The HLK-LD2420 is a high-performance 24 GHz automotive-grade radar module designed with a 1T1R (single transmitter and receiver) antenna for advanced human presence detection. Utilizing millimeter-wave (mmWave) radar technology and the sophisticated signal processing of the S3 series chips, this module achieves pinpoint accuracy in detecting human bodies whether they are moving, exhibiting micro-movements, or standing perfectly still. Primarily optimized for indoor AIoT environments, the HLK-LD2420 provides real-time updates on occupancy. With a maximum detection range of 8 meters, users can independently configure distance intervals, sensitivity levels, and refresh rates across specific zones. Its GPIO and UART interfaces offer a plug-and-play experience, making it an ideal choice for diverse smart home and industrial automation end-products. Product Parameters Single-chip smart mmWave SoC with integrated intelligent algorithm firmware Ultra-compact dimensions: 20 mm × 20 mm for easy integration Plug-and-play: Pre-loaded with default body sensing configurations 24 GHz ISM band operation with FCC, CE, and SRRC regulatory compliance Voltage compatibility: 3.3 V typical (operates between 3.0 V to 3.6 V) Power consumption: Average operating current of 50 mA Detection capabilities: Sensitive to both motion and micro-motion Real-time reporting: Instant output of detection states and target distance Visualization tools: Facilitates easy adjustment of detection gates and sensitivity Interference shielding: Supports range division to block out-of-zone interference Close-range sensing: Minimum distance of 0.2 m with zero blind zones Extended range: Motion sensing up to 8 m Wide field of view: Large detection angle of ±60° Flexible installation: Supports both ceiling and wall mounting Application Scenarios The HLK-LD2420 is highly versatile and excels in identifying moving or stationary human targets across various AIoT domains: Smart Home: Intelligent control of home appliances (AC, TV, Lighting) based on occupancy and distance. Smart Business: Automated screen activation and device power management in kiosks or digital signage when customers approach. Smart Security: Enhanced reliability for access control, building intercoms, and smart door locks. Smart Lighting: Accurate human positioning for public lighting, ensuring energy efficiency in hallways and warehouses. System Description The HLK-LD2420 is a high-precision sensor based on the Hi-Link S3 series millimeter-wave chip. It employs FMCW (Frequency Modulated Continuous Wave) modulation to analyze the reflected signals, allowing the internal intelligent algorithm to distinguish human presence from environmental noise in real-time. By leveraging this reference solution, developers can significantly reduce time-to-market for their own radar-based products. The hardware architecture comprises the Hi-Link Radar SoC, a 24 GHz antenna array, and a host MCU. Complementary software and visual configuration tools allow for fine-tuning of the sensor's performance to suit specific environmental requirements. Packing List HLK-LD2420 1 x LD2420 Module HLK-Test-Kit 1 x Test Kit w/o Module FAQ 1. What is the difference between the LD2420 and the LD2410 series?The LD2420 utilizes the S3 series chip, which offers enhanced signal processing and higher stability for stationary presence detection compared to earlier models. It also features a different hardware architecture for industrial and automotive-grade applications. 2. Can the HLK-LD2420 detect a person through a wall?Yes, mmWave signals can penetrate thin non-metallic materials like glass, plastic, and drywall. However, metal, water, and thick reinforced concrete will block the signal significantly. 3. How do I configure the sensor parameters?You can connect the module to a PC via a USB-to-TTL adapter and use the Hi-Link Visualization Tool to adjust sensitivity, detection distance, and reporting delay in real-time. 4. Does environmental wind or heat affect the detection?Unlike PIR sensors, which rely on heat signatures, radar sensors are not affected by temperature changes or airflow. This makes the LD2420 far more reliable in harsh environments or near heating vents. 5. What is "Micro-motion" detection?Micro-motion refers to very small movements, such as the breathing of a person sitting still or typing. The LD2420 is sensitive enough to detect these movements to prevent lights from turning off while a room is still occupied. 6. Can I use multiple LD2420 modules in the same room?Yes, since it operates on the 24 GHz ISM band, multiple sensors can be used. However, it is recommended to maintain a certain distance or angle between them to avoid direct signal interference.
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