Eaton

I use Eaton dimmers for my lights and I want to use the Homey to put the light on/off.
How can I do that?

Someone, or maybe you, should create an app for these devices.

Depends of what type EATON devices you have, if it’s the old X10 types, you can use the app:
https://apps.athom.com/app/com.jilles.x10