I’ve been diving into the world of MQTT integrations lately, and I must say, it’s been a fascinating journey! One of my recent projects has been setting up a custom MQTT dimmer using an input_slider in Home Assistant. While the concept seemed straightforward, the execution turned out to be a bit of a puzzle. Let me walk you through my experience and the eventual solution I found.
Initially, my goal was to create a seamless dimmer control that integrates perfectly with my existing MQTT setup. I wanted to avoid the default behavior where setting the brightness also sends an “on” payload, which wasn’t ideal for my specific use case. So, I decided to roll up my sleeves and tackle this head-on.
Here’s the code I started with:
yaml
MQTT DIMMER 1
automation:
alias: ‘MQTT Input Slider Dimmer1’
trigger:
platform: state
entity_id: input_slider.slider1
action:
service: mqtt.publish
data_template:
topic: kitchen/dimmer1/brightness/set
payload: {{ states.trigger.new_state }}
I experimented with various payload configurations, but nothing seemed to work. Frustration set in as I encountered error after error. The payload attempts included:
payload: {{ trigger.new_state }}payload: {{ states.input_slider.slider1 }}payload: {{ states(trigger.new_state) }}payload: {{ states(input_slider.slider1) }}
Each attempt led to the same cryptic error message, which I couldn’t make sense of at the time. The traceback pointed to an issue with the YAML configuration, but I couldn’t pinpoint the exact problem. Was it a syntax error? Or perhaps an incorrect state reference? I decided to dig deeper into the Home Assistant documentation and community forums for clues.
After hours of troubleshooting, I realized the issue lay in how I was referencing the state. The states(trigger.new_state) syntax wasn’t the right approach. Instead, I needed to access the state of the input_slider directly. Here’s the corrected code that finally worked:
yaml
MQTT DIMMER 1
automation:
alias: ‘MQTT Input Slider Dimmer1’
trigger:
platform: state
entity_id: input_slider.slider1
action:
service: mqtt.publish
data_template:
topic: kitchen/dimmer1/brightness/set
payload: ‘{{ states.input_slider.slider1.state }}’
The key change was using {{ states.input_slider.slider1.state }} to correctly reference the state of the input_slider. This ensured that the payload sent to my MQTT broker was the actual brightness value, without any unintended side effects.
This experience taught me the importance of carefully reviewing state references and understanding how variables are accessed in templates. It also highlighted the value of community resources and documentation when facing challenges in Home Assistant configurations.
If anyone else is tackling a similar project or遇到类似的挑战, I’d love to hear your approaches and solutions! Let’s continue to learn and grow together in the world of smart home automation.