[dorkbotpdx-blabber] Making a stationary racing machine

[Trystan Cobbett]

I'll have a look at the arduino, thanks, that might be just the ticket  
since it looks like it can be programmed on a mac?


On Jun 18, 2008, at 10:22 PM, dan p 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). 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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