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-   -   sailfish onboard battery monitor (https://talk.maemo.org/showthread.php?t=92693)

bb_szx 2014-02-14 18:57
sailfish onboard battery monitor
 
hi,

since update to 1.0.3.8 i noticed follow:

sailfish logged by it self battery-states located in:

Code:
/var/lib/upower
Code:
[nemo@localhost upower]$ ls -al
total 192
drwxr-xr-x 1 root root  170 Feb 14 19:06 .
drwxr-xr-x 1 root root  434 Jan 10 22:53 ..
-rw-r--r-- 1 root root  3835 Feb 14 19:06 history-charge-7.dat
-rw-r--r-- 1 root root 96854 Feb 14 19:06 history-rate-7.dat
-rw-r--r-- 1 root root 61164 Feb 14 19:06 history-time-empty-7.dat
-rw-r--r-- 1 root root 29297 Feb 14 19:06 history-time-full-7.dat
Code:
[nemo@localhost upower]$ cat history-charge-7.dat
1391803697      64.646  discharging
1391830931      63.636  discharging
1391848331      62.626  discharging
1391861531      61.616  discharging
1391879532      60.606  discharging
1391887931      59.596  discharging
1391899332      58.586  discharging
1391908932      57.576  discharging
1391916732      56.566  discharging
1391925881      55.556  discharging
1391938333      54.545  discharging
1391940733      53.535  discharging
1391955132      52.525  discharging
1391971333      51.515  discharging
1391982733      50.505  discharging
1392009733      49.495  discharging
1392024733      48.485  discharging
1392033733      47.475  discharging
1392047533      46.465  discharging
1392056533      45.455  discharging
1392076933      44.444  discharging
1392097934      43.434  discharging
1392111734      42.424  discharging
1392127934      41.414  discharging
1392138134      40.404  discharging
1392140461      39.394  discharging
1392148240      38.384  discharging
1392148621      37.374  discharging
1392148973      36.364  discharging
1392149334      35.354  discharging
1392149965      34.343  discharging
1392188728      33.333  discharging
1392199334      32.323  discharging
1392211935      31.313  discharging
1392223935      30.303  discharging
1392230559      29.293  discharging
1392230677      28.283  discharging
1392233010      27.273  discharging
1392233382      26.263  discharging
1392233804      25.253  discharging
1392233814      24.242  discharging
1392233864      23.232  discharging
1392233994      22.222  discharging
1392234396      21.212  discharging
1392273135      20.202  discharging
1392283335      19.192  discharging
1392296866      18.182  discharging
1392307480      17.172  discharging
1392308144      16.162  discharging
1392308685      15.152  discharging
1392309127      14.141  discharging
1392309518      13.131  discharging
1392309907      12.121  discharging
1392310255      11.111  discharging
1392310480      10.101  discharging
1392310719      9.091  discharging
1392310829      10.101  charging
1392310980      11.111  charging
1392311130      12.121  charging
1392311281      13.131  charging
1392311431      14.141  charging
1392312562      0.000  unknown
1392312562      34.343  discharging
1392312631      35.354  charging
1392312711      36.364  charging
1392312792      37.374  charging
1392312872      38.384  charging
1392312952      39.394  charging
1392313033      40.404  charging
1392313113      41.414  charging
1392313203      42.424  charging
1392313284      43.434  charging
1392313364      44.444  charging
1392313444      45.455  charging
1392313525      46.465  charging
1392313605      47.475  charging
1392313685      48.485  charging
1392313766      49.495  charging
1392313846      50.505  charging
1392313936      51.515  charging
1392314017      52.525  charging
1392314097      53.535  charging
1392314177      54.545  charging
1392314258      55.556  charging
1392314338      56.566  charging
1392314418      57.576  charging
1392314499      58.586  charging
1392314589      59.596  charging
1392314669      60.606  charging
1392314750      61.616  charging
1392314830      62.626  charging
1392314910      63.636  charging
1392314991      64.646  charging
1392315081      65.657  charging
1392315161      66.667  charging
1392315242      67.677  charging
1392315322      68.687  charging
1392315402      69.697  charging
1392315493      70.707  charging
1392315573      71.717  charging
1392315653      72.727  charging
1392315734      73.737  charging
1392315814      74.747  charging
1392315904      75.758  charging
1392315985      76.768  charging
1392316065      77.778  charging
1392316155      78.788  charging
1392316236      79.798  charging
1392316316      80.808  charging
1392316406      81.818  charging
1392316487      82.828  charging
1392316567      83.838  charging
1392316657      84.848  charging
1392316738      85.859  charging
1392316818      86.869  charging
1392316908      87.879  charging
1392316999      88.889  charging
1392317079      89.899  charging
1392317169      90.909  charging
1392317260      91.919  charging
1392317350      92.929  charging
1392317450      93.939  charging
1392317541      94.949  charging
1392317641      95.960  charging
1392317742      96.970  charging
1392317832      97.980  charging
1392317932      98.990  charging
1392318043      100.000 charging
1392333137      99.000  discharging
1392340337      98.000  discharging
1392364938      97.000  discharging
1392380537      96.000  discharging
1392388938      95.000  discharging
1392400029      94.000  discharging
1392400981      93.000  discharging
and
Code:
/var/run/state/namespaces/Battery
is linked to
Code:
/var/run/state/providers/upower/Battery
Code:
[nemo@localhost Battery]$ ls -al
total 0
dr-xr-xr-x 9 root users 0 Feb 13 18:29 .
dr-xr-xr-x 3 root users 0 Feb 13 18:29 ..
-r--r----- 1 root users 2 Feb 13 18:29 Capacity
-r--r----- 1 root users 2 Feb 14 18:47 ChargePercentage
-r--r----- 1 root users 1 Feb 13 21:50 IsCharging
-r--r----- 1 root users 1 Feb 13 18:29 LowBattery
-r--r----- 1 root users 1 Feb 13 18:29 OnBattery
-r--r----- 1 root users 1 Feb 13 18:29 TimeUntilFull
-r--r----- 1 root users 5 Feb 13 18:29 TimeUntilLow
i think it's a good basic to code a better batterymonitor, or?

