Turn FR into bike meter

[Paul Fertser]

Cameron Frazier <frazier.cameron at gmail.com> writes:
>> 1) I'm missing the cadence display = the number of revolutions of the
>> crank per minute; roughly speaking, this is the speed at which a
>> cyclist is pedalling/turning the pedals.
>
> For cadence detection, a hall effect sensor and a small magnet would
> cover it and have no moving parts/contacts ( see [1] for an
> example),

Hm, i was always under the impression that most bike systems use a
simple magnet and a reed switch (no need for hall effect sensor) for
both cadence and speed measurements. So any sensor from a regular
"bike computer" can be directly attached to the mic line of FR.

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