Accelerometer, magnetometer & gyroscope calibration

[filhote99]

I did not know, the accelerometer's response has improved so much, so thanks for your answer.

[filhote99]

Hi Seb, your project is too nice, I am new in this and I bought one accelerometer a7260, and when I measured the analog outputs (with a7260 in horizontal position), I noticed that they are not equal to zero volts, is it because I did not do a previus calibration? I need to calibrate each new accelerometer? or have I other kind of problem? Thank you very much.

[SebMadgwickResearch]

The accelerometer axis output when horizontal is sin(angle to vertical) and is so very sensitive to angle errors. The output when vertical is cos() and so insensitive. Therefore you will better measure the axis bias by measuring +1g and -1g on the axis and calculating the ‘centre value’. Even “calibrated” MEMS devices (e.g. ST’s LSM303DL* range) change during [your] manufacture so calibration is almost always required.

[vovo4kaX]

Awesome device!