Setting brightness by MQTT

Configuration
,
1

Hello,

I would like to control a light with an incoming value (1-255) from an ESP8266.
I checked several examples, but I am still struggling with the automations.yaml.

The examples I found are quite different, for e.g. sometimes this is inlcuded
and sometimes not:

target:
 entity_id: xyz

As a beginner this is quite confusing. Therefore I am not sure, if my issue is “only”
for processing the value for brightness or it is something else…
Can someone help me, please?

So , the payload I receive from ESP is a value between 1-255, e.g. 87.

The publisehd topic is below.
This is working, I checked it with the Mosquitto of HA.

topic: /Bathroom/Light/BRT

Here is the automations.yaml. I tried several variations of it but this seems the most suitable.

- id: '1000003'
  alias: S Lampe BRT
  description: ''
  trigger:
  - platform: mqtt
    topic: /Bathroom/Light/BRT
  condition: []
  action:
  - service: light.turn_on
    data:
      brightness: "{{ value_json.brightness | from_json }}"
    device_id: 69c6babc1512d237ae2f374041751a0b
    entity_id: light.s
    domain: light
  mode: single

How do I set brightness correctly?

Many thanks in advance!

3

If the payload received from the ESP is in JSON format, for example, something like this:

{ "brightness": 87 }

then use the following template to get the brightness value:

{{ trigger.payload_json.brightness }}

Example

- id: '1000003'
  alias: S Lampe BRT
  description: ''
  trigger:
  - platform: mqtt
    topic: /Bathroom/Light/BRT
  condition: []
  action:
  - service: light.turn_on
    data:
      brightness: "{{ trigger.payload_json.brightness }}"
    target:
      entity_id: light.s
  mode: single

If the payload received from the ESP is simply an integer value, then use this template:

{{ trigger.payload }}

Reference: Automation Trigger Variables

1 Like
4

Hello Taras,

many thanks for your help, it is working!
Thank you also for the link to the Automation Trigger Values!

For the record, the payload is just a value between 1 and 255, e.g. 187.
No json format.

Do you think it is better to use json for the payload instead onyl the number?

In addition: the Philips Hue bulb is reacting very slowly, sometime they didn’t
react at all. Do you have here any suggestions as well?

Cheers,
Phil

1 Like
5

You’re welcome!

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