On Sat, Mar 6, 2010 at 10:10 AM, Karl Hammar <karl@aspodata.se> wrote:

Giso:
> Karl Hammar wrote:
... [pedalling up/downhill] ...

> > Well, then you need an accelerometer [1]. [2] is said to be in the
> > iPhone, but you probably want something easier to solder.
> >
> > With it you could get the inclination angle and then get the applied
> > force. If you do it right you could even get a crashing sound when
> > falling...
>
> I would recommend the 'bowsense' from Notam/Hans Wilmers:
>
> http://lad.linuxaudio.org/events/2009_cdm/Friday/12_Wilmers/index.html

Fun project that also, but note, with Bluetoth they need long time to start
the connection. And they don't explain in [3], page 18, why they add
epsilon * a to the gravity estimater.

> It can measure the acceleration (including gravitation) vector in 3D,
> and can transmit it at a rate of 100 or 200 Hz via bluetooth to your PC.
> There you can transform it into OSC messages to control your synth
> (together with the pedal rate). And the included gyrometer might improve
> the the falling detection...

Isn't gyrometers a little expensive?

> > [1] http://en.wikipedia.org/wiki/Accelerometer
> > [2] http://www.st.com/stonline/products/literature/ds/12726/lis302dl.htm

[3] http://lad.linuxaudio.org/events/2009_cdm/Friday/12_Wilmers/bowsense-lac2009-slides.pdf

Regards,
/Karl

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Karl Hammar Aspö Data karl@aspodata.se
Lilla Aspö 148 Networks
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