--------- Forwarded message ----------
From: Gabriel Ambuehl <[EMAIL PROTECTED]>
To: community@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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