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4525DO sensor

Plane supports the use of an airspeed sensor, which can help in windy condition, slow flight and autonomous landings. It is not recommended for most new users, however, as it does require additional tuning and adds one more layer of control to set up.
The digital differential airspeed sensor has a very low offset, a high resolution and, best of all, does not suffer from the noise induced by long cables. Featuring a Measurement Specialties 4525DO sensor, with 1 psi measurement range (roughly up to 100 m/s or 360 km/h or 223 mp/h), the Airspeed Sensor Kit enables a resolution of 0.84 Pa, with data delivered at 14 bits from a 24 bit delta-sigma ADC.
The sensor kit is sold without the pitot tube.
You can find more information on this page.

HARDWARE

The following sections show how to wire sensors to the flight controller. Connect the airspeed sensor to Pixhawk's I2C port \(or I2C splitter module\). Using the rubber tubing, connect the longer extension on the pitot tube to the cone that protrudes from the top of the airspeed sensor board \(off the off-white, square section protruding off the top of the board\), and connect the shorter extension on the pitot tube to the cone protruding from the base of the board. When you place the airspeed sensor in your aircraft, use the pitot tube set in the kit \(the kit comes with a single tube to measure both static and total pressure\). Make sure the holes in the side of the tube are not covered. They should be at least 1 centimeter out past the nose. First, connect the two tubes coming out the back to the airspeed sensor. The tube coming straight out the back should go into the top port and the tube exiting at an angle should connect to the bottom port on the airspeed sensor. Drill or cut a small hole in the foam and push it through to the front. If you are using Plane in an aircraft with the propeller in the nose, the pitot tube must be mounted out on one wing, at least a foot away from the fuselage to be outside the prop flow.

SOFTWARE (PX4 with QGC)

No configuration is required under QgroundControl for the use of this sensor.
To display in QgroundControl the value read by the sensor, click:
QGC px4 drotek
The widget on the right allows you to view the data from the various sensors on your Pixhawk 3 Pro.
To view the data of interest, click on:
QGC px4 pixhawk
Check the Air Speed setting. You can choose the size of the display by checking Large.
Confirm by clicking on OK.