In the previous recipe, we learned how to set up the development environment. Now, let's compile and run our first program.

The Arduino UNO board itself does not have a screen, but we need some way to know that our program is doing something. It does, however, have a built-in LED that we can control from our program without connecting any peripherals to the board.

In this recipe, we will learn how to compile and run a program that blinks a built-in LED on an Arduino UNO board.