Sensor temperature (mqtt topic) in fahrenheit

Configuration Frontend
1

hi,

i did a sensor (temperature sensor) that receive my weather station temperature from mqtt topic.
see below

sensor:
   - platform: mqtt
      unit_of_measurement: '°C'
      name: "thermo"
      state_topic: "rtl_433/AlectoV1-Temperature/40"
      force_update: true
      value_template: "{{ value_json.temperature_F }}"

unfortunatly, even if “unit_of_measurement” is in °C, the temperature is always display in fahrenheit.
i would like to convert it to celsius

do you know how to do so ?
thanks
Regards

2

temperature always converts to your system units. So if you select imperial as your system units, all temperatures will be displayed in ºF.

The only way to avoid this automatic setting is to change the unit_of_measurement to something other than ºF or ºC. Also, do not set the device_class.

  unit_of_measurement: 'Celcius'
3

I don’t understand because my homeassistant settings are set to “Celsius” and “Kilogram”

4

Then your unit_of_measurement needs to be ºF so that the system knows the units are in ºF so it can convert it to ºC for you.

and add, device_class: temperature

5

Thx for your help

Seems not working

to be sure please see my configuration.yaml file

# Loads default set of integrations. Do not remove.
default_config:

mqtt:
  broker: 192.168.1.22
  username: umqtt
  password: pass4UMQTT
  discovery: true


influxdb:
  host: a0d7b954-influxdb
  port: 8086
  database: homeassistant
  username: homeassistant
  password: homeassistant
  max_retries: 3
  default_measurement: state

# Text to speech
tts:
  - platform: google_translate

homeassistant:
  customize:
    binary_sensor.zone1:
      device_class: door
  customize_domain:
    light:
      assumed_state: false


    
automation: !include automations.yaml
script: !include scripts.yaml
scene: !include scenes.yaml
logger:
  default: error
  logs:
    homeassistant.components.enocean: debug
    homeassistant.components.mqtt: debug
api:

switch:
  - platform: mqtt
    name: "Example_Switch"
    command_topic: "room/light"
    payload_on: "on"
    payload_off: "off" 
  - platform: mqtt
    name: "Switch 1"
    command_topic: "tele/sonoff10/LWT"
  - platform: mqtt
    name: "MQTT"
    command_topic: "home/bedroom/switch1/set"
  -  platform: rpi_gpio
     ports:
       23: Sirene
light:
  - platform: mqtt
    name: "LMQTT"
    command_topic: "hom/dd"
sensor:
  - platform: mqtt
    device_class: temperature
    unit_of_measurement: '°C'
    name: "thermo"
    state_topic: "rtl_433/AlectoV1-Temperature/40"
    force_update: true
    value_template: "{{ value_json.temperature_F }}"
  - platform: mqtt
    unit_of_measurement: '°C'
    name: "thermoLaCrosse"
    unit_of_measurement: '°C'
    state_topic: "rtl_433/LaCrosse-WS2310/226"
    force_update: true
    value_template: "{{ value_json.temperature_F }}"
binary_sensor:
  - platform: mqtt
    name: "en_porte1"
    device_class: "window"
    state_topic: "fhem/en_porte1/state"
    payload_on: "open"
    payload_off: "closed"
  - platform: mqtt
    name: "pir_chambre"
    device_class: "motion"
    state_topic: "fhem/pir_chambre/state"
    payload_on: "on"
    payload_off: "off"
  - platform: mqtt
    name: "pir_bureau"
    device_class: "motion"
    state_topic: "fhem/pir_bureau/state"
    payload_on: "on"
    payload_off: "off"
  - platform: mqtt
    name: "pir_salon"
    device_class: "motion"
    state_topic: "fhem/pir_salon/state"
    payload_on: "on"
    payload_off: "off"
  - platform: mqtt
    name: "pir_entree"
    device_class: "motion"
    state_topic: "fhem/pir_entree/state"
    payload_on: "on"
    payload_off: "off"
  - platform: rpi_gpio
    invert_logic: true
    ports: 
      5: zone1

Capture

The mqtt message is sent in Fahrenheint

{“time”:“2022-06-29 16:03:10”,“model”:“AlectoV1-Temperature”,“id”:40,“channel”:1,“battery_ok”:1,“temperature_F”:84.38,“humidity”:20,“mic”:“CHECKSUM”}

I want it to be displayed in Celsius

Thanks again for your support
regards

6

You have to put the units in ºF, not ºC. Are you reading what I’m telling you to do?

Change to ‘°F’

Change to ‘°F’

Change to ‘°F’

You should not have ºC anywhere in your configuration if the device is outputing ºF.

When you tell the system that a value is ºC, then the system thinks “Hey, I don’t need to convert this because it’s already in ºC”.

You’re telling the system not to convert it.

7

Apologies !!!
ok it is working and i do understand now

Thx

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