[dorkbotpdx-blabber] Making a stationary racing machine

[dan p]

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). Seems a simple thing to hook to an arduino
(see the class that is coming up) a digital input to measure the number of
times the sensor picks up the magnet going by, then pulse width modulate a
meter, or use analog output to drive a clock. Seems like it could be pretty
straightforward.

If the "clock" used a stepper (or modified servo) you could drive it fairly
simply.

Now if you wanted to do the whole thing analog, it seems to be not that much
more complicated, but out of my comfort zone (others on this list should
find it simple).

but check out the arduino, the class that is coming up will be very helpful
and it does simplefy lots of things.






On 6/18/08, Trystan Cobbett <trystan.cobbett at rapha.cc> wrote:
>
> I'm essentially making a big electric clock. It measures how many time
> around a bicycle wheel travels and simulates distance so 1 full revolution
> of the clock's hand equals 500 meters.
>
> This isn't any thing that revolutionary, people have made these using drive
> cables like a car's speedo or I've seen a few that just have projectors. I
> want this machine to be as analog as possible with a big clock face but with
> magnetic sensors and motors moving the hands of the clock.
> This is also not that revolutionary, I'm copying the work of a Seattle
> based company that made one just for fun last year. They're not too
> interested in making another one but they've copied me all the info
> including the layout of their circuit boards and all the part numbers for
> every piece I should need.
>
> The only real trouble is that I have no idea what I'm doing. I can make a
> bicycle from raw steel tubing into a machine, but when it comes to circuits
> and electricity I'm at a loss.
>
> The company gave me the circuit board layout in a pdf but the company I
> approached said they need it in Gerber something.... A friend suggested that
> some people on this forum might be smarter than I am in terms of pulling
> something like this together, and that their might be an alternative to the
> conventional circuit boards which I'm trying to get made.
>
> Anyone out there got some ideas?
>
> Bikegeek99
>
>
>
>
>
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