KNX - relative dimming for lights blueprint

knx-relative-dimming-for-lights.yaml

blueprint:
  name: KNX - relative dimming for lights
  description: Controll Home Assistant Light entities from KNX switching and relative dimming (DPT 3.007) telegrams.
  domain: automation
  input:
    target_lights:
      name: Light
      description: The lights that shall be controled.
      selector:
        target:
          entity:
            domain: light
    switch_address:
      name: Switch group address
      description: >
        Group address for switching the lights on and off. DPT 1
        Example: '1/2/3'
    dimm_address:
      name: Relative dimming address
      description: >
        Group address for dimming the lights. DPT 3.007
        Example: '1/2/4'
    dimm_time:
      name: Dimm time
      description: Time dimming from 0 to 100% shall take.
      selector:
        number:
          min: 1
          max: 20
          step: 0.1
          unit_of_measurement: seconds
          mode: slider
      default: 4
    dimm_steps:
      name: Dimm steps
      description: Steps used to dimm from 0 to 100%.
      selector:
        number:
          min: 2
          max: 100
          step: 1
          unit_of_measurement: steps
          mode: slider
      default: 20

# no matched condition stops repeat sequence to stop dimming (dimm 0)
mode: restart
max_exceeded: silent

variables:
  _dimm_time: !input dimm_time
  _dimm_steps: !input dimm_steps
  dimm_time: "{{ _dimm_time|float }}"
  dimm_steps: "{{ _dimm_steps|int }}"
  dimm_step: "{{ (255 / dimm_steps) | round(0, 'ceil') }}"
  dimm_delay: "{{ dimm_time * 1000 / dimm_steps }}"


trigger:
  - platform: homeassistant
    event: start
    id: "initialize"
  - platform: event
    event_type: automation_reloaded
    id: "initialize"
  # when KNX integration was reloaded
  - platform: event
    event_type: service_registered
    event_data:
      domain: knx
      service: event_register
    id: "initialize"
  - platform: event
    event_type: knx_event
    event_data:
      destination: !input switch_address
      telegramtype: GroupValueWrite
    id: "switch"
  - platform: event
    event_type: knx_event
    event_data:
      destination: !input dimm_address
      telegramtype: GroupValueWrite
    id: "dimm"

action:
  - choose:
    # TURN ON
    - conditions:
        condition: and
        conditions:
          - condition: trigger
            id: "switch"
          - "{{ trigger.event.data.data == 1 }}"
      sequence:
        - service: light.turn_on
          target: !input target_lights
    # TURN OFF
    - conditions:
        condition: and
        conditions:
          - condition: trigger
            id: "switch"
          - "{{ trigger.event.data.data == 0 }}"
      sequence:
        - service: light.turn_off
          target: !input target_lights
    # DIMM UP
    - conditions:
        condition: and
        conditions:
          - condition: trigger
            id: "dimm"
          - "{{ 9 <= trigger.event.data.data <= 15 }}"
      sequence:
        - repeat:
            count: '{{ dimm_steps }}'
            sequence:
              - service: light.turn_on
                target: !input target_lights
                data:
                  brightness_step: '{{ dimm_step }}'
              - delay:
                  milliseconds: '{{ dimm_delay }}'
    # DIMM DOWN
    - conditions:
        condition: and
        conditions:
          - condition: trigger
            id: "dimm"
          - "{{ 1 <= trigger.event.data.data <= 7 }}"
      sequence:
        - repeat:
            count: '{{ dimm_steps }}'
            sequence:
              - service: light.turn_on
                target: !input target_lights
                data:
                  brightness_step: '{{ -dimm_step }}'
              - delay:
                  milliseconds: '{{ dimm_delay }}'
    # INITIALIZE
    - conditions:
        condition: trigger
        id: "initialize"
      sequence:
        - service: knx.event_register
          data:
            address: !input switch_address
        - service: knx.event_register
          data:
            address: !input dimm_address

Updated for accepting different step codes. Step codes are not evaluated, only control bit.

Great job, it works for entities! If I have to replace a hue light bulb, the automation must be updated with the new entity. I suppose it's because the entity_list is used... would it be possible to add a "device_list" or "area_list" too? If an area is used, a new hue bulp must only be set to the correct room (in the hue app) no update of the automation is needed.

@kruzgix Hi!
Im not very familiar with either devices nor areas (don't have either of them in my installation), but for this blueprint to work the targets have to be of domain light which I think wouldn't work with an area.

If you had to replace a physical device you can then just assign it the entity_id of the old light so all previous automations stay intact.

Another way could be to use a light_group which, afaik behaves like a light entity.

Hi, I'm referencing to the light section of the automation in home assistant, it's possible to pick an entity, device or area (see sreenshot)

@kruzgix Hi 👋!
Areas should work properly now.
The blueprint also keeps working when the KNX integration was reloaded.

Hi, it works well, but how does it work with the state adress?
I don't get that.
Or do you need to expose it seperatly?
Thanks in advance.

@Reteip10 right, use expose. This blueprint only has one-way communication.
Or fork the blueprint and add it 😉

What about controlling color_temp for tunable white bulbs? Did you happen to implement it before?

I guess it would work the same way as brightness - so you may just fork it and add the options you need for your installation.

hm, but color_temp only accepts mirads as input, not steps. I think we need to convert it somehow.

Depends on the actuator, I guess. The ones I know support DPT 3 color temp dimming, just like brightness.
And HA supports Kelvin too, so no need to deal with Mireds afaic.

Yeah, kelvin should be fine for Phillips Finance white