How to find out Raspberry Pi GPU and ARM CPU temperature on Linux

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I am using a Raspberry PI 2/3 credit size computer. How do I find out my Raspberry PI GPU or CPU temperature from Linux operating system command line option? How do I monitor the core temperature of my Raspberry Pi 3?

The Raspberry Pi is a small and affordable computer for student and hobbyist. You can us it to learn programming, Linux, sysadmin and devops stuff. One can easily find out the Raspberry Pi GPU and ARM CPU core temperature using the following commands.

Show Raspberry Pi GPU temperature

Open the Terminal application and type the following command to view GPU (Graphics Processing Unit) temperature:
vcgencmd measure_temp
OR
/opt/vc/bin/vcgencmd measure_temp
Sample output:

Fig.01: Find Raspberry pi GPU temperature
Fig.01: Find Raspberry pi GPU temperature

Display Raspberry Pi ARM CPU temperature

Type the following cat command:
cat /sys/class/thermal/thermal_zone0/temp
Divide it by 1000 to get the ARM CPU temperature in more human readable format:

cpu=$(</sys/class/thermal/thermal_zone0/temp)
echo "$((cpu/1000)) c"

Sample outputs:

Fig.02: Check on the ARM CPU temperature of Raspberry Pi
Fig.02: Check on the ARM CPU temperature of Raspberry Pi

Raspberry Pi get temperature – Putting it all together

Create a simple bash script called my-pi-temp.sh to see both ARM CPU and GPU temperature of Raspberry Pi. Type the following command:
nano my-pi-temp.sh
OR
vi my-pi-temp.sh
Append the following code:

#!/bin/bash
# Script: my-pi-temp.sh
# Purpose: Display the ARM CPU and GPU  temperature of Raspberry Pi 2/3 
# Author: Vivek Gite <www.cyberciti.biz> under GPL v2.x+
# -------------------------------------------------------
cpu=$(</sys/class/thermal/thermal_zone0/temp)
echo "$(date) @ $(hostname)"
echo "-------------------------------------------"
echo "GPU => $(/opt/vc/bin/vcgencmd measure_temp)"
echo "CPU => $((cpu/1000))'C"

Save and close the file. Set permission:
chmod +x my-pi-temp.sh
Run it as follows:
./my-pi-temp.sh
Sample outputs:

Thu 10 Mar 01:02:19 IST 2016 @ raspberrypi
-------------------------------------------
GPU => temp=44.4'C
CPU => 44'C

Conclusion

This page explained how to monitor the core temperature of your Raspberry Pi. For more info see this page.

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

Start the discussion at www.nixcraft.com

Historical Comment Archive

14 comment

  1. The temperature sensor for the SoC is on the same silicon. Your reading the same sensor for CPU when you say access to GPU. Propagation(delay) is what you are seeing when accessing the temperature for the CPU when you are assigning for the GPU temperature. Same sensor, CPU temperature access is correct but your GPU does not have a sensor independently. Just a CPU temperature can be truly accessed. Leave out the GPU temp and you will be correct. Same metric for temperatures.

  2. best way to see thermal temps and arm_freq via terminal command:
    while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 1; done

    To check it under 100% CPU load:
    sudo apt-get install sysbench
    while true; do vcgencmd measure_clock arm; vcgencmd measure_temp; sleep 1; done& sysbench –num-threads=8 –test=cpu –cpu-max-prime=10000000000 run

    For optimizing, benching, and overclocking, see:
    https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=138840

  4. In one line:

    echo -e "CPU => $(echo "scale=1; $(cat /sys/class/thermal/thermal_zone0/temp)/1000" | bc)'C\nGPU => $(/opt/vc/bin/vcgencmd measure_temp | sed "s/^.....//g")"

  5. Thank you, great post!

    Just a simple addition to your ‘my-pi-temp.sh’ script:

    echo "GPU => $(/opt/vc/bin/vcgencmd measure_temp | cut -d = -f2)"

