1. Introduction
The Radiolink SU04 is a compact and high-performance ultrasonic sensor designed for precise distance measurement and obstacle avoidance. It is a transmitting and receiving hybrid sensor, ideal for integration into various unmanned systems such as helicopters, multirotors, airplanes, cars, and boats. The SU04 provides reliable obstacle detection and altitude holding capabilities, enhancing the safety and autonomy of your devices.
Figure 1: Radiolink SU04 Ultrasonic Sensor module.
2. Key Features
- Obstacle Avoidance: Enables autonomous obstacle avoidance in 8 horizontal directions, upward obstacle avoidance, and downward altitude hold for various platforms.
- Compact and Multifunctional: Single probe design, weighing only 0.017Lb (approximately 8 grams) with dimensions of 0.78 x 0.86 x 0.75 inches, making it easy to install.
- Versatile Applications: Suitable for agriculture, training, and rescue operations, compatible with helicopters, multirotors, airplanes, cars, and boats.
- High Accuracy and Low Latency: Supports 0.4cm detection accuracy and offers an extreme fast response time as low as 30ms.
- Broad Compatibility: Compatible with Radiolink flight controllers such as PIXHAWK, MINPIX, and TURBO PIX, automatically identifying I2C and UART (MAVlink protocol).
3. Package Contents
The SU04 package typically includes the following components:
- SU04 Ultrasonic Sensor Module
- Packing bag
- PIXHAWK (I2C slot) cable
- Wire for Mini Pix (I2C)
- Mini Pix (I2C slot)/I2C cable
- Wire for PIXHAWK (TELEM1 & 2)
Figure 2: Contents of the SU04 package.
4. Technical Specifications
| Specification | Value |
|---|---|
| Brand | Radiolink |
| Model Name | SU04 |
| Item Dimensions (L x W x H) | 0.78 x 0.75 x 0.86 inches |
| Item Weight | 8 Grams (0.017 Lb) |
| Material | Plastic |
| Current Rating | 18 Milliamps |
| Maximum Supply Voltage | 5.5 Volts |
| Measurement Accuracy | 0.4 cm |
| Measuring Range | 40cm to 450cm |
| Mounting Type | Flange Mount |
| Output Type | Digital |
| Response Time | 30 Milliseconds |
| Sensing Distance | 450 Centimeters |
| Specific Uses For Product | Agriculture, Training, Rescue |
5. Setup and Installation
Proper installation of the SU04 sensor is crucial for optimal performance. Ensure the sensor is mounted securely and has a clear line of sight for ultrasonic wave emission and reception.
5.1. Compatibility
The SU04 ultrasonic sensor is designed to be compatible with various flight controllers, including Radiolink's PIXHAWK, MINPIX, and TURBO PIX. It automatically identifies I2C and UART (MAVlink protocol) connections.
Figure 3: SU04 compatibility with various flight controllers.
5.2. Wiring Diagram
Connect the SU04 sensor to your flight controller using the appropriate cables provided. The sensor supports both I2C and UART (MAVlink protocol) interfaces. Refer to your flight controller's manual for specific port locations.
Figure 4: Example wiring diagram for SU04 with a flight controller, showing I2C and UART connections.
6. Operating Principles
The SU04 ultrasonic sensor operates by emitting ultrasonic sound waves and measuring the time it takes for these waves to reflect off an object and return to the sensor. This "time-of-flight" measurement is then used to calculate the distance to the object.
6.1. Response Time and Accuracy
The SU04 boasts an extreme fast response time of 30ms, allowing for rapid detection of obstacles. It offers a high detection accuracy of 0.4cm, ensuring even small obstacles are precisely identified.
Figure 5: Illustration of ultrasonic wave transmission and reception, highlighting the 30ms response time.
The sensor features a 60° beam angle, enabling comprehensive synchronous avoidance. This wide beam ensures a larger detection area, improving the overall obstacle avoidance capability of the system.
Figure 6: Depiction of the 60° beam angle for high precision and synchronous avoidance.
6.2. Detection Range and Autonomous Avoidance
The SU04 has a measuring range of 40cm to 450cm. This range allows for effective obstacle detection and autonomous avoidance, providing a safety buffer for your device in various environments.
Figure 7: Illustration of autonomous obstacle avoidance with the SU04 sensor, showing detection range in multiple directions.
7. Maintenance
To ensure the longevity and optimal performance of your Radiolink SU04 ultrasonic sensor, follow these simple maintenance guidelines:
- Keep Clean: Regularly inspect the sensor's surface for dust, dirt, or debris. Gently clean the transducer surface with a soft, dry cloth. Avoid using abrasive materials or harsh chemicals.
- Check Connections: Periodically verify that all wiring connections to the flight controller are secure and free from corrosion or damage.
- Avoid Physical Damage: Protect the sensor from impacts or excessive vibrations, which can affect its calibration and performance.
- Storage: When not in use for extended periods, store the sensor in a dry, cool environment, away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you encounter issues with your SU04 ultrasonic sensor, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Sensor not detected by flight controller. | Incorrect wiring; Loose connection; Flight controller not configured for sensor. | Verify wiring according to the diagram; Ensure cables are securely connected; Check flight controller firmware and configuration settings for ultrasonic sensor support. |
| Inaccurate distance readings. | Sensor surface obstructed; Interference from other sensors/noise; Environmental factors (e.g., strong wind, soft surfaces absorbing sound). | Clean the sensor surface; Ensure no objects are blocking the sensor's path; Test in a controlled environment; Adjust sensor mounting to minimize interference. |
| Intermittent operation. | Poor power supply; Damaged cable; Software glitch. | Check power supply voltage (ensure it's within 5.5V); Replace cables if suspected damaged; Restart flight controller and sensor. |
| No obstacle avoidance functionality. | Feature not enabled in flight controller software; Sensor not providing data. | Confirm obstacle avoidance is enabled and configured in your flight controller's software (e.g., Mission Planner, QGroundControl); Refer to flight controller documentation. |
9. Warranty and Support
9.1. Warranty Information
Radiolink products are manufactured to high quality standards. This product comes with a standard manufacturer's warranty against defects in materials and workmanship. Please retain your proof of purchase for warranty claims. For specific warranty terms and conditions, refer to the official Radiolink website or contact their customer service.
9.2. Customer Support
For technical assistance, troubleshooting, or any inquiries regarding your Radiolink SU04 Ultrasonic Sensor, please contact Radiolink customer support through their official website or the contact information provided with your product. You can also visit the Radiolink Store on Amazon for more information and resources.
