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.
Table of Contents (8 chapters)
4
Integrating a Real-Time IoT Dashboard

The Pi4J libraries

The Pi4J library is developed by Robert Savage and is used to interact with the GPIO pins. Communication with the GPIO pins is not done by pure Java but uses a native library developed by Gordon Henderson. This library is bundled within the Pi4J library and is used automatically. The Pi4J project consists of multiple libraries which are as follows:

  • pi4j-core.jar: Always needed, and includes the pi4j native library
  • pi4j-device: Wrappers used for interactions with different kind of peripheral and different Raspberry Pi expansion boards
  • pi4j-gpio-extension.jar: Used by pi4j-device.jar or for custom extension implementations
  • Pi4j-service.jar: Provides listeners for GPIO pins

We will always include all libraries so we are sure to have all the dependencies and will make it easier for you to extend the projects without the need to search for the corresponding libraries of the same version being used...