Solution: CPU Temperature Monitoring on Raspberry Pi4

Raspberry Pi4 CPU temperature monitoring with bash script

I had an issue that during operation, my Raspberry Pi4 had a CPU temperature higher than 60 degrees Celsius. I wanted to check in which period of the day this happens, and I developed a script that periodically saved information about the temperature in a log file.

Bash script

To check periodically temperature on my Raspberry Pi4 on Ubuntu 22.04 I developed the following script:

#!/bin/bash

LOG_FILE="/opt/scripts/log/check_temp_$(date +%Y-%m-%d).log" # Location for log file
echo "Check temperature script is executed on $(date)"  >> $LOG_FILE

# Loop indefinitely
while :
do
  temp=$(sensors| grep "temp1" | awk '{print $2}')
  echo "$(date): Temp: $temp" >> $LOG_FILE
  sleep 600
  # Check if the date has changed
  if [ "$(date +%Y-%m-%d)" != "$(date -r "$LOG_FILE" +%Y-%m-%d)" ]; then
     # Create a new log file for the new day
     LOG_FILE="/opt/scripts/log/check_temp_$(date +%Y-%m-%d).log"
     echo "Script is executed on $(date)" >> "$LOG_FILE"
  fi
done

You can save the script on the following script:

nano /opt/scripts/check_temp.sh

To make it executable:

chmod +x /opt/scripts/check_temp.sh

Add the script in the Crontab

To run it after every reboot, automatically add the following line in the cron:

# Check temp
@reboot sleep 180 && sudo bash /opt/scripts/check_temp.sh

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