What is HLK-LD2410B and how to use it?
What is HLK-LD2410B?
The HLK-LD2410B is a 24 GHz millimeter-wave radar sensor module specifically engineered for the detection of human presence and motion. It utilizes Frequency Modulated Continuous Wave (FMCW) radar technology, which allows for precise identification of both stationary and moving human bodies. Notably, this module is capable of detecting micro-movements, such as a person sitting or lying down, a functionality that traditional sensors, including infrared and ultrasonic devices, typically lack.
This sensor is designed for use in indoor environments and is capable of detecting human presence within a range of up to 5 meters. With compact dimensions of 7mm x 35mm, it is suitable for integration into various devices and applications. The module supports both Bluetooth and UART communication protocols, enabling users to configure and adjust the sensor through mobile applications or personal computers.
Key Features of HLK-LD2410B:
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Detection Range: The module can detect human presence at distances up to 5 meters, with a resolution of 0.75 meters, ensuring high precision.
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Wide Detection Angle: The sensor covers a ±60° detection angle, allowing it to monitor a broad area.
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Micro-Motion Detection: In addition to detecting moving human bodies, the module can detect static and micro-movements, such as sitting or lying down.
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Adjustable Sensitivity: Users can adjust the sensitivity to fine-tune detection parameters based on specific needs.
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Bluetooth & UART Communication: The sensor supports Bluetooth and UART interfaces, enabling flexible configuration via mobile apps or direct device integration.
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Strong Environmental Adaptability: The sensor operates effectively under various environmental conditions, unaffected by factors like temperature, humidity, and light.
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Compact Design: The module is very small (7mm x 35mm), making it easy to integrate into various devices such as smart home systems or security devices.
Product Advantages:
The LD2410B human presence sensing module uses 24GHz millimeter-wave radar technology, offering significant advantages in human detection applications compared to other solutions:
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Enhanced Sensitivity: In addition to its capacity to detect moving human bodies, the system is also capable of identifying static subjects, micro-movements, and individuals who are sitting or lying down—qualities that traditional solutions typically fail to recognize.
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Excellent Environmental Adaptability: In contrast to infrared or ultrasonic sensors, the LD2410B remains unaffected by environmental variables such as temperature, brightness, humidity, and light fluctuations. This characteristic guarantees stable performance across diverse conditions.
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Good Shell Penetration: The sensor can be concealed within a protective casing without compromising its functionality. This design approach eliminates the necessity for surface perforations on the product, thereby enhancing its aesthetic appeal and mitigating the risk of electromagnetic interference or structural complications.
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Flexible Configuration of Detection Range and Sensitivity: Users have the capability to configure the maximum detection range and sensitivity for each distance gate with a high degree of flexibility, facilitating a tailored and personalized experience.
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Bluetooth Functionality: The module is equipped with Bluetooth functionality, enabling users to configure radar parameters directly through an application, thereby eliminating the need for a serial port connection. This advancement significantly streamlines the setup process.
How to Use HLK-LD2410B:
To use the HLK-LD2410B sensor effectively, follow these steps:
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Connect the Sensor:
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The module has 5 pins, with the following functions:
| Pin | Symbol | Name | Function |
| 1 | OUT | Target Status Output | High when human presence is detected, low when no human is detected |
| 2 | UART_Tx | UART Tx | Serial transmission pin |
| 3 | UART_Rx | UART Rx | Serial reception pin |
| 4 | GND | Ground | Ground connection |
| 5 | VCC | Power Input | 5V power input |
Ensure the power supply provides at least 200mA of current to guarantee stable operation.
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Installation:
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The module can be installed either on the ceiling or wall, depending on the desired coverage area.
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Ensure that the radar antenna is facing the area to be monitored and that the surrounding space is free from obstructions. The installation environment should avoid interference factors, such as animals or large objects that are continuously moving.
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Configuration:
Using Bluetooth:
The sensor supports Bluetooth functionality, allowing users to configure the radar via a mobile app. You can download the supported app from the app store (available for Android and iOS).
