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
About the Author
About the Reviewers

Mastering bit shifting

There are two bit shift operators in C++:

  • << is the left shift operator

  • >> is the right shift operator

These can be very useful especially in SRAM memory, and can often optimize your code. << can be understood as a multiplication of the left operand by 2 raised to the right operand power.

>> is the same but is similar to a division. The ability to manipulate bits is often very useful and can make your code faster in many situations.

Multiplying/dividing by multiples of 2

Let's multiply a variable using bit shifting.

int a = 4;
int b = a << 3;

The second row multiplies the variable a by 2 to the third power, so b now contains 32. On the same lines, division can be carried out as follows:

int a = 12 ;
int b = a >> 2;

b contains 3 because >> 2 equals division by 4. The code can be faster using these operators because they are a direct access to binary operations without using any function of the Arduino core like pow() or even the other...