strahl 2014-02-15 23:04
Re: sailfish onboard battery monitor
 
Cool, thanks for the info! :) I quickly computed a median over my discharge rate using

Code:
grep discharging /var/lib/upower/history-rate-7.dat | sort -k2 | awk '{ a[i++]=$2; } END { print a[int(i/2)]; }'
My Jolla typically consumes 0.245 Watt being mainly connected to a WiFi and <10h a week via an UMTS data link and used quite a bit for reading news, emails, facebook... So the 7.98Wh battery (2100mAh * 3.8V) should typically last for 32.5h (1.4 days) which is a bit shorter than I observed (2.5 days).

:) stefan

PS: Computing the mean using the awk command below does bias short intervals with a high consumption too strongly (I get 0.448 Watt) and would suggest that my battery lasts for only 17.8h which is not the case.

Code:
awk '{ if ($3 =="discharging") sum += $2 } END { if (NR > 0) print sum / NR }' < /var/lib/upower/history-rate-7.dat
PPS: If you look for the smallest discharge rate you see 0.011 Watt in the history which would result in 725h (30 days) .

Code:
grep discharging /var/lib/upower/history-rate-7.dat | sort -k2 | head

psonek 2014-03-02 20:25
Re: sailfish onboard battery monitor
 
Hi,
you can check https://openrepos.net/content/radekp/battery-monitor for battery monitor application done by me.

It draws graph for charge_now values. Unfortunately the value refreshes quite seldom - so not very useful for short term measurements, but you will get pretty accurate graph e.g. if you manually refresh after a few hours.

Btw battery on my Jolla on 2G takes 7 days to discharge.

bb_szx 2014-03-10 19:29
Re: sailfish onboard battery monitor
 
can you code a second screen based by 'history-charge-7.dat'?
i'm not a developer, so i can't support you...

psonek 2014-03-11 09:41
Re: sailfish onboard battery monitor
 
Yes, it should be possible, but no promises - depends if i'll have time

bb_szx 2014-03-11 09:48
Re: sailfish onboard battery monitor
 
No hurry...

marius_emil1 2014-10-27 11:26
Re: sailfish onboard battery monitor
 
It seems that with Sailfish 1.1.0.39 the files from /var/lib/upower are missing!

marius_emil1 2014-10-27 11:50
Re: sailfish onboard battery monitor
 
In version 1.1.0.39 we can use files from:
/var/run/state/providers/upower/
and
/sys/class/power_supply/battery
(apparently there are the same files)


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