1. Introduction
The Hi-Link HLK-LD2411S is a 24 GHz FMCW radar sensor module designed for accurate motion and micro-motion human body detection and ranging. It integrates simplified radar sensor hardware with intelligent algorithm firmware (RM01) to provide real-time detection results.
The module's hardware comprises a 24 GHz millimeter-wave radar chip, a high-performance micro-strip antenna for sending and receiving, a low-cost MCU, and essential peripheral circuits. Its flat beam design offers a detection range of 20° in the E-surface direction and 45° in the H-surface direction, allowing flexible placement according to application needs.
The intelligent RM01 firmware utilizes FMCW waveform and proprietary advanced signal processing technology to achieve precise human body distance measurement and detect both motion and subtle micro-motion.
2. Key Features
- Operates in the 24 GHz ISM band.
- Integrates an intelligent millimeter-wave radar single chip with intelligent algorithm firmware.
- Provides accurate indoor/outdoor human motion/micro-motion sensing and distance detection.
- Requires a 5V single power supply.
- Features a continuous working average current of 48mA at a 20 Hz reporting frequency.
- Includes visualization tools for configuring detection distance intervals and setting sensitivity by distance gate.
- Offers a maximum human body induction distance of 6m and a micro-motion human body induction distance of 3.5m.
- Achieves high-precision ranging: 30~350cm with ±5cm accuracy; 350~600cm with ±5% accuracy.
- Detection angle: Azimuth +20°, Elevation +45°.
3. Product Components
The HLK-LD2411S is available as a standalone module or as part of a kit. The kit includes additional components for easier integration and development.
3.1 HLK-LD2411S Module
Image: The HLK-LD2411S radar module, showing its compact design and pinout for power and data transmission.
3.2 HLK-LD2411S Kit (Optional)
The HLK-LD2411S Kit typically includes:
- HLK-LD2411S Module
- SH1.27mm 5pin to DuPont Line
- 5pin to Leadwire
- CH340 serial port board (for USB-to-serial communication)
Image: Components of the HLK-LD2411S Kit, including the radar module, connection cables, and a CH340 serial port board.
4. Technical Specifications
| Parameter | Notes | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Frequency band | 24 | 24.25 | GHz | ||
| Maximum sweep bandwidth | 0.25 | GHz | |||
| Maximum equivalent isotropic radiated power | Adjusting the transmit power can change this parameter | 9 | 16 | 16.8 | dBm |
| Supply voltage | 4.5 | 5.0 | 5.5 | V | |
| Ambient temperature | -40 | - | 85 | °C | |
| Distance detection range | Micro-motion human target | 0.3 | - | 3.5 | m |
| Moving human target | 0.3 | - | 6 | m | |
| Ranging accuracy | Close distance: 30~350cm | - | ±5% | - | cm |
| Far distance: 350~600 cm | - | ±5% | - | cm | |
| Average current | 50ms reporting period | 48 | mA | ||
| Detection Angle | Azimuth +20° | Elevation +45° |
4.1 Module Dimensions
Top View Dimensions (e.g., 27.50mm x 27.50mm)
Side View Dimensions (e.g., 1.25mm pin pitch)
Images: Detailed mechanical dimensions of the HLK-LD2411S module, showing top and side views with measurements.
5. Setup and Connection
The HLK-LD2411S module features a 5-pin interface for power and serial communication. Refer to the pinout diagram below for correct connections.
Image: Product diagram illustrating the 5-pin interface and their functions.
5.1 Pin Description
- Pin 1 (VIN): 5V Input power. Connect to a stable 5V DC power source.
- Pin 2 (GND): Power ground. Connect to the common ground of your system.
- Pin 3 (OUT): Induction output high level. This pin provides a high-level signal upon detection.
- Pin 4 (TXD): Serial port transmit data / IO. Used for transmitting data from the module.
- Pin 5 (RXD): Serial port receive data / IO. Used for receiving data by the module.
For initial setup and configuration, it is recommended to use the HLK-LD2411S Kit which includes a CH340 serial port board for easy connection to a computer via USB.