    Makes the output a little cleaner ;-)

  6. Below is the script I use for displaying RPi temperature and frequencies. It’s a hack, but usable.

    #!/usr/bin/ksh
# Required for floating point arithmetic.  (Use bc to accommodate bash)
# sensors.sh
# A script to display Raspberry Pi on-board sensor data
#
# LGD: Mon Dec 23 04:07:23 PST 2013
# LGD: Mon Aug 10 14:02:46 PDT 2015: Added degree symbols, over-temperature based on degrees C so it will work without bc
#
 
f2c(){                          # Fahrenheit to Celsius
  echo $(( ((${1}-32)*5)/9 ))
}
 
c2f(){                          # Celsius to Fahrenheit
  echo $(( ${1}*9/5+32 ))
}
 
addcomma(){                     # Format numbers with commas
  (echo "obase=1000"; cat) | bc | sed 's/^ *0*([0-9])/1/;s/ /,/g'
}
 
# Display current clock frequencies
FREQ (){ echo -e "nttt`tput smso`  C L O C K    F R E Q U E N C I E S  `tput rmso`n"
  for src in arm core h264 isp v3d uart pwm emmc pixel vec hdmi dpi ;do
    echo -e "t$srct$(vcgencmd measure_clock $src) Hz"
  done| pr --indent=5 -r -t -2 -e3
  echo
}
 
 
TEMPC=$(/opt/vc/bin/vcgencmd measure_temp|awk -F "=" '{print $2}')      # Get Temp C
TEMPf=$(echo -e "$TEMPC" | awk -F "'" '{print $1}' 2&gt;/dev/null)        # Get numeric-only Temp C
 
TEMPF=$(c2f $TEMPf)                                                     # Convert CPU temp C to F
OVRTMP=70                                                               # High-temp limit degrees C
ALRM=""
 
[[ `echo $TEMPC|cut -d. -f1` -gt ${OVRTMP:-70} ]] &amp;&amp; ALRM="nttt TOO HOT! t TOO HOT! t TOO HOT! "           # Check for over-temp: Max = 70C or 158F
TEMPB4OVER=$(echo "${OVRTMP:-70}-${TEMPf}"|bc -l)                               # Calculate the number of degrees before over-temp condition
 
echo -e "nttt`tput smso`  S Y S T E M    T E M P E R A T U R E  `tput rmso`   `[[ -n $ALRM ]] || COLOR=green; setterm -foreground ${COLOR:-red}`${ALRM:-OK}"; setterm -foreground white
 
echo -e "ntThe BCM2835 SoC (CPU/GPU) temperature is: ${TEMPF}° Ft(${TEMPf}° C) `tput smso;setterm -foreground red`$ALRM`setterm -foreground white;tput rmso`"        # ksh &amp; bash
 
echo -e "tt(${OVRTMP:-70}° C HIGH-TEMP LIMIT will be reached in `tput smso`${TEMPB4OVER}° C`tput rmso` higher)n"
 
echo -e "nttt`tput smso`  S Y S T E M    V O L T A G E S  `tput rmso`"
echo -e "ntThe Core voltage is:ttc"
/opt/vc/bin/vcgencmd measure_volts core|awk -F "=" '{print $2}'
 
echo -e "tThe sdram Core voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_c|awk -F "=" '{print $2}'
 
echo -e "tThe sdram I/O voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_i|awk -F "=" '{print $2}'
 
echo -e "tThe sdram PHY voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_p|awk -F "=" '{print $2 "n"}'
 
FREQ
exit

  7. Larry, very useful script! I hope you don’t mind a few changes that I made.

    # sensors.sh
# ==========
#
# A script to display Raspberry Pi on-board sensor data
#
# Larry Dighera: Mon Dec 23 04:07:23 PST 2013
# Larry Dighera: Mon Aug 10 14:02:46 PDT 2015: Added degree symbols, over-temperature based on degrees C so it will work without bc
# Richard Elkins: 2016-08-28:
#   * Checked for installation of `bc`.  Proceed with installation if not present (which fails if no Internet connection).
#   * Miscellaneous readability
#   * Deleted f2c() and addcomma() because they are never used
#   * Deleted c2f() because it produces bash syntax errors and Farenheit is not useful in this context
#   * Deleted first line "#!/usr/bin/ksh".  Diagnosing the Bourne shell instead.
#   * Deleted the  characters which seem to be spurious (?)
 
