Internal pressure sensor
baruch at ev-en.org
Thu Oct 1 09:03:19 CEST 2009
Jeff Sadowski wrote:
> 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:
>>> 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:
>>> Sourcecode is available from http://gitorious.org/freerunner-navigation-
>> 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.
> Bring extra charged batteries? What do others do for backpacking
> trips. Seems all cellphones eat batteries and aren't smart enough to
> stop searching for a signal when there is none.
In shr-settings you can set the GSM to off and conserve batteries this way.
When GSM is on the normal approach is to want a cell coverage if there
is any so near-constant searching is logical. It is possible to create a
auto-conserving mode which turns the GSM on and let it work for some
time and if there is no serving cell around turn it off for some period
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