What is HLK-LD2420 and how to use it?
29 Jan 2025
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What is HLK-LD2420?
The HLK-LD2420 is an advanced 24 GHz human body sensing module designed to detect motion and human presence. It operates based on microwave radar technology and can accurately detect human movement within a range of 0.2 meters to 8 meters. Ideal for IoT applications, this module is used in smart homes, industrial automation, security systems, and healthcare.
What Are the Key Features of HLK-LD2420?
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Frequency Range: Operates in the 24 GHz ISM frequency band.
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Motion Detection: Capable of detecting large movements as well as micro movements.
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Detection Range: Up to 8 meters horizontally with a ±60° vertical range.
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Low Power Consumption: Consumes only 50 mA on average.
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Interfaces: Supports SWD for debugging and UART for communication.
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Compact Design: Measures just 20mm x 20mm, making it easy to integrate into various systems.
Why Choose This Product?
- Accurate and Reliable: Utilizes FMCW radar technology, ensuring precise detection even in challenging environments.
- Versatile: Can be used for a wide range of applications including smart home automation, security systems, and industrial safety.
- Energy Efficient: With low power consumption, it is suitable for battery-powered and long-lasting systems.
- Easy Integration: Features standard UART and SWD interfaces, allowing for seamless integration with various platforms.
How to Use HLK-LD2420
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Connect the Sensor
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Connect the 3.3V power supply to the J2P1 pin.
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Connect GND to J2P2 for grounding.
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Use J2P3 (OT1) for UART_TX and J2P4 (OT2) for UART_RX communication.
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Installation
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The HLK-LD2420 supports both ceiling mount and wall mount installations.
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Ceiling Mount: The recommended height for installation is between 2.7m and 3m, which provides the module with a detection range of 5 meters.
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Wall Mount: Mounting height should be between 1.5m and 2m, which offers a detection range of 8 meters.
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Configuration
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Configure the module’s detection sensitivity and range through the available interfaces.
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Use the UART connection to send configuration commands and adjust parameters for the required application.
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Configuration Parameters
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Detection Range: Configurable up to 8 meters.
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Sensitivity: Adjust the detection sensitivity to identify larger or smaller movements.
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Operating Voltage: Input voltage of 3.0V to 3.6V.
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Visualization Configuration Tool
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Use the visual configuration tool to modify the operational settings and optimize the performance of the module in different environments.
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The tool allows users to set parameters such as sensing distance, sensitivity, and reporting interval.
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Installation Conditions
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Ensure that the installation location is free from heavy metallic objects or strong electromagnetic interference, as these can affect the performance of the sensor.
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The module works best when placed in open spaces, avoiding obstructions that could block the detection area.
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Application Scenarios
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Smart Homes: For automating lighting, security, and HVAC systems based on motion.
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Security Systems: Used in security cameras and monitoring devices for detecting unauthorized movement.
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Industrial Automation: Ideal for safety monitoring systems that detect human presence in hazardous areas.
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Healthcare: For fall detection or patient monitoring systems.
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Maintenance and Troubleshooting
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Ensure the module is free from dust and moisture to maintain optimal performance.
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If the module does not detect motion as expected, check the sensitivity settings and mounting position.
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In case of communication issues, check the UART connections for proper wiring.
