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Scott C. MacCallum 2024-11-25 15:14:09 -05:00
parent d411d8b3b5
commit 3e36fb9979
1 changed files with 16 additions and 13 deletions
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battery-monitor.sh
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@ -2,10 +2,12 @@
# battery-monitor.sh
# This program lets the user know when the battery needs to be charged, and
# suspends the computer once a user defined minimum is reached. It has been
# tested to work on a Debian 12 GNU/Linux x86_64 default console
# installation. The installation of bc is required.
# Once a user defined minimum is reached, this program lets the user know
# when the battery needs to be charged and suspends the computer.
# This program has been verified to work on a Debian 12 GNU/Linux x86_64
# default console installation, but the installation of the bc program is
# required.
# Copyright (c) 2024, Scott C. MacCallum (scott@scm-guru.live).
@ -28,7 +30,7 @@
# Change this variable to the group that should be informed of a need to
# charge the battery. On GNU/Linux distributions users are often part of
# a group that is the same as their login name, which works well if you only
# want your user to be informed in the console.
# want your user to be informed on the console.
group="scm"
@ -42,6 +44,8 @@ if (( minutes == 0 )); then
exit 0
fi
# Calculate the state of the battery.
charge=$(cat /sys/class/power_supply/$battery/charge_now)
discharge=$(cat /sys/class/power_supply/$battery/current_now)
hours=$(echo "scale=2; $charge / $discharge" | bc -l)
@ -49,20 +53,19 @@ minutes=$(echo "scale=2; $hours * 60" | bc -l)
# Change the minimum variable to the minimum amount of minutes that a battery
# is estimated to have left before the group is informed to recharge it. When
# I tested this and the battery-suspend.sh script, I was surprised to
# discover that the computer turned off despite having reported that there
# was 10 minutes left! I created the battery-status.sh script to aid in my
# understanding of what was going on, and I discovered a variance of about 10
# minutes plus/minus each time that I ran it, so the system is clearly making
# an estimate. Keep the minus 10 minutes in mind when setting the minimum
# value.
# I tested this, I was surprised to discover that the computer turned off
# despite having reported that there was 10 minutes left! I created the
# battery-status.sh script to aid in my understanding of what was going on,
# and I discovered a variance of minutes plus/minus each time that I ran it,
# so the system is clearly making an estimate. Keep this in mind when setting
# the minimum value.
# Change this variable to you liking, but less than 40.00 is likely a bad
# idea. YOU'VE BEEN WARNED!
minimum=40.00
If the minutes of charge are less that the minimum.
If the minutes of charge are less than the minimum.
if (( $(echo "$minutes < $minimum" | bc -l) )); then
echo "Suspending the computer! Battery charge is needed!" | wall -g $group