PiTemps
This page was last modified: 27 May 2023 10:59 CE(S)T.
This script shows the temperature of the ARM CPU of you Raspberry Pi: current, mean, lowest and highest. You can choose between Celcius of Fahrenheit. It uses three text files to store data:
pitemps_file for the last temperatures pitemps_data_file to calculate an mean temperature pitemps_data_file_plot for plotting/arhiving You can tweak the update interval (standard 4 secs) and the number of hours to use for the mean. Other variables are in the first part of this script.
To make a plot, see the configuration file 'pitemps-gnuplot.conf'.
The code can also be found on my GitHub.
Both files are below.
pitemps.sh
#!/bin/bash
#
# ++++ Raspberry Pi Temperature script ++++
#
# By MeganerdNL
#
# This script shows the temperature of the ARM CPU of you Raspberry Pi: current, mean, lowest and highest.
# You can choose between Celcius of Fahrenheit.
# It uses three text files to store data:
# - pitemps_file for the last temperatures
# - pitemps_data_file_mean to calculate a mean temperature
# - pitemps_data_file_plot for plotting/arhiving
#
# You can tweak the update interval and the number of hours to use for the mean.
# Other variables are in the first part of this script.
#
# To make a plot, see the configuration file 'pitemps-gnuplot.conf'
#
# ---- ---- ---- ---- ---- Change variables below this line ---- ---- ---- ---- ----
# Update time in seconds
# Note: the script will finish the whole duration of update time at exit. Make it too long and the waiting time on exit can be long
# CTRL-C is disabled by default. You can enable it by commenting out "trap '' 2" below
# Doing a CTRL-C will disable output to the file with last temperatures however
update_interval=4
# Number of hours to use for the mean.
no_hours_mean=1
# Number of hours to store for plotting/archiving (the data older than this will be deleted)
no_hours_plot=168
# Which directory to use to store the files (must be writable, will be created if necessary)
pitemps_dir=~/pitemps
# Name of the file containing the last temperatures (mean, high and low)
pitemps_file=pitemps-last.txt
# Name of the data file containing the temperatures used for the mean
pitemps_data_file_mean=pitemps-data-mean.txt
# Name of the data file containing the temperatures for plotting/archiving
pitemps_data_file_plot=pitemps-data-plot.txt
# Make backups of data files if they exist? 1 for Yes and 2 for No
make_backups=1
# Date format (see 'man date' for help). Default %d-%m-%Y %H:%M:%S - 14-05-2017 20:48:23
date_format="%d-%m-%Y %H:%M:%S"
# Temperature scale: 1 for degree Celcius, 2 for degree Fahrenheit
temp_scale=1
# Trap 'signal 2' to disable CTRL-C
# CTRL-C is disabled by default. You can enable it by commenting out this variable
# Doing a "CTRL-C" will disable output to the file with last temperatures however
trap '' 2
# ---- ---- ---- ---- ---- Change variables above this line ---- ---- ---- ---- ----
# Official version. Please don't change.
version=2.2.1
# ---- ---- ---- ---- ---- Begin of variable check section ---- ---- ---- ---- ----
# Check if 'bc' installed? (required)
command -v bc >/dev/null 2>&1 || { echo; echo >&2 "Error: program 'bc' is not installed, please install it ('sudo apt install bc')"; echo; exit 1; }
# Check if the update time is valid (must be an integer)
re='^[0-9]+$'
if ! [[ $update_interval =~ $re ]]
then
echo
echo "Error: Number of seconds update time must be an integer (1,2,3 etc.). It is now set to '$update_interval'. Please check variables in pitemps file."
echo
exit 1
fi
# Check if the number of hours for the mean is valid (must be an integer)
if ! [[ $no_hours_mean =~ $re ]]
then
echo
echo "Error: Number of hours to use for mean must be an integer (1,2,3 etc.). It is now set to '$no_hours_mean'. Please check variables in pitemps file."
echo
exit 1
fi
# Check if the option to make backups is valid
if [[ $make_backups != 1 && $make_backups != 2 ]]
then
echo
echo "Error: Option to make backups must be 1 (Yes) or 2 (No). It is now set to '$make_backups'. Please check variables in pitemps file."
echo
exit 1
fi
# Check if the temperature scale is valid
if [[ $temp_scale != 1 && $temp_scale != 2 ]]
then
echo
echo "Error: Temperature scale must be 1 (Celcius) or 2 (Fahrenheit). It is now set to '$temp_scale'. Please check variables in pitemps file."
echo
exit 1
fi
# Check if the directory to store the files exists and if it's writable
if [[ ! -d $pitemps_dir ]]
then
if [[ -w $(dirname "$pitemps_dir") ]]
then
mkdir $pitemps_dir
else
echo
echo "Error: Cannot create pitemps directory '$pitemps_dir' - No write permission. Please check variables in pitemps file."
