I wrote

> 0x28 (approx, for a 10-bit ADC) change in ADC result, which
> fits in a nybble

Oh no it doesn't (unless you count 1/2 a 16-bit byte as a nybble)

But you hopefully got my point. Organise the data so you save
enough, preferably the minimum, information needed to preserve
it, whether that's raw readings or the differences

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