Dim Hue Lights with KNX Push Button

The following example is from a Gira KNX push button. For other manufacturers, the parameters will not be exactly the same, but most likely sufficiently similar that the configuration can be derived from the instructions.

ETS configuration Gira push button

KNX devices allow a wide range of configuration options. The selected configuration should allow the following:

• I would like to switch ON and OFF with the same button and dim with a long button press -> Command on pressing
• I want to use a KNX push button in DIM mode -> Function
• I would like to have the status displayed via the LED integrated in the push button -> status LED

ETS association Gira push button sensor 4

The communication objects are connected as follows:

1. The group address to which the push button transmits ON/OFF GF Living Room Ceiling Hue On/Off is connected to the communication object output – Switching
2. The group address to which the push button transmits DIM GF Living Room Ceiling Hue Dim is connected to the communication object output – Dimming 
3. The group address to which the push button transmits the status GF Living Room Ceiling Hue On/Off Feedback is connected to the communicaiton object input– Switching Feedback

Check if the flags are set (see Switch Hue Light over KNX Push Button).

Documentation: Home Assistant Blueprints

The Hue Bridge processes commands every second. This is too slow to forward the KNX Dim commands (DPT 3.007 Dimmer Step) directly. Therefore two states are defined in the Blueprint:

Initial Value: Brightness when switching on

Dimmed Value: Brightness during dimming

Switching on or Dim Up sets the Initial Value. Dim Down sets the Dimmed Value.

Any dimmable lights can be used as the light entity. I recommend to use the Philips Hue Zone (background see: Switch Hue Light over KNX Push Button).

Create a new automation in Home Assistant and select this Blueprint as a template:

The original idea for this Blueprint comes from farmio (github: knx-relative-dimming-for-lights.yaml).

The state of the Hue lights can be changed not only via Home Assistant, or the KNX button, but also via the Hue app. In order for this change to be forwarded to the KNX push button, the Expose function is required. Home Assistant documentation: Expose Entity State.

# ---------------- Hue Status to KNX group address --------------
knx:
  expose:
    # For KNX push buttons with switching and feedback communication object
    - type: 'binary'
      entity_id: 'light.gf_living_room_ceiling_hue'
      address: "2/0/2"