Barometer Connections

For the UDB4 and UDB5, configure the barometer for 3.3 volts, and connect the ground, VCC, SCL, and SDA lines on the magnetometer to the GND, 3.3, SCL, and SDA pins on the UDB4 or UDB5.

For the Auav3, you're done! The Auav3 has a BMP180 barometer ready to go.