In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The alert mechanism occurs in the new function called sendTempAlert that is called if the temperature is below the limit."

A block of code is set as follows:

[default]
String data = "";
data = data + timeString + "," + String(temperature) + "," + String(humidity) + "," + String(lightLevel);

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
if (client) {
  // Process request
  process(client);

  // Close connection and free resources.
  client.stop();
}

Any command-line input or output is written as follows:

# http://myarduinoyun.local/arduino/digital/8/1

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes, for example, appear in the text like this: "Just click on interface.html, and the interface should open and be scaled to your phone screen size."