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

Sensing analog inputs and continuous values


There's no better way to define analog than by comparing it to digital. We just talked about digital inputs in the previous chapter, and you now know well about the only two values those kind of inputs can read. It is a bit exhausting to write it, and I apologize because this is indeed more a processor constraint than a pure input limitation. By the way, the result is that a digital input can only provide 0 or 1 to our executed binary firmware.

Analog works totally differently. Indeed, analog inputs can continuously provide variable values by measuring voltage from 0 V to 5 V. It means a value of 1.4 V and another value of 4.9 V would be interpreted as totally different values. This is very different from a digital input that could interpret them as…1. Indeed, as we already saw, a voltage value greater than 0 is usually understood as 1 by digital inputs. 0 is understood as 0, but 1.4 would be understood as 1; this we can understand as HIGH, the...