Triggering Devices and Building Game Logic with Channels

🎮 What Are We Building?

Imagine a locked treasure room. A player walks up, presses a glowing button, and — boom — a weapon appears AND a door swings open! That's what you'll make today. You'll write Verse code that listens for a button press and then kicks off a whole chain of cool things.

📣 What Is an Event?

An event is like a doorbell. When someone rings it, it tells your house "hey, something happened!" In Fortnite devices, events fire automatically when something occurs in the game — like a player pressing a button or stepping on a trigger pad.

Your Verse code can listen for those doorbells. When one rings, your code wakes up and does something.

🔔 What Is Subscribing?

Subscribing means telling the game: "Hey, whenever THAT doorbell rings, call MY function."

Think of it like signing up for a pizza delivery notification. When the pizza arrives (the event), you get a text (your function runs).

The function you attach is called a handler. It's the code that "handles" what happens when the event fires.

Subscribe(YourHandlerFunction)

🧩 The Button Device: button_device

A Button device is a physical glowing button you place on your island. Players walk up and press E to interact with it.

In Verse, the button has a built-in event called InteractedWithEvent. It fires every time a player presses the button.

Here's how you hook your code to it:

MyButton.InteractedWithEvent.Subscribe(OnButtonPressed)

That one line says: "When the button is pressed, run my function called OnButtonPressed."

📡 What Is a Channel Device?

A channel device (channel_device) is like a walkie-talkie for your devices. One device talks (transmits a signal), and any other device that's listening hears it and reacts.

• Transmit() — this is the "talk" button. It sends a signal out.
• ReceivedTransmitEvent — this is the "listen" side. Other code can subscribe to this to hear the signal.

You can chain devices together like dominoes! Button press → channel transmits → door opens. 🎉

🏗️ How to Set Up Your Devices in UEFN

Before writing code, you need to place these devices on your island:

1. 🟡 Button device — the thing the player presses.
2. 📦 Item Spawner device — drops a weapon or item when told to.
3. 📡 Channel device — the relay that sends signals to other devices.
4. 🔲 Mutator Zone or Timer device (optional, for extra challenge) — can react to the channel signal.

Tip: Use @editable in your Verse code so you can drag-and-drop the real devices into the slots in the UEFN editor. This connects your code to the actual devices on the island!

🔑 Key Words Cheat Sheet