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From Drew Walters <deedu...@gmail.com>
Subject Re: Normalization of acceleration values
Date Fri, 16 Mar 2012 17:54:33 GMT
FYI, my experience with BlackBerry is that it appears to be based on
gravity multiplied by 100.  So at rest my Torch 9800 (OS 6) reads

x=27(noise), y=4(noise), z=988

On Fri, Mar 16, 2012 at 12:08 PM, Filip Maj <fil@adobe.com> wrote:
> Laying devices flat on a table, with the screen pointed up, values were:
>
> Android 4.0.2 (Galaxy Nexus): x=0, y=0, z=9.8
> iPod 5.0.1: x=0, y=0.5 (wtf?), z=-1
>
> As a result, in my cordova-js integration branch for iOS, I've added a "g"
> constant at -9.81 and multiplied the return values from native by that.
> This lines up Android and iOS.
>
> Not sure what to make of the "at rest" value for y in the iPod, though...
>
> On 3/15/12 7:58 PM, "Dan Silivestru" <dan.silivestru@gmail.com> wrote:
>
>>+1 as well.
>>
>>I'll look into the values returned for the BlackBerry. At first glance
>>they
>>seem to be 2 orders of magnitude greater then g. I'll post back to the
>>group once I have the answer.
>>
>>On Thu, Mar 15, 2012 at 10:47 PM, Joe Bowser <bowserj@gmail.com> wrote:
>>
>>> +1
>>> On Mar 15, 2012 7:42 PM, "Bryce Curtis" <curtis.bryce@gmail.com> wrote:
>>>
>>> > +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
>>> > > >>>
>>> > > >>>
>>> > >
>>> > >
>>> >
>>>
>>
>>
>>
>>--
>>Dan Silivestru
>>+1 (519) 589-3624
>

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