On Friday 03 July 2009, arne anka wrote: > >> 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 > > how?
The same as any other mechanical switch - operation becomes unreliable leading to inaccurate speed measurement, then fails completely. It doesn't happen quickly - it was on the second or third set of batteries so it would have been several years and thousands of miles. _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community