Tracking, monitoring host RPI CPU temperature with Home Assistant

Most Linux systems give you the current temperature of the CPU when you read the file. /sys/class/thermal/thermal_zone0/temp

You will get a single line of text with the temperature as an Integer. So you have to divide the result by 1000 to get the temperature in °C

Knowing this we can make a command_line sensor in HomeAssistant

FYI: I needed this to evaluate my passive cooling PI case

command_line:
  - sensor:
      name: CPU Temperature
      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) }}"

Reload home assistant after the addition to the config