g-sensor calibration problem
John Lee
john_lee at openmoko.com
Fri Jun 20 11:40:40 CEST 2008
On Fri, Jun 20, 2008 at 11:32:39AM +0200, Carl-Daniel Hailfinger wrote:
> Hi,
>
> On 20.06.2008 11:02, John Lee wrote:
> > Hi,
> >
> > If I use the enclosed python code to test g-sensor on gta02 (read
> > /dev/input/event3) while holding the neo vertically, normally the
> > result looks like this:
> >
> > x = -72, y = -990, t = 1.976891 pi
> > x = -72, y = -990, t = 1.976891 pi
> > x = -54, y = -990, t = 1.982655 pi <=======================
> > x = -72, y = -990, t = 1.976891 pi
> > x = -72, y = -990, t = 1.976891 pi
> >
> > It's quite reasonable. However,
> >
> > * sometimes after booting
> > * always after resume (apm -s)
> >
> > the result will look like this:
> >
> > x = 1620, y = -36, t = 0.492928 pi
> > x = 1620, y = -18, t = 0.496463 pi <=======================
> > x = 1620, y = -36, t = 0.492928 pi
> > x = 1620, y = -36, t = 0.492928 pi
> > x = 1620, y = -36, t = 0.492928 pi
> >
> > I wonder what's the cause? Any more information I could provide?
> >
>
> I can't help you with your direct problem, but the deviations I marked
> look similar to the touchscreen deviations. John, can you give us a
> longer line of measurements with the neo lying flat on a table?
> Andy?
flat on table
normal result
x = 36, y = -18, t = 0.352416 pi
x = 36, y = -36, t = 0.250000 pi
x = 36, y = -36, t = 0.250000 pi
x = 36, y = -18, t = 0.352416 pi
x = 36, y = -36, t = 0.250000 pi
x = 18, y = -36, t = 0.147584 pi
x = 36, y = -36, t = 0.250000 pi
x = 36, y = -18, t = 0.352416 pi
x = 36, y = -18, t = 0.352416 pi
x = 36, y = -36, t = 0.250000 pi
abnormal:
x = 1620, y = -36, t = 0.492928 pi
x = 1620, y = -36, t = 0.492928 pi
x = 1620, y = -36, t = 0.492928 pi
x = 1620, y = -36, t = 0.492928 pi
x = 1620, y = -18, t = 0.496463 pi
x = 1620, y = -18, t = 0.496463 pi
x = 1620, y = -18, t = 0.496463 pi
x = 1620, y = -36, t = 0.492928 pi
x = 1620, y = -18, t = 0.496463 pi
x = 1620, y = -36, t = 0.492928 pi
- John
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