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Raspberry Pi IoT In C
Paperback
ISBN13: 9781871962468
Publisher: Lightning Source Inc
Published: Oct 2 2016
Pages: 294
Weight: 1.12
Height: 0.62 Width: 7.52 Depth: 9.25
Language: English
Second Edition Now Available.
The Raspberry Pi makes an ideal match for the Internet of Things. But to put it to good use in IoT you need two areas of expertise, electronics and programming and because of the way hardware and software engineering tend to occupy separate niches you may need help with combining the two. This book teaches you to think like an IoT programmer.
In Raspberry Pi IoT in C you will find a practical approach to understanding electronic circuits and datasheets and translating this to code, specifically using the C programming language. The main reason for choosing C is speed, a crucial factor when you are writing programs to communicate with the outside world. If you are familiar with another programming language, C shouldn't be hard to pick up. Here it is used in conjunction with NetBeans and with the bcm2835 library.
The main idea in this book is to not simply install a driver, but to work directly with the hardware. So rather than using Raspberry Pi HATs or other expansion boards we use the Pi's GPIO (General Purpose Input Output) and connect off-the-shelf sensors. If you want to know how to work with the GPIO lines directly, how to work with near realtime Linux and generally take control of the Pi this is the book you need. It explains how to use the standard bus types - SPI, I2C, PWM - and with custom protocols including an in-depth exposition of the 1-wire bus. You will also discover how to put the Internet into the IoT using sockets and the low cost ESP8266.
After reading this book you will be in a better position to tackle interfacing anything-with-anything without the need for custom drivers and prebuilt hardware modules.
Having written a Blinky program to check that everything we need is installed and working we move on to exploring the basics of using the GPIO and also master memory mapping, pulse width modulation and other more sophisticated bus types. From here we can start connecting sensors, which is a core requirement for IoT. First we'll meet the ubiquitous I2C bus, next we'll implement a custom protocol for a one-wire bus, and eventually we'll add eight channels of 12-bit AtoD with the SPI bus, which involves overcoming some subtle difficulties. Next we look at the traditional serial interface how to use it to communicate with other devices. This paves the way for getting the Pi on the web - after all this is a book about the Internet of Things -using first a USB WiFi adapter and sockets and then the low cost ESP8266, which is particularly useful with the Pi Zero which has only one USB port. Having transformed the Pi into both a web client and a web server we can then use them to exchange information.
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