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Y Axis for accel/gyro in docs is wrong and as printed on the sticker on the case. Magnometer Z axis is down #2

@ifrew

Description

@ifrew

Describe the bug

I noticed that when I opened up the case, on the pcb, the silkscreen showed the axis for the acceleration and gyro. The y axis was in the opposite direction to the sticker and in the docs that showed Y pointing North, X East and Z Up. After running getsensordat.ino sketch and looking at the values as I rotated the device in all 3 axis I can confirm that the Y axis is actually pointing South. Similarly for the gyro. For the magnometer, the Y axis is South, X is East and Z is down. This is assuming the rotation of the axis as shown in the docs. I use the device for navigation and the madgewick algorithm requires the axis to be correct.

To reproduce

Run getsnesordata.ino and look at the values for accelerometer, gyro and magnometer

Expected behavior

Update docs to show correct orientation

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