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

Multiplexing LEDs

The concept of multiplexing is an interesting and efficient one. It is the key to having a bunch of peripherals connected to our Arduino boards.

Multiplexing provides a way to use few I/O pins on the board while using a lot of external components. The link between Arduino and these external components is made by using a multiplexer/demultiplexer (also shortened to mux/demux).

We spoke about input multiplexing in Chapter 6, Playing with Analog Inputs.

We are going to use the 74HC595 component here. Its datasheet can be found at

This component is an 8-bit serial-in / serial-or-parallel-out. This means it is controlled through a serial interface, basically using three pins with Arduino and can drive with eight of its pins.

I'm going to show you how you can control eight LEDs with only three pins of your Arduino. Since Arduino Uno contains 12 digital usable pins (I'm not taking 0 and 1, as usual), we can easily imagine using...