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I want my computer to play a custom sound file when my battery is low (say 10%). How can I do this? Thanks

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2 Answers 2

You can set up a cron job which will check for battery status after every 5/10 min and then depending on the battery percentage it will play some sound.

To play the sound you can use

mpg123 filename.mp3

To install it

sudo apt-get install mpg123

To get battery status from command line you can use this command

upower -i /org/freedesktop/UPower/devices/battery_BAT0

using grep you can extract the exact info as follows

upower -i /org/freedesktop/UPower/devices/battery_BAT0| grep -E "state|to\ full|percentage"

Now you can put all these things in a shell script (and also an if condition to check if battery status is lower than 10%) and just give path of this shell script to cron job.

so after every 5 mins (You can change this interval) your battery status will be checked and if battery is lower than 10% your provided sound file will be played!

Hope this helps!

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Thats right, only the cool people use mpg123 :) –  Scott Goodgame May 23 '14 at 3:01

One easy way to do this is to add a simple check to your crontab (cron is a system to run things on a regular, user-defined basis in the background.)

First you need to install a command line mp3 player and acpi to be able to read battery state.

From a terminal run the following to install the packages.

sudo apt-get install acpi mpg123

Next,while still in the terminal, type crontab -e and enter the following to the end of the file. Just change the user to your user name and the .mp3 to your filename in your home directory.

*5 * * * * if [ `acpi |awk '{print substr($NF, 0, length($NF)-1)}'`  -lt "10" ] ; then mpg123 /home/user/SuperCoolSound.mp3   ;fi

Hit Control-O (the letter) and Enter to save. Hit Control-x to exit

Extra stuff you might want to read...

Ubuntu CronHowto

Ubuntu Guide

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