1. Product Overview
The HLK-LD2415H is a high-precision millimeter wave radar module designed for vehicle speed measurement. It integrates a microstrip antenna, radio frequency circuit, and signal processing circuit to directly output target speed information. This module is capable of long-distance car speed detection, up to 180 meters or more, and features an integrated radio frequency chip for high frequency stability and a speed measurement accuracy of 1 KM/h.
2. Key Features
- K-band radio frequency integrated circuit design.
- Frequency range: 24.125GHz (customizable frequency).
- Modulation method: CW (Continuous Wave) for detecting moving vehicles.
- Detection distance: ≥180 meters.
- Supports RS485 interface and TTL serial port (baud rate 9600bps).
- Speed measurement range: 1 KM/h to 240 KM/h.
- Speed measurement error: Less than ±1 KM/h (when the angle between movement direction and radar beam azimuth is zero degrees).
- Operating Voltage: 9V to 24V.
- Operating Current: ≤50mA @ 12V.
- Output Power (EIRP): 20dBm.
- Actual Power Consumption: ≤1.2W.
- Antenna Angle: Horizontal 40°, Pitch 16° (3dB beam width, actual detection angle is greater than 4 lanes).
- Sensor Dimensions: 69mm (Length) x 53mm (Width) x 5mm (Height).
3. Setup and Installation
The HLK-LD2415H module requires proper electrical connection and mounting for optimal performance. Ensure the module is securely mounted in a location that provides a clear line of sight to the target area, considering the antenna angles for horizontal and vertical coverage.
3.1 Interface Description
The module features an 8-pin female connector (1.25mm pitch) for power and communication. Refer to the diagram below for pin assignments.
| Pin No. | Function | Description |
|---|---|---|
| 1 | PULSE | Pulse output interface. |
| 2 | AA | Auxiliary Analog output. |
| 3 | RX | Receive data (TTL serial port). |
| 4 | TX | Transmit data (TTL serial port). |
| 5 | B/RS485 | RS485 differential signal B. |
| 6 | A/RS485 | RS485 differential signal A. |
| 7 | GND | Ground. |
| 8 | VCC | Power supply input (9V-24V). |
3.2 Power Supply
Connect the VCC pin (Pin 8) to a stable power source within the 9V to 24V DC range. Connect the GND pin (Pin 7) to the power supply ground. Ensure the power supply can provide at least 50mA at 12V.
3.3 Communication Interface
The module supports both TTL serial communication and RS485. Choose the appropriate interface based on your application requirements.
- TTL Serial Port: Use RX (Pin 3) and TX (Pin 4) for communication with a microcontroller or other serial devices. The default baud rate is 9600bps.
- RS485: Use A/RS485 (Pin 6) and B/RS485 (Pin 5) for robust long-distance communication in industrial environments.
4. Operating Instructions
Once powered and connected, the HLK-LD2415H module will begin detecting moving vehicles within its detection range and antenna angle. The module outputs speed information directly via its serial communication interfaces.
4.1 Speed Measurement
- The module detects speeds from 1 KM/h to 240 KM/h.
- For optimal accuracy (error less than ±1 KM/h), ensure the radar beam is aligned as closely as possible to the direction of vehicle movement (zero degrees angle).
- The detection distance is up to 180 meters.
4.2 Data Output
The speed data is transmitted through the configured serial port (TTL or RS485) at a baud rate of 9600bps. Refer to the module's communication protocol documentation (not provided here, typically found in a detailed datasheet) for specific data formats and commands to interpret the speed information.
5. Maintenance
The HLK-LD2415H module is designed for robust operation with minimal maintenance. To ensure longevity and reliable performance:
- Environmental Protection: Keep the module dry and protect it from excessive dust, moisture, and corrosive environments.
- Temperature: Operate and store the module within the specified temperature ranges (-20°C to +85°C for operation, -40°C to +125°C for storage).
- Cleaning: If necessary, gently clean the module's surface with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Physical Damage: Avoid physical shock or impact to the module, as this can damage internal components or the antenna.
6. Troubleshooting
If you encounter issues with the HLK-LD2415H module, consider the following:
- No Power:
- Verify that the power supply voltage is within the 9V-24V range and is stable.
- Check all power connections (VCC and GND) for proper contact and polarity.
- No Speed Data Output:
- Ensure the communication interface (TTL or RS485) is correctly wired.
- Confirm that the serial communication parameters (e.g., baud rate 9600bps) on your receiving device match the module's settings.
- Check for any obstructions in the radar's line of sight to the target.
- Verify that there are actual moving targets within the detection range and antenna angle.
- Inaccurate Speed Readings:
- Ensure the module is mounted such that the radar beam is as parallel as possible to the direction of vehicle movement to minimize angular error.
- Check for environmental factors that might interfere with radar signals (e.g., heavy rain, dense fog, large metallic objects near the module).
If problems persist, consult the detailed technical documentation (datasheet) for the HLK-LD2415H module or contact Hi-Link technical support.
7. Specifications
Detailed technical specifications for the HLK-LD2415H module are provided below:
| Parameter | Symbol | Min. Value | Typical Value | Max. Value | Unit | Explanation |
|---|---|---|---|---|---|---|
| Transmitter | ||||||
| Transmission frequency | f | 24.075 | 24.125 | 24.175 | GHz | Customizable |
| Output Power (EIRP) | Pout | 18 | 20 | dBm | Customizable | |
| Antenna Angle | ||||||
| Transmitting antenna gain | 16 | dBi | ||||
| Receive antenna gain | 18.4 | dBi | ||||
| Transmitting antenna radiation angle | ±20 | deg | Level | |||
| Receive antenna radiation angle | ±8 | deg | Vertical | |||
| Power Supply | ||||||
| Operating voltage | VCC | 9 | 12 | 24 | V | |
| Operating current | ICC | 50 | mA | @12V | ||
| Interface parameters | ||||||
| Pulse interface | VCC | 9 | 12 | 24 | V | |
| Environment | ||||||
| Operating temperature | TOP | -20 | +85 | °C | ||
| Storage temperature | TOP | -40 | +125 | °C | ||
| Dimensions | 69 x 53 x 5 | mm | Length x Width x Height | |||
8. User Tips
Based on general usage of similar radar modules, here are some tips for optimizing performance:
- Clear Line of Sight: Ensure no physical obstructions are in front of the radar module that could block or reflect the microwave signals, leading to inaccurate readings.
- Mounting Angle: For precise speed measurements, mount the module such that the radar beam is as parallel as possible to the expected direction of movement of the target. Any angle will introduce a cosine error, where the measured speed will be lower than the actual speed.
- Power Stability: Use a stable and clean power supply to avoid noise interference that could affect the module's performance and data output.
- Serial Communication Testing: When setting up, use a serial monitor or terminal program to verify that data is being received correctly from the module before integrating it into a larger system.
No specific user tips were available from provided buyer reviews or Q&A content.
9. Warranty and Support
For warranty information, please refer to the terms and conditions provided by your point of purchase or contact the seller directly. Hi-Link, the manufacturer, typically provides support for their products.
For technical assistance or further inquiries, please contact Hi-Link customer support or the authorized distributor from whom you purchased the module. Ensure you have your product model (HLK-LD2415H) and any relevant purchase details available when seeking support.