6. Operation and Configuration
The HLK-LD2411S module operates by detecting human motion and micro-motion within its detection range and reporting the distance. The module's parameters can be configured using dedicated software tools.
6.1 Detection Capabilities
- Micro-motion detection: Capable of detecting subtle movements (e.g., breathing) within 0.3 to 3.5 meters.
- Motion detection: Capable of detecting larger movements within 0.3 to 6 meters.
Image: Illustration of the 24G ranging radar sensor module's capabilities, highlighting wiggle (micro-motion) and move detection ranges.
6.2 Parameter Adjustment Software
Hi-Link provides "Upper Computer Software" (PC software) to adjust various parameters of the module. This software allows users to:
- Configure detection distance intervals.
- Set sensitivity for different detection zones (distance gates).
Image: Screenshot indicating the availability of Upper Computer Software for parameter adjustment, including detection distance and sensitivity.
For detailed instructions on using the software and interpreting data, please refer to the official documentation provided by Hi-Link (e.g., user manual PDF, if available).
6.3 Product Overview Video
Video: An overview of the HLK-LD2411S radar sensor module, showcasing its features and production process.
7. Application Scenarios
The HLK-LD2411S module is versatile and can be integrated into various AIoT (Artificial Intelligence of Things) applications requiring human presence and motion detection. Common applications include:
- Smart Home: Perceive human movement/micro-movement and distance to intelligently control home appliances (e.g., lights, HVAC systems) based on occupancy.
- Smart Business: Implement sensor-based controls for automatic doors, escalators, and other commercial automation systems.
- Smart Lighting: Enable induction lighting systems that activate or adjust brightness based on human presence in a room or area.
- Smart Security: Enhance security systems with induction access control, building intercoms, and electronic peepholes for advanced human detection.
8. Maintenance
The HLK-LD2411S module is designed for low maintenance. To ensure its longevity and optimal performance:
- Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning if necessary.
- Avoid exposing the module to extreme temperatures, high humidity, or corrosive environments beyond its specified operating conditions.
- Ensure proper ventilation if the module is enclosed, to prevent overheating.
- Handle the module with care to prevent physical damage to the PCB or antenna.
9. Troubleshooting
- No Detection:
- Verify power supply (5V) and ground connections are correct and stable.
- Check serial communication lines (TXD/RXD) for proper wiring and baud rate settings.
- Ensure the module's detection angle and range are appropriate for the environment. Adjust placement if necessary.
- Confirm that the "Upper Computer Software" parameters (sensitivity, distance gates) are correctly configured.
- False Detections:
- Reduce sensitivity settings using the configuration software.
- Adjust the module's placement to avoid detecting unwanted areas or objects.
- Ensure there are no strong electromagnetic interferences near the module.
- Inaccurate Ranging:
- Ensure the module is mounted securely and not vibrating.
- Check for obstructions or reflective surfaces that might interfere with radar signals.
- Recalibrate or adjust ranging parameters using the configuration software.
- Communication Issues:
- Verify the serial port settings (baud rate, data bits, parity, stop bits) match the module's requirements.
- If using the CH340 serial board, ensure drivers are correctly installed on your computer.
- Check for loose connections in the serial interface.
10. User Tips
- For optimal performance, avoid placing the module directly facing large metallic objects or highly reflective surfaces, as this can cause signal interference.
- When integrating into an enclosure, ensure the material is radar-transparent (e.g., plastic, thin glass) and does not obstruct the module's antenna.
- Regularly check for firmware updates from Hi-Link to benefit from improved algorithms and features.
- Experiment with different sensitivity and distance gate settings in the configuration software to fine-tune detection for your specific application environment.
11. About the Manufacturer
Shenzhen Hi-Link IoT Module Store (Hi-Link Electronics Co., Ltd) is dedicated to the development and production of IoT modules. They emphasize manufacturing capability, advanced equipment, and quality control to ensure high-quality products.
Image: Overview of Hi-Link's manufacturing capabilities, advanced equipment, and exhibition presence.
12. Technical Support and Contact
For technical assistance, documentation, or any inquiries regarding the HLK-LD2411S module, please contact Hi-Link directly:
- Email: annie@hlktech.com
- WhatsApp: +86 18797402505
