Book Image

Programming the BeagleBone

By : Yogesh Chavan, Amit Pandurang Karpe
Book Image

Programming the BeagleBone

By: Yogesh Chavan, Amit Pandurang Karpe

Overview of this book

The whole world is moving from desktop computers to smartphones and embedded systems. We are moving towards utilizing Internet of Things (IoT). An exponential rise in the demand for embedded systems and programming in the last few years is driving programmers to use embedded development boards such as Beaglebone. BeagleBone is an ultra-small, cost-effective computer that comes with a powerful hardware. It runs a full-fledged Debian Linux OS and provides numerous electronics solutions. BeagleBone is open source and comes with an Ethernet port, which allows you to deploy IoT projects without any additions to the board. It provides plenty of GPIO, Anlaog pins, and UART, I2C, SPI pins which makes it the right choice to perform electronics projects. This gives you all the benefits of Linux kernel such as multitasking, multiusers, and extensive device driver support. This allows you to do programming in many languages including high-level languages such as JavaScript and Python. This book aims to exploit the hardware and software capabilities of BeagleBone to create real-life electronics and IoT applications quickly. It is divided into two parts. The first part covers JavaScript programs. The second part provides electronics projects and IoT applications in Python. First, you will learn to use BeagleBone as tool to write useful applications on embedded systems. Starting with the basics needed to set up BeagleBone and the Cloud9 IDE, this book covers interfacing with various electronics components via simple programs. The electronics theory related to these components is then explained in depth before you use them in a program. Finally, the book helps you create some real-life IoT applications.

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Programming the BeagleBone
Yogesh Chavan | Amit Pandurang Karpe
Jan, 2016 | 180 pages
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Table of Contents (21 chapters)
Programming the BeagleBone
Programming the BeagleBone
Credits
Credits
About the Author
About the Author
Acknowledgment
Acknowledgment
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Cloud9 IDE
Cloud9 IDE
BeagleBone hardware
Installing Debian image on SD card
Setting up BeagleBone
The bone101 page
Cloud9 IDE
Hello World program
Summary
2
Blinking Onboard LEDs
Blinking Onboard LEDs
Digital I/O
Digital I/O functions - pinMode() and digitalWrite()
Program to turn onboard LED ON and OFF
Quick program to blink onboard LED
Make our program better
Dancing LEDs
Dancing LEDs in both directions
Summary
3
Blinking External LEDs
Blinking External LEDs
What is GPIO?
BeagleBone GPIO map
Blinking external LED circuit setup
Program to blink external LED
Dancing external LEDs circuit setup
Program to dance external LEDs in both directions
Summary
4
Controlling LED Using a Push Button
Controlling LED Using a Push Button
Reading from digital components
Push button circuit setup
Program to read from push button
Reading via interrupts
Push button LED circuit setup
Program to control LED by push button
Summary
5
Reading from Analog Sensors
Reading from Analog Sensors
Analog I/O
Reading from analog components
TMP36 temperature sensor circuit setup
Program to print temperature
LDR circuit setup
Program to check light intensity
Summary
6
PWM – Writing Analog Information
PWM – Writing Analog Information
What is PWM?
BeagleBone's PWM
Writing on analog components
Fading LED circuit setup
Program to fade in and fade out LED
Micro servo motor circuit setup
Program to control a micro servo motor
Summary
7
Internet of Things with BeagleBone
Internet of Things with BeagleBone
Why the Internet of Things?
What is the Internet of Things?
Program for creating new Node.js HTTP server
Program to control an LED through web browser
Controlling a servo motor through LAN
Sending an e-mail on over-temperature
Summary
8
Physical Computing in Python
Physical Computing in Python
Python programming in BeagleBone
Program to blink external LEDs
Program to dance external LEDs
Program to read from push button
Program to print temperature
A Program to check light intensity
Program to fade in and fade out LED
Program to control micro servo motor
Summary
9
UART, I2C, and SPI Programming
UART, I2C, and SPI Programming
Bus and bus protocols
What is UART?
Program to read/write on UART
I2C protocol
Program to read from ADXL345 sensor
SPI protocol
Program to write display text on Nokia 5110 LCD
Summary
10
Internet of Things using Python
Internet of Things using Python
Flask web application framework
A program to display temperature remotely
A program to control an LED through a web browser
A RESTful web app to control servo motor
A program to trigger an e-mail alert on over-temperature
Upload server data on cloud and visualize
What's next?
Security
Summary
GPIO Control in Bash
GPIO Control in Bash
Explanation
Troubleshooting
BeagleBone Capes
BeagleBone Capes
Pinmux and the Device Tree
Pinmux and the Device Tree
What is Pinmux?
What is the device tree?
Index
Index

Program to control LED by push button

Write the following code in it and save it as pushButton2.js. Run the program, keep button pressing and releasing. You should see the LED glowing when the button is pressed. When the button is released, the LED should be turned off.

var b = require('bonescript');
var inputPin = 'P8_16';
var outputPin = 'P8_10';

b.pinMode(inputPin, b.INPUT);
b.pinMode(outputPin, b.OUTPUT);
b.attachInterrupt(inputPin, true, b.CHANGE, interruptCallback);
var exitTimer = setTimeout(exitProgram, 60000);

function interruptCallback(pinObj)
{
  if(pinObj.value==b.HIGH)
  {
    b.digitalWrite(outputPin, b.HIGH);
  }
  else
  {
    b.digitalWrite(outputPin, b.LOW);
  }
}

function exitProgram()
{
  b.digitalWrite(outputPin, b.LOW);
  b.detachInterrupt(inputPin);
  console.log('Interrupt detached');
}

Explanation

We are using GPIO pin P8_16 as input from the push button and P8_10 as output to the LED. Then we attached interrupt on GPIO input pin P8_16 for the event CHANGE in current...

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