Please have a look at the "accelerometer data retrieval" wiki page at
http://wiki.openmoko.org/wiki/Accelerometer_data_retrieval .
It is said that "the Z axis is pointing from the display downwards to to the
back of the openmoko". In my opinion this is false and all other axes
my be inverted as we
> So, the fact that when idle the accelerometers report a positive Z value
> implies that the Z axe is actually upward.
>
> Agree ?
Yes I think that's right. If you hold the Freerunner that any arrow of an axis
points to the earth middlepoint then the sown value must be negative.
Michael
_
Michael Tansella writes:
>> So, the fact that when idle the accelerometers report a positive Z value
>> implies that the Z axe is actually upward.
>>
>> Agree ?
>
> Yes I think that's right. If you hold the Freerunner that any arrow of an
> axis
> points to the earth middlepoint then the sown va
Paul Fertser writes:
?> Michael Tansella writes:
>>> So, the fact that when idle the accelerometers report a positive Z value
>>> implies that the Z axe is actually upward.
>>>
>>> Agree ?
>>
>> Yes I think that's right. If you hold the Freerunner that any arrow of an
>> axis
>> points to the e
-[ Wed, Apr 08, 2009 at 04:32:41PM +0400, Paul Fertser ]
> I beg to disagree. If you are talking about acceleration of the sensor
> itself then you'll see that: 1. it's not actually accelerating if you
> attach a reference frame to the Earth (the freerunner is laying
> still). 2. The gravitati
>> > I beg to disagree. If you are talking about acceleration of the sensor
>> > itself then you'll see that: 1. it's not actually accelerating if you
>> > attach a reference frame to the Earth (the freerunner is laying
>> > still). 2. The gravitational force applied to the sensor is directed
>>
-[ Wed, Apr 08, 2009 at 04:26:02PM +0200, giacomo giotti mariani ]
> If you accelerate upwards your phone (with the screen pointing up) with
> an acceleration a you see a greater acceleration a_tot (along the z
> direction) that is the sum of gravity acceleration g and your imposed
> accelerat
On Wed, Apr 08, 2009 at 06:10:03PM +0200, ri...@happyleptic.org wrote:
> -[ Wed, Apr 08, 2009 at 04:26:02PM +0200, giacomo giotti mariani ]
> > If you accelerate upwards your phone (with the screen pointing up) with
> > an acceleration a you see a greater acceleration a_tot (along the z
> > di
Le 14342ième jour après Epoch,
ri...@happyleptic.org écrivait:
> Well, some confusion here.
Yes, probably because of mixing gravity, force, acceleration, inertia,
etc... :)
> OK, let's imagine a _perfect_ accelerometer.
> This device would report only acceleration. So, when the phone lies on the
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