You will need:
* MPU9250 module (pitch/roll/yaw)
* BMP280 module (altitude/pressure and temperature)
MPU9250
SPI/IIC 9-Axis Attitude Module Gyro + Accelerator + Magnetometer Sensor
Available at many ebay stores, 3-5 USD.

BMP280:
Available at many ebay stores, 1-3 USD.

Put them together:
GND <–> GND
VCC <–> VCC
SCL <–> SCL
SDA <–> SDA

And plug raspberry PI I2C ports:


End result for your testing should look at least like this:

Stratux will hook it up automatically:

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