# Switch on/off knx dimmer

**URL:** <https://community.homey.app/t/switch-on-off-knx-dimmer/106427>\
**Category:** Apps\
**Tags:** homey-pro\
**Created:** [March 16, 2024, 4:58pm UTC](https://community.homey.app/t/switch-on-off-knx-dimmer/106427 "2024-03-16T16:58:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Marcel\_Ravenshorst](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/marcel_ravenshorst/32/78133_2.png) [@Marcel\_Ravenshorst](https://community.homey.app/u/Marcel_Ravenshorst)\
**Post date:** [March 16, 2024, 4:58pm UTC](https://community.homey.app/t/switch-on-off-knx-dimmer/106427/1 "2024-03-16T16:58:38Z")

</div>

Hello,

I searched all topics on KNX app, but cannot find a solution for my maybe simple problem.

I have installed KNX IP interface, homey-pro can find it. I have loaded my ETS project, and Incan select all my devices and addresses.

I selected all the right addresses (also from my Domovea application) for switching on/off status, dimmer status, etc.

When I physically turn on the light, I can see in Homey it is turned on. Also when I change the dim % it is shown in Homey KNX app.

I can only not switch the light on or of, or change the dim % via the KNX app in Homey.

Should I use another group address then the one for the device (light) ?

Hope someone can help me further.

Marcel