MPU-9½50 compass

Just for the record, I’ve finally found out why my first attempt to access the compass had failed; it’s not part of the MPU-9½50 slave I2C bus directly, but is attached as a slave to the MPU-9½50 master I2C bus as slave0.  Thus it’s configured via the MPU-9½50 slave0 I2C bus registers, and then the data is read by my code from the MPU-9½50 slave0 I2C registers that the MPU-9½50 supports.

There’s a couple of bits of code here and here for Arduino usage which probably give me enough useful information for me to try it out with.

I’ll probably tackle that next once I’ve got the first phase of the camera motion working well enough to demonstrate which could well be later today.

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