# How to control multiple dimmers with only one dimmer

**URL:** <https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356>\
**Category:** Flows\
**Tags:** advancedflow\
**Created:** [August 17, 2023, 9:19pm UTC](https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356 "2023-08-17T21:19:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Robert\_Homey](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robert_homey/32/79549_2.png) [@Robert\_Homey](https://community.homey.app/u/Robert_Homey)\
**Post date:** [August 17, 2023, 9:19pm UTC](https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356/1 "2023-08-17T21:19:11Z")

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Hi

I have some rotary dimmers that are from the same manufacture, and I would like to control the output from these dimmers with the use of only one dimmer. (I turn on the “master” dimmer and adjust the output power, i would like the other dimmers to have the same output) How is this done in advanced flow?

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [August 17, 2023, 10:49pm UTC](https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356/2 "2023-08-17T22:49:30Z")

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You could group the dimmers f.i. using the [Device Capabilities app](https://community.homey.app/t/app-pro-advanced-virtual-device-device-capabilities-app-with-unique-text-status-indicator/68198).  
When any dimmer is changed, they all follow and get the same value, when the ‘Calculation’ is set to “Mean”

 ![Screenshot from 2023-08-17 23-44-27](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/b/d/bdd6016be6830ea1c5702a2e1583501a1c8dbd72.png)  
 ![Screenshot from 2023-08-17 23-44-56](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/b/9b4c33994f2e93eb109e23041accf409366e0c92.png)

Note: the “BLL Expression” is cut-off in the screeny, it is `Math.round($value*100)`

When you want a Lead/Follow setup, use the main dimmer to set the dim value of the grouped dimmers

 ![Screenshot from 2023-08-18 00-37-32](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/c/a/ca9f56318cb7c40b86cdb98f22d69e7406a19517.png)

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**Author:** ![Adrian\_Rockall](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/adrian_rockall/32/13209_2.png) [@Adrian\_Rockall](https://community.homey.app/u/Adrian_Rockall)\
**Post date:** [August 18, 2023, 8:29am UTC](https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356/3 "2023-08-18T08:29:17Z")

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You could also use the group app.  
Or just create a Flows to trigger when the master on/off and/or dim level changes and send the same to the other dimmers.

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**Author:** ![Robert\_Homey](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robert_homey/32/79549_2.png) [@Robert\_Homey](https://community.homey.app/u/Robert_Homey)\
**Post date:** [August 18, 2023, 1:50pm UTC](https://community.homey.app/t/how-to-control-multiple-dimmers-with-only-one-dimmer/87356/4 "2023-08-18T13:50:42Z")

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Thanks. This worked for me.