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 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)
Integrating a Real-Time IoT Dashboard

Showing data on the HD44780-compatible display

Now that we have connected the LCD to the Raspberry Pi, it is time to actually start with the code and display some data. With the project loaded in NetBeans, open the class, which lives in the, chapter2 package. Let's take a look at the main(String args[]) method.

We see all the methods are commented out. We will be uncommenting these methods throughout the book, so each step will get more obvious, and we will be able to follow and explain all the interactions between the components and the software.

Uncomment the runLcdExample(); method and press the Run (with the green arrow) button in the IDE. NetBeans will start to compile the application; upload it to the Raspberry Pi and run it. If we have set up the wiring correctly, we will see the following screenshot, but of course, with your local time. If you are not able to see the text, we need to adjust...