Raspberry Pi 3 Projects for Java Programmers

By : Chandra, John Sirach, Seneviratne

Buy this Book

Raspberry Pi 3 Projects for Java Programmers

By: Chandra, John Sirach, Seneviratne

Buy this Book

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.

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

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

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

A Social and Personal Digital Photo Frame

Bill of materials

Waveshare HDMI display

Summary

Integrating a Real-Time IoT Dashboard

Adafruit IO

Summary

Wireless Controlled Robot

Prerequisites

The Zumo chassis kit

Writing your Java program

Running and testing your Java program

Summary

Building a Multipurpose IoT Controller

Prerequisites

Preparing your Raspberry Pi board

Writing your first Java web application

Summary

Security Camera with Face Recognition

Raspberry Pi camera module

OpenCV

Working with video

Summary

Customer Reviews

5 star

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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

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...