[libdivecomputer] #9: Add support for temperature and tank pressure on Mares Nemo Air

Libdivecomputer Bug Tracking System trac at libdivecomputer.org
Tue Aug 19 04:49:06 PDT 2014

#9: Add support for temperature and tank pressure on Mares Nemo Air
Reporter:  bbremer                   |                                                 Owner:
    Type:  enhancement               |  jefdriesen
Priority:  major                     |                                                Status:
 Version:  0.4                       |  accepted
Keywords:                            |                                             Component:
                                     |  Dive parsing
                                     |                                            Resolution:
                                     |  Plattform (please give specifics in
                                     |  the ticket text):  All
Changes (by jefdriesen):

 * status:  reopened => accepted



 I think you are right. I forgot that the Nemo Air uses 5 bytes per sample
 instead of 2. Those extra 3 bytes may indeed contain tank pressure data.

 Initial investigation shows that one of those bytes contains the gas
 consumption (in l/min) for each sample. That's most likely the value used
 to plot the graph you attached. So far I have not been able to find the
 tank pressure per sample, only the begin/end values. I could find the
 values corresponding to the <tankpressure> elements in the uddf. But if I
 treat those as delta values, then the pressure drops too fast, and I end
 up with negative pressures. That's certainly not correct.

Ticket URL: <http://trac.libdivecomputer.org/ticket/9#comment:3>
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a cross-platform and open source library for communication with dive computers from various manufacturers

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