Barometers

Barometers measure atmospheric pressure, and are used in drones as altitude sensors.

Most flight controller hardware on which PX4 incudes a barometer. By default PX4 will select the barometer with the highest priority (if any are present), and configure it as a data source for Height estimation. If a sensor fault is detected, PX4 will fall back to the next highest priority sensor.

Generally barometers require no user configuration (or thought)!

Hardware Options

Pixhawk standard flight controllers include a barometer, as do many others.

They are also present in other hardware:

• CUAV NEO 3 Pro GNSS module (opens new window) (MS5611)

The supported baro part numbers can be inferred from the driver names, which are listed in PX4-Autopilot/src/drivers/barometer (opens new window) and from the Modules Reference: Baro (Driver) documentation. At time of writing, drivers/parts include: bmp280, bmp388 (and BMP380), dps310, goertek (spl06), invensense (icp10100, icp10111, icp101xx, icp201xx), lps22hb, lps25h, lps33hw, maiertek (mpc2520), mpl3115a2, ms5611, ms5837, tcbp001ta

PX4 Configuration

Generally barometers require no user configuration. If needed, you can:

• Enable/Disable barometers as data source for Height estimation using the EKF2_BARO_CTRL parameter.
• Change the selection order of barometers using the CAL_BAROx_PRIO parameters for each baro.
• Disable a baro by setting its CAL_BAROx_PRIO value to 0.

Calibration

Barometers don't require calibration.

Developer Information

• Baro driver source code (opens new window)
• Modules Reference: Baro (Driver) documentation.