How to set up a virtual 3 way between 2 master switches?

SmartApps & Automations Automation Ideas
2

I assume you have the downstairs switch wired up with no load attached. You can use SmartLighting for this by creating two automations:

  1. Control Switch 1, Mirror Behavior, Mirror Switch 2.
  2. Control Switch 2, Mirror Behavior, Mirror Switch 1.

This means that if you turn on switch 1, switch 2 also turns on, and vice versa; I believe it will also mirror dim levels but I’ve never tried that, maybe someone else can confirm.

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