appliances.

Smart business
Identify the approach or distance of the human body within the set distance interval; turn on the screen in time, and keep the device always on when the human body is present.

Smart security
Induction access control, building intercom, electronic peephole, etc.

Smart lighting
Recognize and sense the human body, accurately detect the position, and can be used for lighting equipment in public places (sensing lights, bulb lights, etc.).

Hardware Description: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.