Pd and Arduino with bluetooth would be my first choice for ease. PD can synthesize and sample and connects to arduino with few hassles.<br><br>t<br><br><br><div class="gmail_quote">On Fri, Mar 5, 2010 at 11:19 AM, Rick Green <span dir="ltr"><<a href="mailto:rtg@aapsc.com">rtg@aapsc.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">On Thu, 4 Mar 2010, Folderol wrote:<br>
<br>
> Also, use a short range photocell on the spokes (say 50mm). Easy to<br>
> mount, reliable results with minimal effort. As these can usually<br>
> respond up to 10-30kHz you won't have to worry about pedalling too<br>
> fast :)<br>
<br>
</div> Sensing the spokes measures vehicle speed, not pedaling speed, you'd want<br>
your synth to drop to idle while you're coasting. I'm for a photocell<br>
watching the crank sprocket teeth in the rear interval where there's no<br>
chain.<br>
You also need to measure torque, or chain tension, to drive your synth's<br>
volume. An idler with a load cell on the top of the chain between the<br>
crank and the wheel can be used for a single-speed or three-speed in-hub<br>
transmission, but if you have a rear derailleur, you'll need another fixed<br>
idler between the sensor and the rear wheel. If you have a front<br>
derailleur as well, it just gets too complicated...<br>
Maybe the accelerometer is simpler after all, even if you have to<br>
compensate for incline. That's just math, not hardware.<br>
<div class="im"><br>
--<br>
Rick Green<br>
<br>
"Those who would give up essential Liberty, to purchase a little<br>
temporary Safety, deserve neither Liberty nor Safety."<br>
-Benjamin Franklin<br>
<br>
"As for our common defense, we reject as false the choice between our<br>
safety and our ideals."<br>
-President Barack Obama 20 Jan 2009<br>
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