FFT Harmonic Notch Filters - and IMU selection

ArduCopter Copter 4.5
1

I’m setting up FFT for the first time in a couple of years. I’m using a CubePilot Orange+ flight controller.

The FFT parameters allow selecting any combination of the three IMU’s - IMU-0, IMU-1, and IMU-2.

Assuming the flight controller has enough memory and processing power, should I select all three IMU’s?

Also - I recall that on the original Cube Orange, there was a service bulletin that stated that a parameter be set to begin operation with the second IMU - as there was some issue with the first IMU.

Is this still the case? And as I recall, the Orange+ flight controller doesn’t have this problem.

Do I recall these details correctly?

And if I’m using a flight controller that has the problematic IMU - should it be included in the FFT selection for IMU?

2

You remember correctly. Presumably you mean batch logging? Yes on all IMUs is helpful, although to save log bandwidth you could just do the primary.

3

Thank you Andy.

On the Cube Orange with the problematic 1st IMU - should it be excluded from the FFT logging?