1. Introduction
The HLK-LD2410C is a high-sensitivity 24GHz human presence status sensing module developed by Hilink Electronics. This module utilizes Frequency-Modulated Continuous Wave (FMCW) technology to detect human targets within a defined space. Through advanced radar signal processing and a precise human body induction algorithm, it achieves highly sensitive human presence detection, capable of identifying both moving and stationary human bodies. It also provides auxiliary information such as the distance to the target.
This product is primarily designed for indoor applications to sense the presence of moving or micro-moving human bodies and output real-time detection results. It offers a maximum sensing distance of up to 6 meters with a distance resolution of 0.75 meters.
Figure 1: HLK-LD2410C Human Presence Sensor Module. This image shows the compact design of the sensor module with its integrated antenna and main processing chip.
2. Features
- High-sensitivity 24GHz radar for human presence detection.
- Utilizes FMCW (Frequency-Modulated Continuous Wave) technology.
- Detects both moving and stationary human bodies.
- Provides target distance information.
- Maximum sensing distance: 6 meters.
- Distance resolution: 0.75 meters.
- Supports GPIO and UART output for flexible integration.
- Comes with a visual configuration tool for easy parameter adjustment.
- Plug-and-play functionality.
- Power supply: 5V.
3. Setup and Connection
The HLK-LD2410C module is designed for straightforward integration. Ensure proper power supply and data connections as described below.
3.1 Pinout Description
Refer to the pinout diagram for correct wiring. The module requires a 5V power supply.
Figure 2: HLK-LD2410C Pinout Diagram. This diagram illustrates the connection points: TX (UART Transmit), RX (UART Receive), OUT (GPIO Output, High when human detected), GND (Ground), and VCC (5V Power Supply).
- VCC: Power positive (5V DC input).
- GND: Ground connection.
- OUT: GPIO output. This pin goes high when a human is detected.
- RX: UART Receive pin.
- TX: UART Transmit pin.
3.2 Power Supply
Connect a stable 5V DC power source to the VCC and GND pins. Ensure the power supply can provide sufficient current for the module's operation.
3.3 Data Interface
The module supports both GPIO and UART communication. For basic presence detection, the OUT pin can be used. For detailed data and configuration, connect the TX and RX pins to a UART interface (e.g., a microcontroller or a USB-to-serial converter).
4. Operating Instructions
The HLK-LD2410C module operates by emitting 24GHz FMCW radar signals and analyzing the reflections to detect human presence. It can distinguish between moving and stationary targets.
4.1 Sensing Range and Placement
The module can detect human presence up to 6 meters. Optimal placement depends on the desired detection area. Consider mounting it on the ceiling or a wall for best coverage.
Figure 3: HLK-LD2410C Sensing Range and Placement Examples. This image illustrates typical installation scenarios: ceiling mount (2.6-3m high) for overhead coverage and wall mount (1.5-2m high) for horizontal coverage, showing the effective detection cone.
- Ceiling Mount: Typically installed at 2.6-3 meters high for broad area coverage.
- Wall Mount: Typically installed at 1.5-2 meters high for directional coverage.
4.2 Visual Configuration Tool
The module provides a visual configuration tool for PC, allowing users to easily adjust sensing parameters. This tool connects via a serial port and enables configuration of sensing distance range, sensitivity for different intervals, and unmanned delay time.
Figure 4: HLK-LD2410C Visual Configuration Tool Interface. This screenshot displays the PC software interface used to configure the sensor module, showing parameters like moving target and motionless target detection, sensitivity settings, and real-time data visualization.
Using the Host Computer Tool:
- Connect the module's serial port to your PC using a USB-to-serial tool.
- In the configuration software, select the correct serial port number.
- Set the baud rate to 256000.
- Select "Engineering Mode" and click "Connect Device".
- Upon successful connection, click the "Start" button. The graphical interface will display test results and data.
- To read or set parameters, ensure the "Start" button is not clicked, or click "Stop" before making changes. Configuration can only be performed when the module is stopped.
5. Specifications
| Parameter | Value |
|---|---|
| Model | HLK-LD2410C |
| Operating Frequency | 24GHz |
| Modulation Mode | FMCW |
| Power Supply | 5V DC |
| Sensing Distance | 0.75 - 6 meters |
| Distance Resolution | 0.75 meters |
| Output Interface | GPIO, UART |
| Dimensions (L x W) | 22mm x 16mm |
Figure 5: HLK-LD2410C Module Dimensions. This image shows the physical dimensions of the module, measuring 22mm in length and 16mm in width.
6. Maintenance
The HLK-LD2410C module is designed for reliable operation with minimal maintenance. Follow these guidelines to ensure its longevity:
- Environmental Conditions: Operate the module within its specified temperature and humidity ranges. Avoid extreme temperatures, direct sunlight, and high humidity.
- Cleaning: Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning. Do not use liquid cleaners or solvents.
- Physical Handling: Handle the module with care to prevent physical damage to the components or connectors. Avoid static discharge when handling.
- Power Supply: Ensure a stable and correct 5V power supply is always used. Incorrect voltage can damage the module.
7. Troubleshooting
If you encounter issues with your HLK-LD2410C module, consider the following troubleshooting steps:
- No Detection:
- Verify the 5V power supply is correctly connected and stable.
- Check all wiring connections (VCC, GND, OUT, TX, RX) for proper contact.
- Ensure the module is placed within the optimal sensing range and orientation (refer to Section 4.1).
- Confirm that the detection area is clear of obstructions that might block radar signals.
- If using the configuration tool, check the sensitivity settings; they might be too low.
- Incorrect Detection:
- Adjust the sensitivity parameters using the visual configuration tool (refer to Section 4.2).
- Ensure there are no strong interfering 24GHz signals in the environment.
- Verify the module's firmware is up to date (if applicable, check manufacturer's website).
- UART Communication Issues:
- Confirm the baud rate is set to 256000 in your host system or configuration tool.
- Check TX/RX connections; ensure TX of one device is connected to RX of the other, and vice-versa.
- Verify the serial port driver is correctly installed on your PC.
- Module Not Powering On:
- Double-check the power supply voltage (must be 5V) and polarity.
- Inspect the module for any visible physical damage.
8. Warranty & Support
8.1 Warranty Information
This HLK-LD2410C module comes with a 3-month warranty from the date of purchase. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by misuse, accident, unauthorized modification, or improper installation.
8.2 Technical Support
For technical assistance, questions, or warranty claims, please contact Rakstore customer support through the platform where the product was purchased. Provide your purchase details and a clear description of the issue to facilitate prompt support.
You may also refer to the official documentation and resources provided by Hilink Electronics for detailed technical specifications and application notes.
