Butterworth, 2nd order, 0.1Hz cutoff, 71Hz sampling

Zoë with 2nd order, 0.1Hz cut-off and 71Hz sampling butterworth IIR filter from Andy Baker on Vimeo.

Currently the code which calculates the Butterworth coefficients and implements the filter only covers 2nd order – I need to do some more reading / understanding to go higher.  I suspect 4th order at 0.2Hz might be better.  Cut-off and sampling frequencies are already configurable.

The accelerating drift to the right suggests calibration errors rather than a take-off problem which normally leads to a fixed velocity drift. Calibration cube out again, I think.

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