Hi Linus, I just realized the same, none of my code changes do anything to the events but I am working on a patch to detect pressure drops that happen if you decouple the regulator before the uemis has finished its dive which is usually 2-3 minutes after you surface.
If you have done some fixes already please let me know so we do not duplicate efforts. If you haven't it's a good learning for me but will take some time as I don't know that part of the code yet. G. Lerch Montag, 28. September 2015 04:17 +0200 von Linus Torvalds <[email protected]>: >On Mon, Sep 21, 2015 at 3:30 PM, Guido Lerch < [email protected] > wrote: >< >> Has someone recently changed something to the equipment info. >> Reading a dive from my Uemis today the first time since I test the end >> pressure in the equipment info is wrong. > >I just got the same thing, and my SAC rate was hugely worse than it >should be, because the end pressure for the dive was recorded as 1.94 >bar, even though the *display* shows 108.05 bar. Small difference >between tank half full, and tank at ambient pressure. > >And it turns out that the pressure reading of 1.94 bar is actually >technically correct, it's just that the Uemis downloader seems to have >changed. The end of that dive looks like this: > > ... > 57:44 2.67m 109.68bar > 57:47 2.67m 109.57bar > 57:52 2.58m 109.48bar > 58:00 2.56m 109.38bar > 58:03 2.33m 109.24bar > 58:08 2.37m 109.16bar > 58:16 2.16m 109.05bar > 58:19 1.89m 108.96bar > 58:24 2.09m 108.88bar > 58:27 2.13m > 58:32 1.95m 108.78bar > 58:40 1.57m 108.58bar > 58:43 1.48m 108.49bar > 58:48 0.0m > ... > 60:56 0.0m 108.0bar > 60:59 0.0m 29.5°C 108.02bar > 61:04 0.0m 108.03bar > 61:06 0.0m 29.4°C > 61:12 0.0m 29.5°C > 61:20 0.0m 108.05bar > 61:23 0.0m > 61:28 0.0m 108.06bar cns=4% > 61:36 0.0m > 61:39 0.0m > 61:44 0.0m > 61:47 0.0m > 61:52 0.0m 56.11bar > 62:00 0.0m 29.06bar > 62:02 0.0m 1.94bar > 62:08 0.0m > 62:14 0.0m > >ie I came to the *surface with 108 bar, but then a couple of minutes >later I turned off my air and depressurized the regulator. The Uemis >has helpfully saved all of that, and while we don't *display* the >surface events at the end, the "end pressure" calculations and the SAC >calculations do actually see it. > >I *think* the old Uemis downloader used to just ignore pressure events >at the surface, because I don't recall having seen this before. So I >suspect it's actually your Uemis changes that caused this. > >At the same time, I think we should just ignore the pressure data from >the surface. It's not meaningful, regardless of whether you >depressurize the regulator or not, since you'd presumably be breathing >the surface air, not from the cylinder. So surface time shouldn't >count towards the SAC, and likewise is meaningless for "end pressure" >as exemplified above. > >So I'll fix the generic code, and we can let the Uemis downloader be. > > Linus
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