I was examining the specs of a breakout board.

It says in there that,

Integrate 10 dof sensors

Adxl345 accelerometer

ITG3200 gyro

HMC5883L Compass

BMP280 pressure sensor

Why is it called as a 10 DOF sensor? In past I was dealing with some IMUs consisting of an accelerometer + a gyroscope and they were called as 6 DOF sensors. Which was a little bit more understandable, I was thinking that 3 measurements from accel and 3 from gyro = 6 degrees of freedom. However in the above case, I am not sure.

  • 1
    \$\begingroup\$ 3-axis gyro + 3-axis accelerometer + 3-axis compass + 1 pressure = 10. \$\endgroup\$
    – Eugene Sh.
    Commented Nov 19, 2019 at 21:34

1 Answer 1


In this context, DOF (degrees of freedom) just mean the number of independent parameters.

Here it is 10:

accelerometer = 3 (acceleration in three dimensions)
gyro = 3 (rate of rotation around three axes)
compass = 3 (magnetic field in three dimensions)
pressure = 1 (well... pressure)

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