On Friday 03 July 2009, Paul Fertser wrote: > Cameron Frazier <[email protected]> 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.
They do, and they eventually fail, hence the "no moving parts/contacts" bit. Both will work, but hall effect should last longer. _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
