How to publish DS18B20 to MQTT

ESPHome
,
1

Hi, I am a newbe in esphome and try to learn…I have MQTT running for years for my other sensors but I would like to publish my temperatures to MQTT from an esphome sensor. The hardware is running fine and I get temperature results in the webserver of the sensor. Now I would like to publish to MQTT but can’t find an working example. This is the code so far and the editor is complaining about the id.

Couldn't find ID 'sensor_1'. Please check you have defined an ID with that name in your configuration. These IDs look similar: "sensor_6".

mqtt:
  broker: "192.168.1.45"
  username: !secret mqtt_uid
  password: !secret mqtt_password
  topic_prefix: "sensors/buffervat-test"

dallas:
  - pin: D4
    id: sensor_1

sensor:
  - platform: dallas
    address: 0xd50000001e6f7028
    name: "sensor_1"
    id: sensor_1
    on_value:
      - mqtt.publish:
          topic: "sensors/buffervat-test/sensor_1"
          payload: !lambda |-
            return to_string(id(sensor_1).state)

  - platform: dallas
    address: 0xbe0000001c27bf28
    name: "sensor_6"
    id: sensor_6
    on_value:
      - mqtt.publish:
          topic: "sensors/buffervat-test/sensor_6"
          payload: !lambda |-
            return to_string(id(sensor_6).state)
1 Like
2

Hi,
Two steps:

  1. Get the 1-wire sensor working as an entity in HASS (e.g. sensor.1wire_temperature_1 below)
  2. Publish the entity state to MQTT to the topic and format you want using a JINJA template

Here’s a working example from my automation.yaml:

- id: '1234567890123456789'
  alias: Publish iButton temperature to MQTT
  description: ''
  trigger:
  - platform: time_pattern
    minutes: '0'
  - platform: time_pattern
    minutes: '30'
  condition: []
  action:
  - service: mqtt.publish
    data:
      topic: stat/1wiretemps/logvalue
      retain: true
      payload_template: '"{{ as_timestamp(now())|timestamp_custom(''%Y-%m-%d %H:%M:%S'')
        + " " + states(''sensor.1wire_temperature_1'') + " " + states(''sensor.1wire_temperature_2'')

I’d also suggest moving the HASS MQTT broker config to the GUI and not in YAML:

If this helps, :heart: this post!

3

He is asking about esphome.

Once you get mqtt activated in esphome, the data of all sensors will be published to mqtt.

4

Is this how to activate MQTT in esphome? And than the values should appear in the topic?

5

It works now. I had to add the broker in my configuration.yaml;

mqtt:
  broker: 192.168.1.45

Values are now published automatically in MQTT. Now I have to figure out how to omit the automatic topics.

mqtt:
  broker: "192.168.1.45"
  username: !secret mqtt_uid
  password: !secret mqtt_password
  topic_prefix: "sensors/buffervat-test"

dallas:
  - pin: D4

sensor:
  - platform: dallas
    address: 0xd50000001e6f7028
    name: "sensor 1"
    state_topic: "sensors/buffervat-test/s1" # this forces MQTT to put values in this topic
  - platform: dallas
    address: 0xf20000001d0f1c28
    name: "sensor 2"
    state_topic: "sensors/buffervat-test/s2"
  - platform: dallas
    address: 0x9b12f35709646128
    name: "sensor 3"
    state_topic: "sensors/buffervat-test/s3"
  - platform: dallas
    address: 0x8e0000001ea81528
    name: "sensor 4"
    state_topic: "sensors/buffervat-test/s4"
  - platform: dallas
    address: 0xcb0000001e08c328
    name: "sensor 5"
    state_topic: "sensors/buffervat-test/s5"
  - platform: dallas
    address: 0xbe0000001c27bf28
    name: "sensor 6"  
    state_topic: "sensors/buffervat-test/s6"

Schermafbeelding 2024-03-10 om 17.01.38
Schermafbeelding 2024-03-10 om 17.01.38574×590 44.2 KB

6

Hi James, thanks a lot. This was indeed plan B. And if I can’t get rid off the automatically published rubbish I will work out plan B :stuck_out_tongue_winking_eye: