[ubuntu] Getting CPU tempature on Ubuntu

[Pimaxin]

I have Ubuntu installed on my Raspberry Pi 4 and was wondering if there's a way to run vcgencmd or get the CPU tempature?

[mallets]

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cat /sys/class/thermal/thermal_zone0/temp

works for me. I'm still searching for the CPU freq value though.

[Pimaxin]

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cat /sys/class/thermal/thermal_zone0/temp

works for me. I'm still searching for the CPU freq value though.

What’s 38459 supposed to mean?

[jamesh]

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cat /sys/class/thermal/thermal_zone0/temp

works for me. I'm still searching for the CPU freq value though.

What’s 38459 supposed to mean?

It's a prime number!

[Heater]

The successor to 38458.

[Heater]

A clue for American viewers. It works in Centigrade.

[rpdom]

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cat /sys/class/thermal/thermal_zone0/temp

works for me. I'm still searching for the CPU freq value though.

What’s 38459 supposed to mean?

If that is the value returned from that command for you, it means your CPU temperature is currently 38.459°C

[DougieLawson]

Take the prime number divide by 1000, multiply by 1.8 and add 32. You'l then get the temperature on the scale of that really bad physicist Mr. F.

I'm surprised nobody has suggested getting the userland (https://GitHub.com/raspberrypi/userland) pieces installed on Ubuntu. To add some of the missing pieces.

[Heater]

Now, now, you can't go round calling members of the FRS "bad physisists".

Physics did not exist back then. Guys like Mr F. invented it for us.

Rock bands and authors have been celebrating his name for ages: https://en.wikipedia.org/wiki/Fahrenhei ... biguation)

[BluPI2]

There is a nice way to add this to the taskbar in Ubuntu

Steps
1. Right-click taskbar and click +add to panel

2. Scroll down and Highlight Command(Shows the output of a command), Click Add

3. Right-click the newly added widget, click preferences, and set interval seconds to 5
and max character width to 2. Copy and Paste this command into the Command Box

Code: Select all

cat /sys/class/thermal/thermal_zone0/temp

You now get the temperature displayed in your taskbar which updates every 5 seconds displayed in Celsius.

Even in the United States we still use Centigrade to measure the temperature of a CPU.

[aduen]

For the bash aficionados:

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#!/bin/bash

temp=$(</sys/class/thermal/thermal_zone0/temp)

temp_f=`echo "$temp/1000" | bc -l`
printf "CPU Temp: %.3f°C\n"  $temp_f

>> CPU Temp: 40.407°C

[aturfer]

For those who feel like compiling something, create file temp.c with the following:

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#include <stdio.h>

int main(int argc, char *argv[]) 
{
   FILE *fp;

   int temp = 0;
   fp = fopen("/sys/class/thermal/thermal_zone0/temp", "r");
   fscanf(fp, "%d", &temp);
   printf(">> CPU Temp: %.2f°C\n", temp / 1000.0);
   fclose(fp);

   return 0;
}

Compile with:

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$ gcc temp.c -o temp

Then copy to directory in your path:

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$ sudo mv ./temp /usr/local/bin/

Run from anywhere:

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aturfer@pi4:~$ temp
>> CPU Temp: 42.35°C

[aturfer]

I'm still searching for the CPU freq value though.

Current CPU frequency:

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echo ">> CPU Freq:" $(($(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq)/1000))MHz

To get min/max CPU frequency range:

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lscpu | grep -i mhz

[saikiran91]

For those who feel like compiling something, create file temp.c with the following:

Code: Select all

#include <stdio.h>

int main(int argc, char *argv[]) 
{
   FILE *fp;

   int temp = 0;
   fp = fopen("/sys/class/thermal/thermal_zone0/temp", "r");
   fscanf(fp, "%d", &temp);
   printf(">> CPU Temp: %.2f°C\n", temp / 1000.0);
   fclose(fp);

   return 0;
}

Compile with:

Code: Select all

$ gcc temp.c -o temp

Then copy to directory in your path:

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$ sudo mv ./temp /usr/local/bin/

Run from anywhere:

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aturfer@pi4:~$ temp
>> CPU Temp: 42.35°C

Simple and sexy. One more request how can we get a continuous updates.