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

4 star

3 star

2 star

1 star

Building a Multipurpose IoT Controller

Raspberry Pi is great for building powerful server-based applications, configuring it to act as a web server by installing a web server such as Nginx, Apache, Jetty, or lighttpd. A web server can serve a web application to many users concurrently through a network. But unlike other traditional web applications, Raspberry Pi-hosted web applications can be used to interact with the Raspberry Pi itself, and other peripherals attached to it.

The following diagram shows a Raspberry Pi board configured as a web server with two clients connected to it through a router:

Figure 6-1: Simple Raspberry Pi client-server model

A lightweight web application can be used to interact with sensors and actuators attached to the Raspberry Pi. As an example, you could control an LED attached to a GPIO pin or display readings of a sensor attached to the I2C pins of the Raspberry Pi.

In this chapter...