1. Introduction
The Hi-Link HLK-LD2412 is a high-sensitivity 24GHz human presence sensing module designed for detecting human targets within a defined space. Utilizing FMCW (Frequency Modulated Continuous Wave) radar technology, combined with advanced signal processing and a precise human body sensing algorithm, this module can identify both moving and stationary human presence. It also provides auxiliary information such as target distance.
Primarily intended for indoor applications, the HLK-LD2412 detects human movement or micromovement in an area and outputs real-time detection results. Its maximum sensing distance extends up to 9 meters, with a distance resolution of 0.75 meters. The module offers visual configuration tools, allowing users to easily adjust the induction distance range, sensitivity for different intervals, and unmanned delay time to suit various specific application requirements.
Supporting both GPIO and UART output, the HLK-LD2412 is designed for plug-and-play functionality, making it highly adaptable for integration into diverse intelligent scenarios and end products.
2. Specifications
The HLK-LD2412 module offers robust performance for human presence detection. Key specifications are detailed below:
| Parameter | Value (HLK-LD2412) |
|---|---|
| Operating Frequency Band | 24.075-24.175GHz |
| Feature | Longest sensing distance up to 9m (adjustable) |
| Transmitting Power | 20dBm |
| Power Consumption | DC 5V or DC 3.3V supply, average operating current >200mA |
| Detection Distance | 9m (adjustable) |
| Detection Angle | ±75° |
| Referencing Method | APP/Serial port uplink |
| Output Type | Serial protocol / High and low levels |
| Product Dimensions (L x W x H) | 28.00mm x 11.00mm x 2mm (main board, excluding pins) |
| Communication Method | Bluetooth-Compatible (for APP configuration) |
3. Setup
3.1 Module Dimensions and Pinout
The HLK-LD2412 module is compact, designed for easy integration. Refer to the diagram below for precise dimensions and pin assignments.
Pinout Description:
- OUT: Output pin (GPIO)
- GND: Ground
- +5V: 5V Power Supply Input
- 3V3: 3.3V Power Supply Input (can also be used as output if 5V is supplied)
- G: Ground
- RX: UART Receive Data
- TX: UART Transmit Data
Ensure correct power supply (either 3.3V or 5V) and proper connection of UART (RX/TX) and GPIO (OUT) pins to your host system.
3.2 Installation Methods
The HLK-LD2412 module supports various installation methods, including ceiling-mounted and wall-mounted, to optimize detection coverage for different environments.
When installing, consider the desired detection area and potential obstructions. The module's good shell penetration allows it to be hidden inside non-metallic enclosures, enhancing product aesthetics without compromising performance.
4. Operating Instructions
The HLK-LD2412 module is designed for flexible operation and configuration to meet diverse application needs.
4.1 Basic Operation
Once powered, the module begins sensing human presence. Detection results are output via the configured GPIO or UART interface. The module can detect both moving and static human bodies, including micromovements.
4.2 Configuration and Debugging
The HLK-LD2412 supports multi-level intelligent parameter adjustment through visual debugging and configuration tools. These tools allow you to customize various operational parameters:
- Induction Distance Range: Define the minimum and maximum detection distances.
- Induction Sensitivity: Adjust sensitivity levels for different distance intervals to fine-tune detection accuracy and reduce false positives.
- Unmanned Delay Time: Set the duration after which the module reports "no presence" if no human activity is detected.
Configuration is typically performed via an APP or serial port uplink. Refer to the specific software documentation provided by Hi-Link for detailed instructions on using the visual configuration tools and connecting via Bluetooth-Compatible or serial interface.
5. Application Scenarios
The HLK-LD2412 human body sensing module's ability to detect motion, micro-movement, standing, and sitting positions makes it suitable for a wide range of AIoT applications:
- Human Body Induction Light Control: Automatic control of lighting based on human presence, ideal for public places, induction lights, and bulb lights.
- Advertising Screen and Device Awakening: Automatically turn on advertising screens or other devices when a person approaches and enter sleep mode when no one is present, saving power and enhancing information delivery efficiency.
- Life Safety Protection:
- UV lamp work protection: Prevents UV lamps from being activated when people are nearby, avoiding personal injury.
- Dangerous area monitoring: Automatic detection and alarm for unauthorized entry into high-risk spaces (e.g., coal mine blasting areas).
- Smart Home Appliances: Automatically turn off TVs, air conditioners, and other electrical appliances when a room is unoccupied for an extended period, promoting energy saving and safety.
- Intelligent Security: Detection and identification of intruders or individuals lingering within specified security zones.
6. Maintenance
The HLK-LD2412 module is designed for low maintenance. To ensure optimal performance:
- Keep the module clean and free from dust or debris, especially the antenna area.
- Ensure proper ventilation if enclosed, to prevent overheating.
- Avoid exposing the module to extreme temperatures or humidity outside its specified operating range.
- Regularly check power connections for stability.
7. Troubleshooting
If you encounter issues with your HLK-LD2412 module, consider the following troubleshooting steps:
- No Detection / Intermittent Detection:
- Check Power: Ensure the module is receiving stable 3.3V or 5V power.
- Verify Connections: Confirm all pins (power, ground, UART, GPIO) are correctly connected and secure.
- Review Placement: Ensure the module's detection area is not obstructed by large metallic objects or thick walls.
- Adjust Sensitivity: Use the configuration tools to increase the sensitivity, especially for detecting micromovements or at longer distances.
- Check Detection Angle: Ensure the module is oriented correctly to cover the desired area (±75° detection angle).
- False Positives (Detecting when no one is present):
- Adjust Sensitivity: Decrease the sensitivity using the configuration tools.
- Environmental Factors: While robust, extreme vibrations or rapid air movements might occasionally trigger detection. Ensure stable mounting.
- Interference: Ensure no other 24GHz devices are operating in close proximity that could cause interference.
- Communication Issues (UART/APP):
- Check Wiring: Double-check RX/TX connections.
- Baud Rate: Ensure your host system's serial port baud rate matches the module's default or configured baud rate.
- APP Connectivity: For Bluetooth-Compatible APP, ensure Bluetooth is enabled on your device and the module is discoverable/paired correctly.
8. User Tips
- Optimal Placement: For ceiling-mounted applications, a height of 2.6m-3m is generally recommended. For wall-mounted, 1.5m-2m is suitable. Experiment with placement to achieve the best coverage for your specific environment.
- Fine-tuning Sensitivity: The ability to adjust sensitivity for different distance "doors" is a powerful feature. Use it to create zones where detection is more or less sensitive, preventing unwanted triggers or ensuring detection in critical areas.
- Non-Metallic Enclosures: Take advantage of the module's shell penetration capability by integrating it into non-metallic enclosures for a cleaner, more aesthetic installation.
- Power Supply Stability: A stable and clean power supply (3.3V or 5V) is crucial for reliable operation. Use a regulated power source.
9. Warranty and Support
For technical support, warranty inquiries, or further assistance with your Hi-Link HLK-LD2412 module, please contact Shenzhen Hi-Link Electronic Co., Ltd. directly.
Contact Information:
- Email: cassie@hlktech.com
- WhatsApp: +8618772540811
Please retain your purchase receipt for warranty purposes.
