[dorkbotpdx-blabber] bike clock

[Trystan Cobbett]

I think you got it pretty much exactly; it's to measure distance 500  
meters, it uses a magnetic sensor which sends a pulse signal to the  
circuit board, the circuit board then records a number of pulses and  
sends a new signal to a stepper motor. The stepper motor has 200  
movements in one rotation. Then a gear ratio of 9 into 48 so the  
circuit board needs to convert the number of pulses from the roller  
(not the wheel but the roller that it sits on) to something like 10  
pulses to one movement of the stepper motor which is then reduced by  
the gear ratio.
Most of the challenging parts are solved by the geniuses that made the  
first one, the part that I'm mostly mystified by is creating the  
circuit boards and programming them. I have a working prototype to  
model and I have a pdf of the circuit board plus the program written  
for that board. Unfortunately I don't know exactly what it all means,  
in terms of a language which I can understand.
I need to build the functional circuit boards and program them with  
the written formula that has already been developed.
It seems simple enough but finding someone that can work up the boards  
with me has been tough.


On Jun 18, 2008, at 9:22 PM, tim kochanski wrote:

> I built a bike computer with an old pda, some magets and a serial  
> port from radioshack.  do you want the clock to count seconds as  
> RPM's or do you want the ol' skool clock to count seconds as Km or  
> miles?  You could have the magets send a pulse to a device that  
> counts clicks then turns on power to the clock at approapriate  
> intervals.  the math part is just arithematic.  getting all the  
> mechanical doo-dads picked out would likely be the tough part.  you  
> could prolly program an arduino for such a task.  then it's just an  
> arithematic programming problem.  I am imagining pulses of  
> electricity to the clock to advance it at intervals appropriate to  
> your distance traveled.  Sounds interesting for sure.
>
> Tim
>
> --------------------->
> Tim Kochanski
> Systems-Science/Economics Ph.D. Program
> Portland State University
> 1721 SW Broadway, Suite 241
> Portland, OR 97201
> cell: (503) 928-0187
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