[PATCH] Added support for parsing temperature in the dive header

[Jef Driesen]

On 2014-08-25 00:34, Artur Wroblewski wrote:
> On Sun, Aug 24, 2014 at 11:02 PM, Jef Driesen <jef at libdivecomputer.org> 
> wrote:
> [...]
>> The temperature  sensors in  most dive computers  are very  slow and
>> need a significant amount of time  (in the order of several minutes)
>> to adapt to changing temperatures.
> 
> Does anyone have different experience?

I can only confirm :-)

You can clearly notice this effect when diving in water with a 
significant difference in temperature. When you drop below a 
thermocline, you immediately feel the difference in temperature, but a 
takes a while before the dive computer does catch up. If you download 
the dive afterwards and check the depth and temperature profiles, you'll 
clearly see the drop in the temperature curve comes significantly after 
the drop in depth.

Some dive computers might be doing a bit better than others here, but I 
have certainly noticed this effect with all the ones I have used myself.

> Any datasheet of pressure sensor
> used in a dive computer, which would prove above wrong?

Most, if not all dive computers, will likely use a Intersema MS5541C 
sensor (or another variant).

http://www.meas-spec.com/product/t_product.aspx?id=5035

(Well I don't have any hard facts to proof that claim, because with the 
exception of Heinrichs Weikamp no other manufacturer publishes which 
sensor they use, but I would be really surprised if I'm wrong.)

> Also, any publication in the context of temperature, which would claim 
> that
> anything beside cold dive (minimum temperature) matters?

Matter in the sense of affecting decompression, or in the context of 
logbook applications? I don't have or know any scientific publications 
about the first one, and the latter is mainly personal preference.

Jef