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[APP] [1.0] CPUStatusLED (Charging LED as CPU status indicator) [Gingerbread too]

2,750 posts
Thanks Meter: 290
By britoso, Senior Member on 19th June 2010, 07:20 AM
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What is this:
An app that uses the charging LED to show the current CPU load.
Source is up here

Video (outdated now):

Here are the colors, and the default order in which they are used: (colors may vary depending on the device)
The order of colors and threshold is configurable.
<3     -  Off
3-15   -  blue
16-40  -  green
41-75  -  amber
>=76   -  red
Works On: Should work on all. Root is needed for some models.
The logcat will tell you which LEDs were found and if root is needed.

Download the apk and install it. The app runs as a service in the background.
On Froyo you can email it to your gmail address, Gmail will show you an "install" option.

adb install -r CPUStatusLED.apk


Todos, & Known 'bugs'
  • The Red LED does not stay lit on the N1, It always blinks by design.

-Props to Bernhard.R.Suter creator of NetMeter, on which this was built upon. [project page]
-The awesome aChartEngine graphing API.

It is now (4/13/11) on the Market:
If you cannot access the market, get it from the project site:
The signing key may have changed, so if you have any errors updating please uninstall the old first.
Remove NetMeter+LED or NetmeterPlus before installing CPUStatusLED or they will both set the LEDs and cause confusion.
Last edited by britoso; 11th October 2011 at 06:28 AM.
19th June 2010, 07:31 AM |#2  
G1-evolve's Avatar
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Installed, nice work!
19th June 2010, 11:39 AM |#3  
rori~'s Avatar
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wow,nice work!!!!!
19th June 2010, 11:46 AM |#4  
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Interesting stuff.. source plz?)
19th June 2010, 12:01 PM |#5  
commodoor's Avatar
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Wow really nice one

Maybe if you can post a movie clip to show the working of it?
19th June 2010, 03:42 PM |#6  
britoso's Avatar
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Originally Posted by commodoor

Maybe if you can post a movie clip to show the working of it?

Added an existing video from the other thread, it shows the LED blinking. Just imagine that the blinking is off and there are 5 states (off>blue>green>amber(orange)>red). Updated OP.
19th June 2010, 03:49 PM |#7  
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Will give it a try if you fix the red LED

Edit // Well, I tried it and it seems to work but it always auto closes my AppDrawer and makes the Homescreens buggy.. uninstalled since I can't use it like that :\
Last edited by pzumk; 19th June 2010 at 03:56 PM.
19th June 2010, 03:53 PM |#8  
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Originally Posted by xPatriicK

Will give it a try if you fix the red LED

That will involve fixing code in /system/lib/hw/
A binary patch wont do it, needs to be rebuilt.


QCT MSM7K lights Module, Google, Inc.

Interesting, only the RED LED has a frequency file associated with it. Cant find the files for "grpfreq" and "grppwm" (power status colors?) though
RED_FREQ_FILE -> /sys/class/leds/red/device/grpfreq
RED_PWM_FILE -> /sys/class/leds/red/device/grppwm
# pwd

# ls -l
ls -l
-rw-r--r-- root     root         4096 2010-06-19 10:04 uevent
lrwxrwxrwx root     root              2010-06-19 10:04 subsystem -> ../../../../../class/leds
lrwxrwxrwx root     root              2010-06-19 10:03 device -> ../../../0-0066
-rw-r--r-- system   system       4096 2010-06-19 10:04 brightness
-rw-r--r-- root     root         4096 2010-06-19 10:04 max_brightness
-rw-r--r-- root     root         4096 2010-06-19 10:04 trigger
drwxr-xr-x root     root              2010-06-19 10:04 power
-rw-r--r-- system   system       4096 2010-06-18 06:20 blink
-rw-r--r-- root     root         4096 2010-06-19 10:04 off_timer

# cd /
cd /
# find . -name "grpfreq"
find . -name "grpfreq"
(no results)
Last edited by britoso; 19th June 2010 at 04:12 PM.
19th June 2010, 04:08 PM |#9  
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great work , mate !!!!!!!
19th June 2010, 04:13 PM |#10  
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Great idea. I'll hold off until the source is available and some more progress has been made but it's a fantastic start
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