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2009-01-12
, 20:19
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Posts: 4,274 |
Thanked: 5,358 times |
Joined on Sep 2007
@ Looking at y'all and sighing
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#12
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Originally Posted by BrentDC
http://mrrau.dyndns.org:23280/n800/kcbatt/
Is it possible to read the raw battery level (direct from the hardware)?
I'm thinking of an application that reads battery level every minute and adds it to a max 120 line log in /tmp/. The application then weights the readings slightly more toward present, to compute a more accurate reading (that would survive a reboot).
Possible?
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2009-01-12
, 20:56
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Posts: 903 |
Thanked: 632 times |
Joined on Apr 2008
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#13
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Originally Posted by qwerty12
Hmm, looking at the source, there is no algorithm for estimated battery level, just a linear return value.
http://mrrau.dyndns.org:23280/n800/kcbatt/
That is cool though, it at least seems to draw the data directly from the hardware (the "retu", I think).
My C/C++ skills are very weak, but maybe I can modify the source and add some sort of algorithm to more accurately predict battery level. Or maybe not
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2009-01-12
, 20:59
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Posts: 1,224 |
Thanked: 1,763 times |
Joined on Jul 2007
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#14
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I also wrote a simple program: See retu-adc.c (or retu-adc for the binary) here:http://my.arava.co.il/~matan/770/
Run retu-adc to read all ADCs, or retu-adc 8 9 to read the battery voltage only.
To get a reasonable battery level, you need to take into account the temperature, charging status, and current draw, if it is also available somehow.
Run retu-adc to read all ADCs, or retu-adc 8 9 to read the battery voltage only.
To get a reasonable battery level, you need to take into account the temperature, charging status, and current draw, if it is also available somehow.
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2009-01-12
, 21:09
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Posts: 1,224 |
Thanked: 1,763 times |
Joined on Jul 2007
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#15
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Originally Posted by BrentDC
If you come up with a good algorithm, I am sure someone will be able to implement it in whatever language.
My C/C++ skills are very weak, but maybe I can modify the source and add some sort of algorithm to more accurately predict battery level. Or maybe not
To find such an algorithm I suggest log values from full battery to empty on a few usage profiles:
- low power draw: standby, not connected
- medium power draw: low CPU usage, screen on low brightness.
- high power draw: play a movie that takes 100% cpu in a loop over WiFi with maximum brightness and GPS on.
Try to find an algorithm that fits all those logs.
Just a small note: /tmp will not survive a reboot, it is on tmpfs.
| The Following User Says Thank You to Matan For This Useful Post: | ||
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2009-01-12
, 21:39
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Posts: 903 |
Thanked: 632 times |
Joined on Apr 2008
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#16
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Matan, I'm a little confused. When I run your program, I just get this:
Is this expected?
Code:
~/scripts $ ./retu-adc 0: ffffffff 1: ffffffff 2: ffffffff 3: ffffffff 4: ffffffff 5: ffffffff 6: ffffffff 7: ffffffff 8: ffffffff 9: ffffffff 10: ffffffff 11: ffffffff 12: ffffffff 13: ffffffff 14: ffffffff 15: ffffffff
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2009-01-12
, 22:41
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Posts: 903 |
Thanked: 632 times |
Joined on Apr 2008
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#18
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Matan, could you please change the output of retu-adc to decimal instead of hex?
I would do it myself, but, again, my C skills are lacking
I would do it myself, but, again, my C skills are lacking
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2009-01-12
, 22:54
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Posts: 4,930 |
Thanked: 2,272 times |
Joined on Oct 2007
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#19
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Originally Posted by BrentDC
Change this:
Matan, could you please change the output of retu-adc to decimal instead of hex?
I would do it myself, but, again, my C skills are lacking
Code:
for(i=s;i<e;i++) {
printf("%d: %08x ", i, ioctl(f,RETU_IOCH_ADC_READ, i));
if((i&3)==3)printf("\n");
}
Code:
for(i=s;i<e;i++) {
printf("%d: %010d ", i, ioctl(f,RETU_IOCH_ADC_READ, i));
if((i&3)==3)printf("\n");
}
__________________
World's first inductively-charged N900!
World's first inductively-charged N900!
| The Following User Says Thank You to Benson For This Useful Post: | ||
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2009-01-12
, 22:55
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Posts: 1,224 |
Thanked: 1,763 times |
Joined on Jul 2007
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#20
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| The Following User Says Thank You to Matan For This Useful Post: | ||
I recently had an issue where i thought there was a firmware problem with the battery level. it turned out to be a bad battery (mine was 13 months old)