Home Assistant Auto Color Temperature

automations.yaml

- id: '1704839258272'
  alias: Auto Office Lights
  description: ''
  trigger:
  - platform: state
    entity_id:
    - sensor.auto_kelvin
  - platform: state
    entity_id:
    - binary_sensor.office_occupancy
  action:
  - if:
    - condition: state
      entity_id: binary_sensor.office_occupancy
      state: 'on'
      for:
        hours: 0
        minutes: 0
        seconds: 0
    then:
    - service: light.turn_on
      target:
        entity_id: light.office_lights
      data:
        brightness_pct: '{{ min(80, 30 + ( (states(''sensor.auto_brightness'') |float)
          * 100) |int) }}'
        kelvin: '{{ max(2800, states(''sensor.auto_kelvin'') |int) }}'
    else:
    - service: light.turn_off
      target:
        entity_id: light.office_lights
      data: {}
  mode: single

configuration.yaml

template:
  - sensor:
    - name: Auto Brightness
      state: >
        {# Time the simulated sun rises and sets in my cave. #}
        {% set sunrise = today_at("06:00") %}
        {% set sunset = today_at("19:00") %}

        {% set duration = sunset - sunrise %}
        {% set elapsed = now() - sunrise %}
        {% set deviation = ((max(0, min(1.0, elapsed / duration)) - 0.5) * 2) %}
        {{ '%0.2f' % (1.0 - deviation |abs) }}        

    - name: Auto Kelvin
      unit_of_measurement: "K"
      state: >
        {# Minimum and maximum Kelvin values to return. #}
        {% set min_k = 1000 %}
        {% set max_k = 6000 %}

        {{ (min_k + (max_k - min_k) * (states('sensor.auto_brightness') |float)) |int }}