Million dollar baby: Making millions selling open source hardware.

It will actually work on all the bikes I've seen, it just requires a flexible mount like double sticky tape vs something that clips or literally bolts on. I'm sure as I encounter more bikes I'll start to throw in little mounting tricks like Velcro straps or spacers.

That's a good idea - I've thought about putting smart phones on the ankle but not stopped to think that the pocket is sufficient.

Now, that said, it's hardly simple to get that signal off (via bluetooth I assume) across several platforms and read into a micro controller.

But I like that kind of problem more than I like the mechanical engineering and design issues of the sensor ring, so I'll definitely give it a closer look. Thanks!

Exactly. I work in medical hw/sw and I can tell you the amount of bureucracy is insane and everything is orders of magnitude harder than any non-regulated business. Open Source itself is not really a problem, we use a lot of it (os, libs, etc.).

But those projects listed OpenEEG, the one for anesthesia, etc are targeted as medical devices (I think). Are they just operating under the radar?