Book Image

Raspberry Pi 3 Projects for Java Programmers

By : Rajdeep Chandra, John Sirach, Pradeeka Seneviratne
Book Image

Raspberry Pi 3 Projects for Java Programmers

By: Rajdeep Chandra, John Sirach, Pradeeka Seneviratne

Overview of this book

Raspberry Pi is a small, low cost and yet very powerful development platform. It is used to interact with attached electronics by the use of it's GPIO pins for multiple use cases, mainly Home Automation and Robotics. Our book is a project-based guide that will show you how to utilize the Raspberry Pi's GPIO with Java and how you can leverage this utilization with your knowledge of Java. You will start with installing and setting up the necessary hardware to create a seamless development platform. You will then straightaway start by building a project that will utilize light for presence detection. Next, you will program the application, capable of handling real time data using MQTT and utilize RPC to publish data to adafruit.io. Further, you will build a wireless robot on top of the zuma chassis with the Raspberry Pi as the main controller. Lastly, you will end the book with advanced projects that will help you to create a multi-purpose IoT controller along with building a security camera that will perform image capture and recognize faces with the help of notifications. By the end of the book, you will be able to build your own real world usable projects not limited to Home Automation, IoT and/or Robotics utilizing logic, user and web interfaces.

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Table of Contents (8 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
Setting up Your Raspberry Pi
Setting up Your Raspberry Pi
Getting started with the Raspberry Pi
Installing Raspbian
Installing Java
Installing and preparing the NetBeans Java editor
Our first remote Java application
Summary
2
Automatic Light Switch Using Presence Detection
Automatic Light Switch Using Presence Detection
Introduction to and installing Fritzing
Billing of materials
How to emulate reading analog values on digital pins
Starting our project and installing the necessary libraries
The Pi4J libraries
Adding the HD44780-compatible 16x2 character display
Showing data on the HD44780-compatible display
Adding the light-dependent resistor to the setup
Reading and displaying the values from the LDR
Using digital out to switch and display a relay status
Automatic switch based on environment lighting
Using the Bluetooth chip on the Raspberry Pi
Bluetooth device discovery
Putting it all together, our first automation project
Summary
3
A Social and Personal Digital Photo Frame
A Social and Personal Digital Photo Frame
Bill of materials
Waveshare HDMI display
Summary
4
Integrating a Real-Time IoT Dashboard
Integrating a Real-Time IoT Dashboard
Adafruit IO
Summary
5
Wireless Controlled Robot
Wireless Controlled Robot
Prerequisites
The Zumo chassis kit
Writing your Java program
Running and testing your Java program
Summary
6
Building a Multipurpose IoT Controller
Building a Multipurpose IoT Controller
Prerequisites
Preparing your Raspberry Pi board
Writing your first Java web application
Summary
7
Security Camera with Face Recognition
Security Camera with Face Recognition
Raspberry Pi camera module
OpenCV
Working with video
Summary

Running and testing your Java program

First, insert four rechargeable NiMH AA batteries into the battery compartment of the Zumo chassis. Then take the USB battery pack, shown in Figure 5-22, to power your Raspberry Pi:

Figure 5-22: USB battery pack for Raspberry Pi - 10000mAh - 2 x 5V outputs

The ROMOSS USB battery pack has two USB A ports for regulated 5V output. The port placed on top can provide 1 A and the bottom one can provide 2 A. Make sure to use the 2 A USB port marked with double flash icons to power the Raspberry Pi (Figure 5-23). Now connect the USB battery pack to the Raspberry Pi using the micro USB cable:

Figure 5-23: 2A output marked with double flash icons
  1. Using the NetBeans IDE, build the Java project ZumoRobot by clicking Run|Bulid Project (ZumoRobot) in the menu bar or pressing F11 on your keyboard. Fix any errors you encountered during the build process. After successfully building the...
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