The LD2411-S is a high-precision motion and micro-motion human body induction ranging sensor within the Hi-link radar series. It integrates a highly simplified 24 GHz radar sensor hardware platform with the intelligent algorithm firmware RM01. This reference design is optimized for single-target scenarios. In environments where multiple targets are present, the system is engineered to prioritize and lock onto the target with the highest echo energy, ensuring reliable tracking in complex spaces. The LD2411-S hardware features a 24GHz millimeter-wave radar chip, a high-performance 1T1R (one transmitter, one receiver) microstrip antenna, and a cost-effective MCU. The radar beam utilizes a flat beam design, providing a detection range of 20° in the E-plane and 45° in the H-plane. This directional flexibility allows users to optimize the sensor's orientation based on specific installation requirements. Equipped with FMCW waveform technology and advanced signal processing proprietary to the S3 series chip, the RM01 firmware delivers precise human ranging and highly sensitive detection of both motion and micro-movements (such as breathing or typing). Product Features 24 GHz ISM frequency band operation for global compliance Integrated intelligent millimeter-wave radar SoC and advanced firmware Highly accurate indoor/outdoor motion and micro-motion sensing Reliable 5V single power supply design Low power consumption with a continuous working average current of 48mA at 20 Hz Comprehensive visualization tools for configuring distance gates and sensitivity Maximum sensing range: 6m for motion and 3.5m for micro-motion High-precision ranging: 30~350cm (±5cm) and 350~600cm (±5%) Optimized beam angles: Azimuth ±20° and Pitch ±45° Application Scenarios The LD2411-S provides real-time distance reporting and human presence detection, making it an essential component for various AIoT applications: Smart Home: Enables intelligent appliance control by perceiving human movement and distance to automate lighting, AC, and security. Intelligent Commerce: Perfect for induction doors, smart escalators, and automated kiosks. Intelligent Lighting: Accurate triggering for hallway lights and ambient office lighting based on occupant proximity. Intelligent Security: Enhances access control, building intercoms, and electronic "cat-eye" doorbells with distance-based alerts. Configuration & Parameter Adjustment Step 1: ConnectionOpen the upper computer software and click "Refresh." Select the correct serial port and baud rate, then click "Connect Device." Once successful, the firmware version will be displayed. Step 2: Parameter SettingClick "Parameter Configuration" to open the settings interface. Users can define detection intervals and sensitivity levels. Click "Set Parameter" to upload these values to the radar module. Step 3: Real-time MonitoringClick "Start" to view live data. The interface displays target distance and status, alongside a 15-second distance curve for historical tracking. Step 4: Data LoggingClick "Stop" to end the session. All test data is automatically saved in the Log folder within the software directory for later analysis. Packing List HLK-LD2411S 1 x LD2411S Module HLK-Test-Kit 1 x Test Kit w/o Module FAQ 1. What is the difference between motion and micro-motion detection?Motion detection identifies large movements like walking or waving, while micro-motion detection can sense very small movements, such as breathing or slight head movements, ensuring the sensor knows a person is present even if they are sitting still. 2. Can the LD2411-S distinguish between two people?The module is designed for single-target scenarios. If multiple people are in the sensing area, the radar will prioritize and report the distance of the target with the strongest echo signal. 3. How does the flat beam design affect installation?The flat beam (20° E-plane / 45° H-plane) means the sensor is more sensitive horizontally or vertically depending on how you rotate it. This is ideal for narrow corridors or wide-area doorway induction. 4. Is this sensor suitable for outdoor use?Yes, the 24 GHz radar technology is highly resistant to environmental factors like temperature, light, and dust, making it effective for both indoor and outdoor induction tasks. 5. What is the minimum detection distance?The high-precision ranging starts at 30cm. Objects closer than this may not be reported accurately due to the near-field limitations of the microstrip antenna. 6. Does it require a specific library for MCU integration?The LD2411-S uses a standard UART communication protocol. You can read the ASCII output directly with any microcontroller (Arduino, ESP32, STM32) without needing complex proprietary libraries.
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