[dorkbotpdx-blabber] Making a stationary racing machine

dan p gunterhausfrau at gmail.com
Thu Jun 19 11:56:14 EDT 2008


get a bike computer. For a few bucks you get the sensor and the magnet all
ready to be put on a bike.

On 6/19/08, Trystan Cobbett <trystan.cobbett at rapha.cc> wrote:
>
> That's a good idea, I was wondering where I was going to find the magnetic
> sensor. I'll see if I can find a motorcycle set up.
>
> Trystan Cobbett
>
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> On Jun 19, 2008, at 8:05 AM, Dread Pirate Kermit wrote:
>
> 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"
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