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From Bryce Curtis <curtis.br...@gmail.com>
Subject Re: Normalization of acceleration values
Date Fri, 16 Mar 2012 02:41:46 GMT
+1

On Thu, Mar 15, 2012 at 6:43 PM, Filip Maj <fil@adobe.com> wrote:

> Hey all,
>
> I'm bringing this one back up :)
>
> https://issues.apache.org/jira/browse/CB-152
>
>
> I am leaning towards going with the spec Jesse linked to [1] and having
> all the platforms roll with units expressed as m/s^2.
>
> From a conversation I just had with Jesse this issue just came up in WP7
> as well.
>
> I will do some testing on my iPod + android and see what the different
> return values are currently. I'll try to consolidate. We will have to
> update docs for this as well!
>
> [1] http://dev.w3.org/geo/api/spec-source-orientation.html#devicemotion
>
> On 2/8/12 3:54 PM, "Brian LeRoux" <b@brian.io> wrote:
>
> >rather than a vote thread I'm thinking we continue to treat W3C
> >recommendation 'the right way' to do stuff
> >
> >(I realize that in itself is debatable!!!)
> >
> >On Tue, Feb 7, 2012 at 7:48 AM, Simon MacDonald
> ><simon.macdonald@gmail.com> wrote:
> >> It seems to be on Android that it is returning the value in m/s*s. When
> >>my
> >> device is resting on the desk the x and y values are close to 0 while
> >>the z
> >> is close to 9.8. Depending on what Android device you have your
> >> accelerometer may be more accurate or able to go up to a higher level
> >>of g.
> >> So, it looks like if we want to standardize on g as the unit to be
> >>returned
> >> for the accelerometer I'll need to divide by 9.81.
> >>
> >> Also, can someone else run the MobileSpec code and go into Accelerometer
> >> and do a Start Watch while leaving your phone flat on the desk? I want
> >>to
> >> make sure that other devices don't correct for gravity as I only have
> >> Samsung devices here.
> >>
> >> Simon Mac Donald
> >> http://hi.im/simonmacdonald
> >>
> >>
> >> On Tue, Feb 7, 2012 at 3:36 AM, Filip Maj <fil@adobe.com> wrote:
> >>
> >>> Let's decide, please. A vote thread?
> >>>
> >>> My vote is using what the W3C spec [1] suggests, which, as Jesse points
> >>> out in the JIRA issue, seems to be m/s^2.
> >>>
> >>> My problem looking at this a few weeks ago was figuring out what the
> >>> reference point/units on the various native platforms was (I.e. What is
> >>> -10 / +10 on Android? What is -1000 / +1000 on Blackberry? What are
> >>>those
> >>> units?). It's not very well documented :s
> >>>
> >>> On 12-02-07 3:00 AM, "gtanner@gmail.com" <gtanner@gmail.com> wrote:
> >>>
> >>> >Also to note that I think the values on BlackBerry are -1000 to +1000.
> >>> >
> >>> >Dan was noticing this last week while working on an app
> >>> >------Original Message------
> >>> >From: Shazron
> >>> >To: callback-dev@incubator.apache.org
> >>> >ReplyTo: callback-dev@incubator.apache.org
> >>> >Subject: Normalization of acceleration values
> >>> >Sent: Feb 6, 2012 8:57 PM
> >>> >
> >>> >https://issues.apache.org/jira/browse/CB-152
> >>> >
> >>> >Should we decide?
> >>> >
> >>> >Sent on the TELUS Mobility network with BlackBerry
> >>>
> >>>
>
>

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