When you open up the Arduino IDE, it will look very similar to the image in Figure 1-13. If you are using Windows or Linux, there may be some slight differences but the IDE is pretty much the same no matter what OS you use.
Figure 1-13. What the IDE looks like when the application opens
The IDE is split into three parts: the Toolbar across the top, the code or Sketch Window in the center, and the messages window in the bottom. The Toolbar consists of seven buttons. Underneath the Toolbar is a tab, or set of tabs, with the filename of the sketch within the tab. There is also one button on the far right hand side.
Along the top ...