One of the first programs you typically write to get used to embedded programming is a sketch that repeatably blinks an LED. IoT projects are wireless, so after completing this section, you'll be able to turn on (or off) the LED built into your board from anywhere in the world.
The Adafruit Feather HUZZAH ESP8266 has a LED (highlighted in red and labeled on the silkscreen as #0) above the Micro-USB port.
On the device page, click the New Component (or "+") button to open the component picker.
From the component picker, select the LED.
On the Create LED Component form, the board's LED pin is pre-selected.
Click Create Component.
Behind the scenes, Adafruit IO sends send a command to your board running WipperSnapper telling it to configure "LED Pin" as a digital output.
Your board's page on Adafruit IO shows a new LED component.
On the board page, toggle the LED component by clicking the toggle switch. This should turn your board's built-in LED on or off.