I have a room (garage) with a wall in the middle but one set of lights. To cover all areas and doors i need two (or maybe three) motion detectors (PIR). Turing on lights is straight forward but how to create a flow that turn of lights if neither sensor has detected motion within x minutes? Just creating one flow for each sensor obviously doesn’t work.
Maybe you can use Zone Activity? Make sure all sensors are in the same Zone, and then use the trigger Flowcard “This zone has been inactive for 5 minutes”
I guess if they were in the same zone. Different zones because of other settings (two garage doors, etc).
You can also create 2 subzones in 1 “Garage” zone. Then you have zone “Door 1” and zone “Door 2” inside zone “Garage”. In this case, you can trigger the Flow based on “Garage” zone activity
As You asked about flow, i answer 'bout that 
( actually, i think, the Zone will also work )
In activity You need a (count down) timer - there is couple of timer apps in store.
When some of motion detectors trigger, flow just set’s the count down timer to Your “all gone” value. When count-down reaches to zero - switch lights off. And that’s all.
If there is little bit longer business in garage, then each next movement set’s timer and it does not reach zero till all gone from garage.
NB! One thing, You must check with PIR settings - some of them like to stay in triggered mode until total activity in range is ended => we do not get additional ( still active) alarms. In such case You can manage settings OR build activity so, that:
- Every alarm from PIR(s) set’s lights on
- Every “alarm off” event from any PIR checks, if there is any active PIR. If not, then switches the lights off
