This is Cool! Imagine the tangible interaction you can create by having one or more LEDs in the real world animate in a way that matches the virtual world.
This video shows a simple Unity UI controlling LED brightness in a step-by-step tutorial and we play with different brightness values.
And because we have additional actions for PlayMaker (Hutong Games sells PlayMaker on the Unity Asset Store), we can do this project with no code at all.
Kreation.Arduino.Playmaker is available on the Unity Asset Store and sales support ongoing development.
https://assetstore.unity.com/packages...