Chapter 13: Connecting and Configuring the Airspeed Sensor

This example uses a Fapple airspeed sensor with the MS4525D protocol. For installation on the airframe, refer to the airspeed sensor installation instructions and select a location that minimizes the effect of airframe turbulence. Connect the airspeed sensor 5V and GND pins to the flight controller 5V and GND pins to provide stable power. Connect the sensor SDA and SCL pins to the flight controller SDA and SCL pins respectively.

Search for the following parameters in the Full Parameter List and set them as shown:

ARSPD_TYPE 1

ARSPD_OPTION 15

ARSPD_AUTOCAL 1

ARSPD_SKIPCAL 1

On the OSD layout page, enable ASPD1, drag it to the desired position, and write the settings.

Checking Airspeed Sensor Operation

When the airspeed sensor is communicating correctly with the flight controller, its status is visible in the ground station as shown below.

Blow gently into the airspeed sensor dynamic-pressure port, or point it into airflow from a fan. Confirm that the airspeed value in the ground station changes, as shown below.

A basic calibration is required on the first flight with the airspeed sensor. After takeoff, switch to LOITER mode so the aircraft circles at its current altitude. Keep the aircraft circling for 5-10 minutes to allow the flight controller to calibrate the airspeed sensor automatically. After a normal landing, connect the ground station and disable automatic calibration by setting: ARSPD_AUTOCAL 2

The airspeed sensor configuration is now complete.

For additional settings, refer to the parameter information provided with the airspeed sensor.