Airspeed Sensors

Airspeed sensors are highly recommended for fixed-wing and VTOL frames. They are so important because the autopilot does not have other means to detect stall. For fixed-wing flight it is the airspeed that guarantees lift not ground speed!

Hardware Options

Recommended digital airspeed sensors include:

• MEAS Spec series (e.g. MS4525DO, MS5525)
  • mRo I2C Airspeed Sensor JST-GH MS4525DO (mRo store)
  • Digital Differential Airspeed Sensor Kit (Drotek).
• EagleTree Airspeed MicroSensor V3 (eagletreesystems)
• Sensirion SDP3X Differential Pressure Sensor
• Holybro Digital Air Speed Sensor

All the above sensors are connected via the I2C bus/port.

:::note Additionally, the Avionics Anonymous Air Data Computer can be connected to the UAVCAN bus to determine not only high-accuracy airspeed, but also true static pressure and air temperature via onboard barometer and an OAT probe. :::

Configuration

Enable Airspeed Sensors

Unlike most other sensor drivers, the airspeed sensor drivers are not automatically started.

Enable each type using its corresponding parameter:

• Sensirion SDP3X (SENS_EN_SDP3X)
• TE MS4525 (SENS_EN_MS4525)
• TE MS5525 (SENS_EN_MS5525)
• Eagle Tree airspeed sensor (SENS_EN_ETSASPD)

Calibration

Airspeed calibration information can be found in: Basic Configuration > Airspeed.

Developer Information

• Airspeed drivers (source code)