[dorkbotpdx-blabber] Making a stationary racing machine

[Dread Pirate Kermit]

On Wed, Jun 18, 2008 at 10:22 PM, dan p <gunterhausfrau at gmail.com> wrote:
> sure, lots.
>
> a typical bike computer uses a magnet and a "sensor" I believe usually a
> coil and counts the number of times the magnet passes the coil (pulses from
> the coil, magnet on the wheel).

I think they typically use a Hall effect sensor, but close enough.
Whenever the magnet passes the sensor, a pulse get's sent to the
'brain'. X pulses/sec = Y MPH. Most modern motorcycle spedometers work
almost exactally the same.

-- 
Ken Morton
IBR '03, '07 IBA 257
'03 Aprilia Tuono "Bunny" '06 Suzuki DRZ400SM "Chunky"