Book Image

C Programming for Arduino

By : Julien Bayle
Book Image

C Programming for Arduino

By: Julien Bayle

Overview of this book

Physical computing allows us to build interactive physical systems by using software & hardware in order to sense and respond to the real world. C Programming for Arduino will show you how to harness powerful capabilities like sensing, feedbacks, programming and even wiring and developing your own autonomous systems. C Programming for Arduino contains everything you need to directly start wiring and coding your own electronic project. You'll learn C and how to code several types of firmware for your Arduino, and then move on to design small typical systems to understand how handling buttons, leds, LCD, network modules and much more. After running through C/C++ for the Arduino, you'll learn how to control your software by using real buttons and distance sensors and even discover how you can use your Arduino with the Processing framework so that they work in unison. Advanced coverage includes using Wi-Fi networks and batteries to make your Arduino-based hardware more mobile and flexible without wires. If you want to learn how to build your own electronic devices with powerful open-source technology, then this book is for you.
Table of Contents (21 chapters)
C Programming for Arduino
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Index

The scope concept


The scope can be defined as a particular property of a variable (and functions, as we'll see further). Considering the source code, the scope of a variable is that part of the code where this variable is visible and usable.

A variable can be global and then is visible and usable everywhere in the source code. But a variable can also be local, declared inside a function, for instance, and that is visible only inside this particular function.

The scope property is implicitly set by the place of the variable's declaration in the code. You probably just understood that every variable could be declared globally. Usually, I follow my own digital haiku.

Note

Let each part of your code know only variables that it has to know, no more.

Trying to minimize the scope of the variables is definitely a winning way. Check out the following example:

// this variable is declared at the highest level, making it visible everywhere
int globalString;

void setup(){
  // … some code
}
void loop(){...