Compass Calibration

for the complete list of supported compas , please read the magnetometer page

Instalation

Position your magnetometer as far away from power wires as possible. Try to shield those wires, to minimize the electromagnetic interferences they generate.

explain how to position the mag

Calibration

Press the calib_mag button in your multiwii gui to start the calibration.

For the next 30 sec while your status led is flashing, rotating the copter around all axes is what you have to do.

1. Rotate 360 degree around yaw axis for x, y calibration.
2. Rotate 360 degree around pitch axis for y z calibration.
3. Rotate 360 degree around roll for x z calibration.

Advanced Calibration

Press the calib_mag button in your multiwii gui to start the calibration.

For the next 30 sec while your status led is flashing, rotating the copter around all axes is what you have to do.

1. Point to the north 3d in your zone (for europe point north and down, it is near 45 degree down to earth. Watch your GUI.)
2. Rotate 360 degree around yaw axis for x, y calibration.
3. Rotate 360 degree around pitch axis for y z calibration.
4. Point multicopter west.
5. Rotate 360 degree around roll for x z calibration.

For further informations about this method, have a look at this threat -> http://www.multiwii.com/forum/viewtopic.php?f=8&t=1387&p=10658

Magnetic declination

In order to get accurate data from your magnetometer, you have to set the magnetic declination for your country. Keep in mind, this value may change after a few months from calculation.

For further information have a look at http://www.multiwii.com/forum/viewtopic.php?f=17&t=3178&p=35911&hilit=mag+declination+calculate&sid=dd3c20739e2913326d6827cb42ccdfbf#p35911

Compass Sensor Direction

How should be the sensor axis directions:

TILT the MULTI to the RIGHT (left side up): - MAG_ROLL goes up - MAG_Z goes down

TILT the MULTI forward (tail up): - MAG_PITCH goes up - MAG_Z goes down

The copter stays level: - MAG_Z is positive