Syncing WLED controllers allows your controllers to work together. I have three different controllers setup. One is the main, and two listen for changes.

I assume you’ve already connected all your controllers to the same network, and they’re all up and running. If not, do that first.

Now, go into the one you want as the main controller and go into config > sync interfaces. In the sync group section, choose a group number. I chose 2, but you don’t have to. Then ensure Send is checked and Receive is unchecked. Leave the rest of the settings as they are and Save.

Go back out to the main screen and turn on the Sync button. This will tell it to send out the signal to anyone listening. It has to remain on.

Next, go to your other controllers and go to config > sync interfaces. In the sync groups, set them to Receive the same group number as you set on the main controller.

That should do it. They should turn on, off, change colors, and effects based on the main controller.

Sometimes, out of the three that I’m syncing, one doesn’t always listen. It’ll be right 90% of the time, but every so often, one doesn’t change when it should. This can happen if there is WIFI interference. You can help avoid this by going back into the main controller, to config > sync setup. Scroll down to UDP packet retransmissions. Change it to 2 or 3. This will tell the main controller to repeat the config change notification so that if anyone didn’t get the first update notification, maybe they’ll get the second, or third. You can set this number to whatever you want, but I’ve never gone higher than 3.

That’s all you have to do. Your WLED controllers should now be in sync.