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


In this chapter, we have interfaced with a 16x2 character display directly connected to the Raspberry Pi and covered the code used to change the content. We have covered how we are able to read analog data with digital pins by implementing an RC circuit. By attaching a relay with a transistor we have seen how we can switch a 5 V device with a 3 V signal pin that in turn is able to turn on a high-power device. And last but not least, we have taken the first steps with the Raspberry Pi integrated Bluetooth chip to detect nearby Bluetooth devices. This has all led us to our very first home automation project, allowing us to detect presence based on ambient lighting to switch a relay.

As you may have noticed, we looked quite deeply into each step of the code. This is meant as the introduction into the foundations of the Pi4J libraries and how these are used. We have not covered every part yet, only the basics...