<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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. <div><div>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. <br><div>I need to build the functional circuit boards and program them with the written formula that has already been developed. </div><div>It seems simple enough but finding someone that can work up the boards with me has been tough. </div><div><br></div><div><br><div><div>On Jun 18, 2008, at 9:22 PM, tim kochanski wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font: inherit;">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. <br><br>Tim<br><br>---------------------&gt;<br>Tim Kochanski<br>Systems-Science/Economics Ph.D. Program<br>Portland State University<br>1721 SW Broadway, Suite 241 <br>Portland, OR 97201 <br>cell: (503) 928-0187<br>---------------------&gt;<br><a href="http://www.geocities.com/monster_economist/forward.htm">http://www.geocities.com/monster_economist/forward.htm</a></td></tr></tbody></table><br> <br><br> <font style="BACKGROUND-COLOR: #ffffff"><p align="center"><font style="BACKGROUND-COLOR: #ffffff">Click <a href="https://www.mailcontrol.com/sr/k7tHDkRffG7TndxI!oX7Uky9+yGszOfNVIV++vIjiSMmqPjLqIqGqyKWkVk4iWwAFafgtoXuSZdTHufDF4Ashw==">here</a> to report this email as spam.</font></p></font> _______________________________________________<br>dorkbotpdx-blabber mailing list<br><a href="mailto:dorkbotpdx-blabber@dorkbot.org">dorkbotpdx-blabber@dorkbot.org</a><br>http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber</blockquote></div><br></div></div></div></body></html>