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After installation, open the app and connect to the sensor.
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You can adjust the sensor’s detection range, sensitivity, and detection delay using the app's interface.
Using UART Communication:
Alternatively, you can connect the sensor to a PC and use the configuration tool to adjust settings.
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The module communicates via UART with a default baud rate of 256000.
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The configuration tool allows users to set the maximum detection distance, adjust sensitivity, and configure the unmanned delay time.
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Configuration Parameters:
Users can modify the configuration parameters of the module via the serial port to suit different application needs. Configuration settings are retained even when power is turned off. Configurable parameters include:
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Maximum Detection Distance: Set the maximum detectable distance, where only human targets within this range will be detected and reported.
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Sensitivity: The energy value of the detected target (ranging from 0 to 100) must exceed the sensitivity threshold for the target to be recognized. Each distance gate’s sensitivity can be independently adjusted.
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Unmanned Duration: When the radar transitions from detecting "human" to "no human", it will report "human" for a duration. If the radar does not detect a human within that time frame, it will report "no human".
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Visualization Configuration Tool:
A PC-based configuration tool has been developed to enhance the efficiency of testing and configuration processes. This software interfaces with the module’s serial port to facilitate parameter reading and configuration. Additionally, it provides a real-time display of detection results, thereby improving user engagement with the system.
How to Use the Configuration Tool:
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Connect the module’s serial port using a USB-to-serial tool.
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Select the appropriate serial port number in the configuration tool, set the baud rate to 256000, choose engineering mode, and click connect device.
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Once connected, click start to display the detection results and data on the graphical interface.
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After connecting, you can read or set the parameters by clicking stop.
Note: Parameters cannot be read or configured while the start button is clicked. You must stop the process before adjusting configurations.
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Installation Conditions:
Confirm Minimum Installation Clearance:
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If the radar is to be installed in a casing, the casing must have good wave-transmitting properties at 24GHz and must not contain metal materials or materials that shield electromagnetic waves.
Installation Environment Requirements:
The product needs to be installed in a suitable environment. If used in the following conditions, detection performance may be affected:
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Continuous motion of non-human objects within the sensing area, such as animals, continuously swinging curtains, or large plants near air vents.
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Large areas of strong reflectors in the sensing area may interfere with the radar antenna.
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When wall-mounted, consider external interference from room air conditioners, electric fans, etc.
Installation Considerations:
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Ensure the radar antenna is facing the area to be detected, with the antenna's surroundings open and unobstructed.
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Ensure the installation position of the sensor is secure and stable, as the radar's own movement can affect detection performance.
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Ensure no objects behind the radar are moving or vibrating. Radar waves have penetration properties, and the antenna's back lobe may detect objects moving behind the radar. You can use a metal shield or metal backplate to block the radar's back lobe and reduce the impact of objects behind the radar.
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The theoretical distance accuracy of the radar is derived from a physical resolution of 0.75 meters, processed through a special algorithm. Due to differences in the target's size, state, and RCS, the accuracy of target distance will fluctuate, and the maximum detection range may also slightly vary.
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Application Scenarios:
The HLK-LD2410B module is suitable for various applications, including:
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Smart Lighting Control: Automatically detect whether someone is in a room and control lighting accordingly.
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Security Systems: Used to detect human intrusions and trigger alarms or security devices.
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Smart Appliances: Automatically turn off devices like air conditioners and TVs when no one is in the room to save energy.
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Health & Safety: Monitor dangerous environments to prevent hazardous equipment (such as UV lamps) from activating when people are nearby.
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Maintenance and Troubleshooting:
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Ensure the sensor is free from physical obstructions.
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Adjust sensitivity if the sensor is either too sensitive (detecting irrelevant movements) or not sensitive enough (failing to detect human presence).
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Ensure Bluetooth or UART communication settings are correct for configuration and parameter adjustments.
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