echo
exit 1
fi
else
if [[ ! -w $pitemps_dir ]]
then
echo
echo "Error: No write permissions in pitemps directory '$pitemps_dir'. Please check variables in pitemps file."
echo
exit 1
fi
fi
# Max hours 9999
if [[ $no_hours_mean -gt 9999 ]]
then
echo
echo "Error: Too many hours for calculation mean (max 9999). It is now set to '$no_hours_mean'. Please check variables in pitemps file."
echo
exit 1
fi
# ---- ---- ---- ---- ---- End of variable check section ---- ---- ---- ---- ----
# This is to make sure the file containing the last variables looks pretty (adds spaces if appropriate)
if [[ $no_hours_mean -gt 999 ]]
then
spaces=" "
elif [[ $no_hours_mean -gt 99 ]]
then
spaces=" "
elif [[ $no_hours_mean -gt 9 ]]
then
spaces=" "
else
spaces=""
fi
# Define function to make the temperatures read by the script human readable and do Fahrenheit converion if appropriate
if [[ $temp_scale = 1 ]]
then
function convert_temp {
bc <<< "scale=1; $1/1000"
}
else
function convert_temp {
bc <<< "scale=1; $1 * 1.8 / 1000 + 32"
}
fi
# Celcius or Fahrenheit symbol
if [[ $temp_scale = 1 ]]
then
deg=$'\xc2\xb0'C
else
deg=$'\xc2\xb0'F
fi
# Some variables to format the output on the screen
noform=$(tput sgr0)
form1=$(tput setaf 6)
form2=$(tput bold)$(tput setaf 3)
form3=$(tput bold)$(tput setaf 2)
form4=$(tput bold)$(tput setaf 1)
# Set the path of the files
pitemps_file_P=$pitemps_dir/$pitemps_file
pitemps_data_file_mean_P=$pitemps_dir/$pitemps_data_file_mean
pitemps_data_file_plot_P=$pitemps_dir/$pitemps_data_file_plot
# Initial (bogus) temperatures, will not be stored
if [[ $temp_scale = 1 ]]
then
low_temp=100.0
high_temp=0.0
else
low_temp=212.0
high_temp=32.0
fi
# Initialize the text files (make backups if appropriate)
if [[ -f $pitemps_file_P ]]
then
if [[ $make_backups = 1 ]]
then
if ! [[ -d $pitemps_dir/backups ]]
then
mkdir $pitemps_dir/backups
cp --backup=t $pitemps_file_P $pitemps_dir/backups/$pitemps_file
else
cp --backup=t $pitemps_file_P $pitemps_dir/backups/$pitemps_file
fi
fi
> $pitemps_file_P
else
touch $pitemps_file_P
fi
if [[ -f $pitemps_data_file_mean_P ]]
then
if [[ $make_backups = 1 ]]
then
if ! [[ -d $pitemps_dir/backups ]]
then
mkdir $pitemps_dir/backups
cp --backup=t $pitemps_data_file_mean_P $pitemps_dir/backups/$pitemps_data_file_mean
else
cp --backup=t $pitemps_data_file_mean_P $pitemps_dir/backups/$pitemps_data_file_mean
fi
fi
> $pitemps_data_file_mean_P
else
touch $pitemps_data_file_mean_P
fi
if [[ -f $pitemps_data_file_plot_P ]]
then
if [[ $make_backups = 1 ]]
then
if ! [[ -d $pitemps_dir/backups ]]
then
mkdir $pitemps_dir/backups
cp --backup=t $pitemps_data_file_plot_P $pitemps_dir/backups/$pitemps_data_file_plot
else
cp --backup=t $pitemps_data_file_plot_P $pitemps_dir/backups/$pitemps_data_file_plot
fi
fi
> $pitemps_data_file_plot_P
else
touch $pitemps_data_file_plot_P
fi
# The time this script was started for the statistics
start_time_script=$(date +"$date_format")
# The time at beginning of the loop to calculate running time and when to truncate data file for mean and plotting/archiving
start_time_loop=$(date "+%s")
# Calculate when the data file for the mean and for plotting/archiving should be truncated
trunc_temp_data_mean=$(( $no_hours_mean * 3600 + $start_time_loop + $update_interval))
trunc_temp_data_plot=$(( $no_hours_plot * 3600 + $start_time_loop + $update_interval))
# Set stty for catching keys
if [[ -t 0 ]]
then
stty -echo -icanon -icrnl time 0 min 0
fi
# Beginning of a loop to update temperatures and times
while true
do
# Read the actual temperature from the sensor, make it human readable and do conversion to Fahrenheir if appropriate
temp=$(convert_temp $(cat /sys/class/thermal/thermal_zone0/temp))
# Check if the temperature is lower than the lowest recorded and change the variable if appropriate
if (( $(bc <<< "$temp < $low_temp") ))
then
low_temp_time=$(date +"$date_format")
low_temp=$temp
fi
# Check if the temperature is higher than the highest recorded and change the variable if appropriate
if (( $(bc <<< "$temp > $high_temp") ))
then
high_temp_time=$(date +"$date_format")
high_temp=$temp
fi
