1. Introduction
The HLK-LD8001 is a state-of-the-art radar sensing module designed for high-precision continuous liquid and material level measurement. Developed around the ADT3102 chip, it integrates a 76-81GHz RF transceiver system, a 1T1R PCB high-gain antenna, 1MB flash memory, a radar signal processing unit, and an ARM® Cortex®-M3 core. Utilizing an FMCW signal processing mechanism combined with advanced radar signal processing algorithms, this module delivers accurate ranging capabilities for various applications.
2. Product Characteristics
- Radar Detection Based on FMCW FM Continuous Wave Signal
- Measuring distance up to 15m
- Highly accurate continuous measurement with an error of +/-5mm
- Antenna -3dB Beam Angle: 100° Horizontal, 80° Tilt
- Supports SPI, UART, I2C standard communication interfaces
- Compact size: R=19.5mm, designed for pin header connection
- Flexibility to add lenses to modify the antenna angle
- Unaffected by environmental factors such as temperature, humidity, noise, airflow, dust, and light
3. Application Scenarios
The HLK-LD8001 module is suitable for a wide range of applications requiring precise liquid or material level detection:
- Industrial level measurement
- Sewer level detection
- Non-contact measurement of medical acidic and alkaline liquids
- Fuel tanks, IBC tonne drums, and viscous liquid measurement
4. Specifications
4.1. Functional Characteristics
| Parameter Content | Min. | Typ. | Max. | Unit. |
|---|---|---|---|---|
| Maximum range | 15 | m | ||
| Measurement blindness | 14 | |||
| Measurement accuracy | +/-5 | mm | ||
| Response time | 200 | ms |
4.2. Electrical Characteristics
| Operating Parameters | Min. | Typ. | Max. | Unit. |
|---|---|---|---|---|
| Work voltage (VCC) | 3.5 | 3.3 | 3.5 | V |
| Work current (ICC) | 135 | 600 | mA | |
| Work temperature (TOP) | -20 | 85 | °C | |
| Storage temperature (TST) | -40 | 85 | °C |
4.3. RF Characteristics
| Operating Parameters | Min. | Typ. | Max. | Unit. |
|---|---|---|---|---|
| Work frequency | 79 | 81 | GHz | |
| Firing power (Pout) | 12 | dBm | ||
| Antenna gain | 10 | dBi | ||
| Horizontal beam (-3dB) | -50 | 50 | ° | |
| Vertical beam (-3dB) | -40 | 40 | ° |
4.4. Physical Dimensions
The HLK-LD8001 module has a compact circular design with a radius of 19.5mm.
5. Setup and Installation
The HLK-LD8001 module is designed for easy integration using pin headers and standard communication interfaces.
5.1. Package Contents (HLK-LD8001 KIT)
A typical HLK-LD8001 KIT includes:
- HLK-LD8001 Radar Module
- Multifunctional Test Board
- 2.54mm Dupont Line (x4)
- Type-C Cable (x1)
5.2. Pinout and Connections
The module features various pins for power, communication, and control. Refer to the product diagram (Figure 4.1) and physical views (Figure 4.2) for detailed pin assignments. Common connections include:
- Power: 3V3 (Power Supply), GND (Ground)
- UART Communication: TX0 (Transmit), RX0 (Receive)
- SPI Communication: MOSI (Master Out Slave In), MISO (Master In Slave Out), CLK (Clock), CS (Chip Select)
- I2C Communication: SCL (Clock), SDA (Data) - Note: Specific I2C pins may vary or be shared with other functions. Consult detailed documentation for exact I2C pin usage.
- Other Pins: DIO, SWCLK, P12, P19, P28, HOLD (functions may vary based on firmware/application)
Connect the module to your development board or system using the provided Dupont lines, ensuring correct pin matching for power and communication interfaces (UART, SPI, or I2C) as per your application requirements.
6. Operating Instructions
The HLK-LD8001 module operates by transmitting 79G millimeter waves and processing the reflected signals to determine liquid or material levels. Data is typically output via a serial protocol.
6.1. Data Acquisition
Once powered and correctly connected, the module will begin detecting levels. The processed data, such as ranging information, is transmitted through the selected communication interface (UART, SPI, or I2C). You will need to implement a host controller (e.g., microcontroller, PC with a serial adapter) to read and interpret this data according to the module's serial protocol.
6.2. Detection Angle
The module has a detection angle of 100° horizontally and 80° in tilt. Ensure the module is positioned correctly relative to the liquid or material surface to be measured to optimize detection accuracy and range.
7. Maintenance
The HLK-LD8001 module is designed for robust operation. To ensure its longevity and optimal performance:
- Keep the module clean and free from dust and debris.
- Avoid exposing the module to extreme temperatures or humidity outside its specified operating range (-20°C to 85°C).
- Ensure proper ventilation if operating in an enclosed space.
- Handle the module with care to prevent physical damage to the PCB or antenna.
8. Troubleshooting
8.1. No Serial Data Output Communication
If you are not receiving data from the module via the serial interface:
- Check Power Supply: Verify that the module is receiving the correct voltage (3.3V) and that the power supply is stable.
- Inspect Connections: Ensure all Dupont lines are securely connected to the correct pins on both the module and your host controller. Pay close attention to TX/RX, MOSI/MISO/CLK/CS, or SCL/SDA lines.
- Verify Communication Settings: Confirm that the baud rate, data bits, parity, and stop bits on your host controller match the module's expected serial communication settings.
- Module Status: Check if the module is powered on and appears to be functioning (e.g., any indicator LEDs if present).
- Firmware/Software: Ensure your host controller's software or firmware is correctly configured to initialize and read data from the module according to its protocol.
8.2. Inaccurate Readings
- Obstructions: Ensure there are no physical obstructions between the module's antenna and the target surface.
- Mounting Angle: Verify the module is mounted at an appropriate angle, considering its horizontal (100°) and tilt (80°) beam angles.
- Environmental Factors: While robust, extreme conditions or specific materials might affect performance. Ensure the environment is within reasonable limits.
9. User Tips
- Start with the Test Kit: If available, begin by using the HLK-LD8001 Test Kit to familiarize yourself with the module's basic functionality and communication protocols before integrating it into a custom system.
- Double-Check Wiring: A common issue is incorrect wiring. Always refer to the pinout diagrams and verify each connection before powering on.
- Consult Documentation: For advanced configurations or specific communication protocols, refer to the official Hi-Link documentation or datasheets for the ADT3102 chip.
10. Warranty and Support
For warranty information, technical support, or further inquiries, please contact your vendor or Hi-Link directly. Ensure you have your product model and purchase details ready for efficient assistance.
