Internal pressure sensor

[Christoph Mair]

Am Donnerstag 01 Oktober 2009 06:42:24 schrieben Sie:
> On Wed, Sep 30, 2009 at 4:18 PM, Mikhail Umorin <mikeumo at gmail.com> wrote:
> > On Wednesday 30 September 2009 16:18:51 Christoph Mair wrote:
> >> Hi,
> >>
> >> I successfully added a pressure sensor to my Freerunner. The BMP085 chip
> >> from Bosch Sensortec is a small (5x5x1.5mm) chip which includes a
> >> pressure and a temperature sensor. Power and I2C is enough to get it
> >> working. I glued it next to the BT antenna. The wiki page contains some
> >> pictures: http://wiki.openmoko.org/wiki/I2C_Pressure_Sensor
> >> Sourcecode is available from http://gitorious.org/freerunner-navigation-
> >> board/bmp085
> >>
> >> Christoph
> >>
> >> _______________________________________________
> >> Openmoko community mailing list
> >> community at lists.openmoko.org
> >> http://lists.openmoko.org/mailman/listinfo/community
> >
> > Cool!
> >
> > can be very helpful during mountain hiking (not that GPS does not help
> > already -- but it may not be always available)
> 
> I'm wondering how much battery it draws probably not much but for
> backing trips it might not be all that useful.
From the datasheet:
The sensor uses about 0.1µA in standby and 12µA for one sample per second. If 
you don't need the highest resolution this gets down to 3µA per sample per 
second and scales linear with the sample rate.

Regards,
  Christoph