# --- FREQ: Display current clock frequencies
FREQ () {
   echo -e "nttt`tput smso`  C L O C K    F R E Q U E N C I E S  `tput rmso`n"
   for src in arm core h264 isp v3d uart pwm emmc pixel vec hdmi dpi ;do
      echo -e "t$srct$(vcgencmd measure_clock $src) Hz"
   done | pr --indent=5 -r -t -2 -e3
   echo
}
 
# --- Main Procedure
 
# Diagnose the Bourne shell which is not supported
if [ `ps | tail -n 4 | sed -E '2,$d;s/.* (.*)/1/'` = "sh" ]; then
   echo
   echo "*** Oops, the Bourne shell is not supported"
   echo
   exit 86
fi
 
# Make sure that `bc` is installed
flagbc=`which bc`
if [ -z $flagbc ]; then
   echo Installing bc # {small}
   sudo apt-get -y install bc
fi
 
# Do temperature calculations
TEMPC=$(/opt/vc/bin/vcgencmd measure_temp|awk -F "=" '{print $2}')      # Get Temp C
TEMPf=$(echo -e "$TEMPC" | awk -F "'" '{print $1}' 2&gt;/dev/null)        # Get numeric-only Temp C
OVRTMP=70                                                               # High-temp limit degrees C
ALRM=""
[[ `echo $TEMPC|cut -d. -f1` -gt ${OVRTMP:-70} ]] &amp;&amp; ALRM="nttt TOO HOT! t TOO HOT! t TOO HOT! "           # Check for over-temp: Max = 70C or 158F
TEMPB4OVER=$(echo "${OVRTMP:-70}-${TEMPf}"|bc -l)                               # Calculate the number of degrees before over-temp condition
 
# Display temperatures
echo -e "nttt`tput smso`  S Y S T E M    T E M P E R A T U R E  `tput rmso`   `[[ -n $ALRM ]] || COLOR=green; setterm -foreground ${COLOR:-red}`${ALRM:-OK}"; setterm -foreground white
echo -e "ntThe BCM2835 SoC (CPU/GPU) temperature is: ${TEMPf}°C `tput smso;setterm -foreground red`$ALRM`setterm -foreground white;tput rmso`"
echo -e "t(${OVRTMP:-70}°C HIGH-TEMP LIMIT will be reached in `tput smso`${TEMPB4OVER}°C`tput rmso` higher)n"
 
# Display voltages
echo -e "nttt`tput smso`  S Y S T E M    V O L T A G E S  `tput rmso`"
echo -e "ntThe Core voltage is:ttc"
/opt/vc/bin/vcgencmd measure_volts core|awk -F "=" '{print $2}'
echo -e "tThe sdram Core voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_c|awk -F "=" '{print $2}'
echo -e "tThe sdram I/O voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_i|awk -F "=" '{print $2}'
echo -e "tThe sdram PHY voltage is:tc"
/opt/vc/bin/vcgencmd measure_volts sdram_p|awk -F "=" '{print $2 "n"}'
 
# Display frequencies
FREQ
exit

    1. You need to wrap script between <pre> and </pre> . I edited out to add <pre> and </pre> in your comment. Cheers.


  11. def get_temp():
    with open('/sys/class/thermal/thermal_zone0/temp', 'r') as infile:
    return float(infile.read()) * 1e-3

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