# The current time
current_time=$(date +"$date_format")
# The time during the loop to calculate running time
current_time_loop=$(date "+%s")
# Calculate the time the loop is running in seconds
running_time=$(($current_time_loop-$start_time_loop))
# Convert the running time of the script to human readable format
running_time=$(echo "$((running_time / 86400)) day(s) $((($running_time % 86400) / 3600 )) hour(s) $((($running_time % 3600) / 60)) minute(s) $(($running_time % 60)) second(s)")
# Write temperature and date/time to the data file for the mean and for plotting/archiving
echo $current_time $temp | tee -a $pitemps_data_file_mean_P >> $pitemps_data_file_plot_P
# Truncate the data file for the mean and for plotting/archiving if appropriate (from the top)
if [[ $current_time_loop -gt $trunc_temp_data_mean ]]
then
sed -i '1d' $pitemps_data_file_mean_P
fi
if [[ $current_time_loop -gt $trunc_temp_data_plot ]]
then
sed -i '1d' $pitemps_data_file_plot_P
fi
# Calculate the mean temperature from the data file for the mean
mean_temp=$(awk '{ total += $3 } END { printf"%.1f",total/NR }' $pitemps_data_file_mean_P)
# Clear the screen
clear
# Present the temperatures / times
echo "$(tput cup 2 6)$form1 ---- Raspberry Pi CPU Temperature ----$(tput cup 2 60)$noform v$version"
echo "$(tput cup 4 2)$noform Current temperature:$(tput cup 4 40)| $form2$temp$noform $deg |"
echo "$(tput cup 5 2)$noform Mean temperature - $no_hours_mean hour(s):$(tput cup 5 40)| $form2$mean_temp$noform $deg |"
echo "$(tput cup 7 2)$noform Lowest temperature:$(tput cup 7 40)| $form3$low_temp$noform $deg | $form1($low_temp_time)"
echo "$(tput cup 8 2)$noform Highest temperature:$(tput cup 8 40)| $form4$high_temp$noform $deg | $form1($high_temp_time)"
echo "$(tput cup 10 6)$noform Update interval:$(tput cup 10 40)$form1$update_interval sec."
echo "$(tput cup 11 6)$noform Script was started:$(tput cup 11 40)$form1$start_time_script"
echo "$(tput cup 12 6)$noform Current date/time:$(tput cup 12 40)$form1$current_time"
echo "$(tput cup 13 6)$noform Script is running:$(tput cup 13 40)$form1$running_time"
echo "$(tput cup 16 2)$noform Press $form4'q'$noform to quit/exit..."
echo "$(tput cup 18 5)$noform (Note: exit after max.$form1 $update_interval sec.$noform pressing 'q')"
# Catch 'q' to quit. Then position cursur below the lowest line and break the loop
read input
if [[ "$input" = "q" ]]
then
tput cup 20 0
break
fi
# Sleep for the duration of the update interval
sleep $update_interval
done
# Set stty to normal again
if [[ -t 0 ]]
then
stty sane
fi
# The time this script was stopped for the statistics
stop_time_script=$(date +"$date_format")
# Write the mean temperature to the file with the last temperatures
echo "Mean temperature - $no_hours_mean hour(s): $mean_temp $deg" >> $pitemps_file_P
# Write the lowest temperature to the file with the last temperatures
echo "Lowest temperature: $spaces $low_temp $deg ($low_temp_time)" >> $pitemps_file_P
# Write the highest temperature to the file with the last temperatures
echo "Highest temperature: $spaces $high_temp $deg ($high_temp_time)" >> $pitemps_file_P
# Write the update interval, running time, start and stop times to the file with last temperatures
echo >> $pitemps_file_P
echo "Update interval: $update_interval" >> $pitemps_file_P "sec."
echo "Script started: $start_time_script" >> $pitemps_file_P
echo "Script stopped: $stop_time_script" >> $pitemps_file_P
echo "Script was running: $running_time" >> $pitemps_file_P
# End signal 2 (CTRL-C) trap
trap 2pitemps-gnuplot.conf
# To make the plot do:
#
# cat pitemps-gnuplot.conf | gnuplot
#
# gnuplot must be installed ('sudo apt-get install gnuplot')
# Tweak the variables below to your needs - especially the location of the file (last line)
set terminal png size 800,600
set xdata time
set timefmt "%d-%m-%Y %H:%M:%S"
set output "pitemps.png"
set yrange [20:100]
set grid
set xlabel "Date-Time" offset 0,-1
set ylabel "°C"
set xtics rotate by 45 right
set ytics 20,5,100
set title "CPU temperature Raspberry Pi"
set key left box
plot "~/pitemps/pitemps-data-plot.txt" using 1:3 index 0 title "NameOfYourRpi" with lines