Programming the BeagleBone

Programming the BeagleBone

By : Yogesh Chavan, Amit Pandurang Karpe

Buy this Book

Programming the BeagleBone

By: Yogesh Chavan, Amit Pandurang Karpe

Buy this Book

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.

Programming the BeagleBone

Credits

About the Author

Acknowledgment

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Cloud9 IDE

BeagleBone hardware

Installing Debian image on SD card

Setting up BeagleBone

The bone101 page

Cloud9 IDE

Hello World program

Summary

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

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

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

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

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

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

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

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

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

Explanation

Troubleshooting

BeagleBone Capes

Pinmux and the Device Tree

What is Pinmux?

What is the device tree?

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Program to print temperature

We learned about analog theory and BeagleBone's special analog input pins in Chapter 5, Reading from Analog Sensors. In that chapter, we read the temperature from the TMP36 sensor. Let's write a Python program to do the same.

Connect the TMP36 sensor to P9_40 as shown in the diagram in Chapter 5. Type the following program in Cloud9, save it as TMP36.py and run. It will print the current temperature in degrees Celsius. If you touch the sensor, you will see an increase in temperature.

This is the code for TMP36.py:

#!/usr/bin/python
import Adafruit_BBIO.ADC as ADC
from time import sleep

tmp36 = "P9_40"

ADC.setup()

while True:
    volts = ADC.read(tmp36)* 1.8
    ##Equation created after reading TMP36 datasheet
    temperature = (volts*100) - 50
    print "Current Temperature is " + str(round(temperature,2))
    sleep(1)

Explanation

This time we took the ADC namespace from the BBIO library. This namespace has variables and functions related to analog input. Function...

Programming the BeagleBone

By : Yogesh Chavan, Amit Pandurang Karpe

Programming the BeagleBone

By: Yogesh Chavan, Amit Pandurang Karpe

Overview of this book

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Programming the BeagleBone

Program to print temperature

Explanation