58 lines
2.2 KiB
Bash
Executable File
58 lines
2.2 KiB
Bash
Executable File
#/bin/bash
|
|
|
|
# battery-monitor.sh
|
|
# This program lets the user know when the battery needs to be charged.
|
|
# Copyright (c) 2024, Scott C. MacCallum (scott@scm-guru.live).
|
|
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Affero General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# at your option) any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Affero General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU Affero General Public License
|
|
# along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
# To do. Add code to verify that the user is root, or has run the script with
|
|
# sudo. Add code to verify that the bc program is installed.
|
|
|
|
# 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
|
|
# their own group e.g. scm.
|
|
|
|
group=""
|
|
|
|
# Change the battery variable to your batteries identification e.g. BAT0.
|
|
|
|
battery=""
|
|
|
|
charge=$(cat /sys/class/power_supply/$battery/charge_now)
|
|
discharge=$(cat /sys/class/power_supply/$battery/current_now)
|
|
hours=$(echo "scale=2; $charge / $discharge" | bc -l)
|
|
minutes=$(echo "scale=2; $hours * 60" | bc -l)
|
|
|
|
# Change the minimum variable to the minimum amount of minutes that a battery
|
|
# has left before the group is informed to recharge it e.g. 50.00. 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. Keep the minus 10 minutes in
|
|
# mind when setting the minimum value.
|
|
|
|
# YOU'VE BEEN WARNED!
|
|
|
|
minimum=
|
|
|
|
if (( $(echo "$minutes < $minimum" | bc -l) )); then
|
|
echo "Suspending the computer! Battery charge is needed!" | wall
|
|
sleep 3
|
|
systemctl suspend
|
|
fi
|
|
|
|
exit 0
|