Matek Digital Airspeed Sensor ASPD-4525

Specifications

• Board Supply voltage: 4~5.5V DC
• Sensor: TE  4525DO-DS5AI001DP
• Working current: 5mA
• Output: I2C (SCL & SDA)
• Pressure Ranges: 1 PSI (6.89kPa)
• Maximum Pressure: 20 PSI (137.9kPa)
• Operating Temperature: -40°C ~ 125°C
• Accuracy: ±0.25% SPAN
• Red LED:  power indicator
• JST-GH sequence: 5V, SCL, SDA, GND
• Weight: 3.5g (sensor board)

Including

• 1x ASPD-4525 Sensor Board.
• 1x JST-GH-4P to JST-GH-4P 20cm silicon wire
• Pitot Tube.
• Clear silicon tubing  40cm

Wiring

• 5V to FC 4~5.5V
• SCL to FC I2C_SCL
• SDA to FC I2C_SDA
• G to FC GND

Tips

• You can check the airspeed reading with Mission Planner or INAV configurator. Just blow on the pitot tube or press your finger over it and observe the response. In still air oscillation between zero and small values (2-3/s) is normal.
• The airspeed varies with the square root of the pressure, so for differential pressures near zero it varies quite a bit with very small pressure changes, while at flying speeds it takes much greater pressure changes to produce a similar change in speed.
• If you see mostly 0~2m/s, with an occasional bounce to 3~4m/s, consider it normal. You will not see that sort of variability at flying speeds.