How to show the Raspberry Pi CPU temperature?

Configuration
41

System monitor shows the cpu temperature for RPi? I don’t see it under configuration variables.

42

No system monitor does not include CPU temperature. Use this sensor:

- platform: command_line
  name: CPU Temperature
  command: "cat /sys/class/thermal/thermal_zone0/temp"
  unit_of_measurement: "°C"
  value_template: '{{ value | multiply(0.001) | round(1) }}'

And for the GPU:

- platform: command_line
  name: GPU Temperature
  command: "/opt/vc/bin/vcgencmd measure_temp"
  unit_of_measurement: "°C"
  value_template: '{{ value | replace("temp=", "") | replace("''C", "") }}'
7 Likes
43

On my system (Raspbian Release 9.6, Kernel version: 4.14) I do not have this command…

1 Like
44

Any time I use the degree symbol in my yaml, like:

unit_of_measurement: “°C”

I get an error:

Error loading /config/configuration.yaml: ‘utf-8’ codec can’t decode byte 0xb0 in position 2830: invalid start byte

It works fine if I leave that line out.

45

Try using different quotes. Single quotes work, also note the difference between your double quotes and the ones below.

unit_of_measurement: '°C'

unit_of_measurement: "°C"

46

I tried both kinds of quotes, no difference. The double quotes only looked wrong here in the forum because I quoted the line instead of using a code block like I should have.

I also verified that I’m using ASCII character decimal 176, xB0.

If I delete just that one character, the config checks OK. If I re-add it, I get the error again. I’ve already moved on, not worth worrying about. I used legit’s method of displaying in F, which works fine.

47

Use notepad++ and make sure the format of the file is UTF8… Sometimes it changes to western or something like that…

1 Like
48

Bingo!! Changed it to UTF8 and no more errors. Thanks!!!

49

Yeah that error is a bastard to track down.

50

Any reason you don’t do this within the customise section in GUI?

51

Do what specifically?

52

To set a unit of measurement:

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53

It works for HassOS.

54

this does not work anymore on 64 bit hassio image.

core-ssh:~# cat /sys/class/thermal/thermal_zone0/temp 
cat: read error: Invalid argument
55

Agreed, I am getting the same error when attempting this command on my Pi 4B running HassOS 3.3 64 bit.

57

HassOS 3.3? How do you get that version, I am still on 2.12 and it doesn’t offer an upgrade?

58

Just my personal opinion but; unless you need to address more than 4G of RAM, a 64bit O/S won’t buy you anything more than the 32bit O/S has to give you.

59

HassOS 3.4 has been released which fixes the CPU temp command for those affected (usage example):

cat /sys/class/thermal/thermal_zone0/temp
2 Likes
60

I measure mine in this way:

  - platform: command_line
    name: CPU Temp
    command: "cat /sys/class/thermal/thermal_zone0/temp"
    unit_of_measurement: "°C"
    value_template: "{{ value | multiply(0.001) | round(1) }}"

  - platform: command_line
    name: GPU Temp
    command: "/opt/vc/bin/vcgencmd measure_temp"
    unit_of_measurement: "°C"
    value_template: '{{ value | regex_findall_index("=([0-9]*\.[0-9]*)", 0) }}'

  - platform: command_line
    name: CPU Clock
    command: "/opt/vc/bin/vcgencmd measure_clock arm"
    unit_of_measurement: "MHz"
    value_template: '{{ value | regex_findall_index("=([0-9]*)", 0) | multiply(0.000001) | round(0) }}'
5 Likes
61

I’m getting the sensor value in °F

# Sensor entry for Configuration.yaml
  - platform: command_line
    name: RPi CPU Temp
    command: "cat /sys/class/thermal/thermal_zone0/temp"
    # If errors occur, make sure configuration file is encoded as UTF-8
    unit_of_measurement: "°C"
    value_template: '{{ value | multiply(0.001) | round(1) }}'

Is this just LoveLace trying to be smart and show me it in imperial units (which is the standard for my system)?
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