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.

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)