Eagle Tree Systems Airspeed Sensor

The Eagle Tree Airspeed Sensor provides differential pressure output measurements in pascal via I2C and includes a simple LED display that display the maximum speed reached.

The user manual provides information on general usage as well as how to install it on your airframe.

3rd Party Mode is not required. The Eagle Tree Systems Airspeed sensor documentation states that you must switch to 3rd party mode for non Eagle Tree Systems use. This is not required and in fact will stop it working with the PX4 driver. The sensor is pretty much plug-n-play.

What you will need


  • white: GND
  • red: +5V
  • yellow: SDA
  • brown: SCL

You can choose to connect it to the DF13 15-pos connector on the PX4FMU board if you wish to use I2C1 or I2C2 or on the PX4IO port you can use the I2C3 DF13 4-pos port.

Manually Starting the Driver

nsh> ets_airspeed start

To check whether the app is running:

nsh> ets_airspeed status

To stop, use:

nsh> ets_airspeed stop

Once you have started the driver you can run the test and then gently blow directly into the pitot. You should see some non-zero values in the output. To run the tests run:

nsh> ets_airspeed test


–bus / -b

The default bus is bus 3 (I2C3).


Starting the app using an alternative bus, such as I2C1.

nsh> ets_airspeed start -b 1

Auto Starting the Driver

Add the following line to /etc/extras.txt on your microSD card:

ets_airspeed start
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