Assume you have a button that you want to monitor, you can set up an alert or notification to be sent when the button is pressed. Alternatively, you could set up an automation rule to turn off another device when the button is pressed.

If one of those examples was your situation, Controller Trigger might be your choice.

This type of automation is used when your device controller is triggered, and another action is expected to occur.

When you choose this type, you just need to give a name and the description for your rule, then click Next.  

On the next step, you need to set which device’s controller that would be the trigger. You also need to set the condition of your rule.  

Click Add Trigger to select your device. Then, click on the Device dropdown menu to search your device.

A little note: If you choose on the device that having no controller, there will be no list of controllers to shown. So, make sure your device has a controller. 

After choosing your device, you must specify which controller will act as a trigger at Controller dropdown menu. You could select more than one controller, and each controller will be linked with an OR relation.

The Condition will be equal (=), which means that the trigger will be sent when the Action reaches the value. The Action value is On or Off. 

Click Add Trigger when done.