WLED's HTTP API allows you to set many properties of your lights, even more than the index page UI supports, via a simple GET web request. Unsure how all this API stuff works? Check out this amazing ...

Starting from version 0.8.4, WLED implements a powerful JSON API over HTTP. It is accessable using the /json subpage. transition 0 to 255 Duration of the crossfade between different colors/brightness ...