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Almost all operating systems come with a text editor preinstalled (for example,
Windows comes with Notepad, Linux Ubuntu comes with Gedit, Linux Raspbian
comes with Leafpad, etc.). All of these text editors are perfectly fine for the
purpose of the eBook.
Next thing is to check if your PC can detect an Arduino board. Open freshly
installed Arduino IDE, and go to:
Tools > Board > {your board name here}
{your board name here} should be the Arduino/Genuino Uno, as it can be seen on
the following image:
The port to which the Arduino board is connected has to be selected. Go to:
Tools > Port > {port name goes here}
and when the Arduino board is connected to the USB port, the port name can
be seen in the drop-down menu on the previous image.