idea for Neo 2nd generation: Accelerometer

[Steven Milburn]

>
> --------- Forwarded message ----------
> From: Gabriel Ambuehl <gabriel_ambuehl at buz.ch>
> To: community at lists.openmoko.org
> Date: Fri, 26 Jan 2007 19:13:49 +0100
> Subject: Re: idea for Neo 2nd generation: Accelerometer
> On Friday 26 January 2007 18:41:50 Tim Newsom wrote:
> > > yes, accelerometers measure acceleration. The first derivative of
> > > acceleration is velocity.
> > Ok Steve.  I grant you that the first derivative of acceleration is
> > velocity...
>
> I don't think so. The first derivative of VELOCITY is acceleration (i.e.
> integrate acceleration to get velocity as acceleration is the rate of
> change
> of velocity) if my high school physics doesn't totally fail me right now.
>
> This also means that if acceleration is zero, velocity simply is constant.
> And
> in order to have velocity >0 you must have encountered some acceleration
> at
> some point.
>
>

Wow, I can't believe I got that backwards, thanks for the correction.  Kind
of embarrassing considering I actually work on this stuff.  However, it
doesn't invalidate that you don't need any more information than the
accelerometer and a starting point in order to track velocity and position.
I'm going to go work on removing the foot I shoved so far into my mouth
earlier.

--Steve
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