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Digital Airspeed Sensor ASPD-4525
Brand: Matek
Product Code: ASPD-4525
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Digital Airspeed Sensor ASPD-4525
Description
1. Product Overview
1.1. Product Description
The Matek ASPD-4525 Digital Airspeed Sensor is a compact, high-accuracy module used for measuring airspeed in RC fixed-wing aircraft, UAVs, and autopilot systems. It uses the MS4525DO differential pressure sensor and provides reliable data through an I²C interface, making it compatible with popular flight controllers such as ArduPilot and PX4. The ASPD-4525 is ideal for pilots who need precise and stable airspeed readings during flight.
1.2. Key Features
- Based on MS4525DO differential pressure sensor for high precision.
- Digital I²C output for compatibility with modern flight controllers.
- Operating voltage: 4.0 – 5.5 V DC.
- Low power consumption: approximately 5 mA.
- Pressure range: ~1 PSI (≈ 6.89 kPa), maximum 20 PSI (≈ 137.9 kPa).
- Measurement accuracy: ±0.25% span.
- Operating temperature: -40°C to +125°C.
- Compact and lightweight: ~3.5 g.
- Includes pitot tube, clear silicone tubing, and JST-GH cable (depending on kit).
- Ideal for autopilot-based airspeed and TECS (Total Energy Control System) operations.
2. Technical Specifications
Table 2-1. ASPD-4525 Sensor Specifications
| Parameter | Specification |
|---|---|
| Model | ASPD-4525 |
| Sensor Type | MS4525DO Differential Pressure Sensor |
| Interface | I²C (SCL, SDA) |
| Input Voltage | 4.0 – 5.5 V DC |
| Current Consumption | ≈ 5 mA |
| Pressure Range | 1 PSI (~6.89 kPa) |
| Maximum Pressure | 20 PSI (~137.9 kPa) |
| Accuracy | ±0.25% span |
| Operating Temperature | -40°C to +125°C |
| Dimensions | Small PCB module |
| Weight | ≈ 3.5 g |
| Compatibility | ArduPilot, PX4, and I²C-based autopilots |
| Included Accessories | Pitot tube, tubing, JST-GH cable (varies by kit) |
3. Applications
- Fixed-Wing UAVs: Provides accurate airspeed data for flight control systems.
- Autopilot Systems: Works with ArduPilot or PX4 for TECS and stall protection.
- VTOL and Hybrid Drones: Enables energy management and speed monitoring.
- Research & Development: Suitable for aerodynamic experiments and airflow studies.
4. Setup & Integration
- Connect the sensor to the I²C port on the flight controller (SDA, SCL, 5V, GND).
- Set
ARSPD_TYPE = 1or corresponding configuration in ArduPilot parameters. - Connect the pitot tube properly: pressure side to “+”, static side to “–”.
- Ensure clean and dry air tubes for accurate readings.
- Perform calibration before first flight using ground reference conditions.
- Verify consistent airspeed readings in telemetry before takeoff.
5. Benefits
- Accurate and stable airspeed measurement for reliable flight performance.
- Lightweight and easy to integrate into most flight controllers.
- Digital I²C output for noise-free and precise data transmission.
- Wide operating temperature range suitable for outdoor UAV applications.
6. Limitations & Notes
- Proper pitot tube alignment and calibration are crucial for accuracy.
- Some users report higher noise levels compared to premium sensors.
- Check I²C wiring and ensure correct voltage levels to prevent communication loss.
- Do not exceed the specified pressure range to avoid sensor damage.
7. Practical Summary
The Matek ASPD-4525 Digital Airspeed Sensor is a reliable and cost-effective solution for digital airspeed measurement in UAVs and fixed-wing models. Featuring an MS4525DO pressure sensor and I²C interface, it delivers precise real-time data for flight control systems like ArduPilot and PX4. Compact, efficient, and easy to install, it is ideal for hobbyists and professionals seeking dependable airspeed feedback for safe and optimized flight performance.
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