Control your LED on Arduino UNO using Blynk App.
Use the Blynk app to control the RGB LED, the onboard LED, and the LED expansion from your phone.
Control an external LED light from anywhere in the world using the ESP8266. The GPIO pin serves as an output source to the LED.
This tutorial shows you how to use the RAK Creator pro and Dash button boards with the Blynk web services and app.