raspberryTools/monitorCPUTemperature.sh at master · framps/raspberryTools · GitHub

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#!/bin/bash

#######################################################################################################################
#
#    Monitor CPU temperature and CPU frequency of a Raspberry. If there exists an original active cooler
#    the fan speed will also be reported.
#    First parameter defines the monitor interval. Default is 3 seconds.
#    All measurements are recorded in a log file
#
#######################################################################################################################
#
#    Copyright (c) 2025 framp at linux-tips-and-tricks dot de
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU 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 General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# 	 This script was inspired by a script written by DistroEx (https://forum-raspberrypi.de/user/66526-distroex/)
#
#######################################################################################################################

readonly MYSELF="$(basename "$0")"
readonly MYNAME=${MYSELF##*/}
readonly LOGFILE="${MYNAME/.sh/}.log"
readonly VERSION="0.2"
readonly GITREPO="https://github.com/framps/raspberryTools"

DELAY=${1:-3} # first parm defines the delay if specified

echo "$MYSELF $VERSION ($GITREPO)"

if ! $which vcgencmd &> /dev/null; then
    echo "No vcgencmd detected."
    exit 42
fi

[[ -d /sys/devices/platform/cooling_fan ]]
FAN_AVAILABLE=$((! $? ))

cnt=0

function finish() {

    trap - SIGINT

    local rc=$1

    if [[ -f $LOGFILE ]]; then
        echo
        echo "$LOGFILE with $cnt entries created"
    fi
    exit $rc
}

[[ -f $LOGFILE ]] && rm $LOGFILE # make sure log is deleted an all future logs can be appended

trap 'finish $?' SIGINT

if (( $FAN_AVAILABLE )); then
	echo -e "Time \t\tFan \tCPU \tPMIC \tFreq" | tee -a "$LOGFILE"
else
	echo -e "Time \t\tCPU \tPMIC \tFreq" | tee -a "$LOGFILE"
fi

while true; do
    (( $FAN_AVAILABLE )) &&  FAN="$(< /sys/devices/platform/cooling_fan/hwmon/*/fan1_input)"
    CPU="$(vcgencmd measure_temp | cut -d "=" -f 2)"
    CPU="${CPU//\'C/}"
    PMIC="$(vcgencmd measure_temp pmic | cut -d "=" -f 2)"
    PMIC="${PMIC//\'C/}"
    FREQ="$(vcgencmd measure_clock arm | cut -d "=" -f 2)"
    FREQ="$(($FREQ / 1000000))"
    TIME="$(date +%H:%M:%S)"
if (( $FAN_AVAILABLE )); then
    echo -e "$TIME \t$FAN \t$CPU \t$PMIC\t$FREQ" | tee -a "$LOGFILE"
else
  echo -e "$TIME \t$CPU \t$PMIC\t$FREQ" | tee -a "$LOGFILE"
fi
    ((cnt++))
    sleep $DELAY
done