jim wrote:
> Put more magnets or whatever on the wheel so you increase the
> frequency at lower speeds.
> So for instance, instead of 1 magnet (trigger), have 4 or 6 or 8 or
> 10 or whatever.

How's that better than just increasing the prescaler, essentially clocking
the timer lower?  You still have all the same constraints.  At the high end
you need some minimum resolution.  For a fixed size timer, that dictates the
lowest frequency you can measure without wrapping.


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