Product Introduction

HLK-LD021 is a motion sensing module designed based on an X-band radar chip, with a center frequency of 5.8GHz. This module design adopts fixed frequency, directional transmitting and receiving antennas (1T1R), integrating intermediate frequency demodulation, signal amplification, and digital processing, etc. Function, with the ability to set delay, adjust sensing range, and detect light intensity. This product has the advantages of not penetrating walls, anti-interference, and body advantages include small product size, good suppression of clutter and high-order harmonics, high stability, and consistency. The module initialization time is short, and it also has the backup fast inspection mode is easy to install and test in the lighting fixture, which can effectively accelerate production testing. This module is mainly designed for low-cost applications domain.

This product is suitable for embedded concealed installation and is not affected by temperature/humidity, oil fume, water mist, etc. It can be widely used in various types of lamps,

Such as fluorescent lamps, bulb lamps, tube lamps, ceiling lamps, etc;

Product Charateristic

• Based on the principle of Doppler radar

• This product is positioned as an application in motion perception scenarios

• Sensing distance: hanging height of 4-5m (sensing radius), wall mounted of 10-12 meters (radial)

• Ceiling mounted, 3dB beamwidth: 110 °± 10 °

• Equipped with fast inspection mode

• Capable of photosensitive detection (optional)

Product Application

Smart lighting: home, office, hotel, lighting, pet supplies, etc

Precautions for Testing and Using Radar Modules

• When there are walls or obstacles reflecting microwaves around, there will be gains in perception distance and perception angle; It is relatively spacious around, In this case, there will be attenuation in perceived distance and angle;

• Due to the fact that even small changes can alter the detection of microwave antennas, please protect the antenna and ensure that there are no metal objects on the surface (such as solder wire, etc., to avoid affecting the perception distance;

• Handle with care, avoid intense vibrations, and keep the radar module flat and not deformed; Light sensing devices have no obstruction or coverage, especially lightning

• Avoid opaque obstructions around the photosensitive element D1 on the module;

• The radar module maintains independent usage space, with a free space interval of at least 2mm around the perimeter;

• After power on, there is approximately 7 seconds for initializing noise analysis, during which it is considered abnormal sensing work;

• If there is obstruction on the photosensitive device of the radar module (such as the housing), it is necessary to retest to determine the photosensitive threshold value;

• During production line testing and aging operations, if a large number of radar modules are stacked together when powered on, self excitation may occur elephant, please ensure that a safe distance of at least 50cm is maintained between the powered radar modules.

Precautions for installation of devices with built-in radar modules

• Devices equipped with radar modules should be installed away from ventilation ducts, fire pipes, drainage pipes, mechanical vibrations, or other sources places where large metal equipment and other strongly vibrating objects can affect radar reflection waves and detection perception effects;

• Live working is strictly prohibited to avoid operational errors, misconnections, circuit damage, or electric shock;

• Avoid installation in places exposed to sunlight and rain to prevent damage and affect service life;

• The device must be installed in a place far away from electromagnetic fields to avoid electromagnetic interference and misoperation; It should also be installed away from fixed objects set the place for rotation or swinging (such as electric fans, swaying leaves, drying clothes in the wind, etc.) to avoid any misoperation;

• When installing several components with built-in radar modules, it should be ensured that the distance between each component is ≥ 0.5m;

• The antenna surface of the radar microwave module is recommended to be 3-5mm away from the product casing, otherwise it will affect the perception distance;