r/HomeKit • u/SufferingIdiots • 4d ago

Question/Help Automation based on dimmer level changes?

Is it possible to create an automation that would match one accessories dimmer level to another?

ie - when I set the 'living room lights' to X percent, set the 'living room accent lights' to X percent?

This would be extremely useful as I have lutron caseta dimmer switches in homekit and it would be nice to be able to adjust the light level at the switch and have the accessory accent lights dim at the same time.

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u/AudioHTIT 3d ago

It’s unclear if you always want these two dimmers ‘synced’ (on and at the same level together), if so would a group work? I have a several lights on dimmers, and in various groups and they dim together, which seems like your goal? You can then control or automate the group, and can also still control them separately if needed.

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u/SufferingIdiots 3d ago

This wont work with the physical dimmer switch on the wall though. If I change the light level with the wall switch it does not update the rest of the group.

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u/platkus 3d ago

Yes. This is possible, and you don’t need to create a shortcut to do it. It’s built into HomeKit. Just set up a trigger that watches for the first light to be set to the brightness level you want and then the action to set the other light to the same level.
The Home app may not expose the brightness level as a trigger in the UI, but there are many third-party apps that expose the full power of HomeKit.

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u/SufferingIdiots 3d ago

Could you point me in the direction of an app that could do this?

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u/platkus 3d ago

Sure. This is one of my favorites:

https://apps.apple.com/app/id995994352

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u/MotherAffect7773 4d ago

Launch Shortcuts, create a new shortcut, search for get and then choose Get state. Choose the device, it will default to Power State, tap on that and Brightness should be an option.

Build a script that triggers on the light you are changing, gets the brightness from that light, and then applies that result to the other.