solarwind wrote:
> The most complex part about this is going to be the detection of RPM.
>
> One option is to use a reed switch mounted near the spokes and a
> magnet mounted on the spoke itself.

A reed switch is not a good choice.  This is usually done with a permanent
magnet between two spokes of the back wheel as far radially outward as
possible and a pickup coil on the frame.  A little analog electronics and
you get a pulse into the PIC once per wheel rotation.


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