These are all the links of my presentation at BeJUG in Waregem, Monday, July 24, 2024. Lessons Learned from JavaOnRaspberryPi, the Potential of Bits and Bytes, Cost and Eco-Efficiency I started experimenting with Java on the Raspberry Pi a few years ago because I wanted to learn if I could control electronic components with my favorite programming language.
These are all the links of my presentation at the JChampions Conference, Monday January 29, 2024, 16:00 CET. What I Learned About OpenJDK As a Docs Writer As a teenager, a Commodore 64 and DIY solder kits ignited my passion for computers and electronics. But for some obscure reason, I chose an unexpected path by attending film school.
One of the most “fancy” electronic components is definitely a LED strip. It’s really cool to control a long strip of lights with only a few lines of code… But, there is a problem. The timing of the signals is crucial to reliably control these strips. Both Python and Java on a Raspberry Pi can struggle with these timings as they are running on Linux, a non-real-time operating system.
These are all the links of my presentation at Devoxx Belgium, Wednesday 12:00-12:50, Room 7. Unlocking the Potential of Bits and Bytes: Reducing Data Footprint for Cost and Eco-Efficiency In the age of unlimited storage space, we forget to consider the financial and ecological costs. Transmitting and storing data in XML, JSON, or (if you want to hurt people) YAML makes data human-readable, which is great for debugging and testing but is a very inefficient, heavy, and expensive way of handling data.
Yes, the Raspberry Pi Operating System is awesome! But the Pi4J project made it if even more awesome by adding “goodies” for Java developers! Pi4J OS is not yet another OS, but the official Raspberry Pi OS, with additional tools and preconfigurations to make it the ideal OS for any Java and JavaFX developer who wants to use a Raspberry Pi.
To make it as easy as possible to get started with Java on the Raspberry Pi to interact with electronic components, I started a new section on the Pi4J website with JBang examples. In this tutorial, I want to show you how you can read the temperature, humidity, and pressure from a BME280 Sensor.
Writing has always been my passion, and even in my previous jobs as a developer, I stood out as the one who enjoyed creating and maintaining documentation. But June 9th, 2023, marked my first birthday as a full-time technical writer at Azul. Yes, it’s already a year ago that I changed from being a developer-who-also-writes to a writer-who-also-develops.
After my talk at J-Fall I got the question what is required to get started with #JavaOnRaspberryPi. In my book I list the components that are used, but indeed a short overview was missing (it’s now added to the ebook…). So here we go: Raspberry Pi While working on the book, I used a Raspberry Pi 3.
Links used in my talks at Devoxx 2022 (Antwerp, Belgium) and J-Fall (Ede, The Netherlands). Book “Getting Started with Java on the Raspberry Pi Twitter Frank #JavaOnRaspberryPi Work Televic Rail Eeve Azul foojay.io Website - Friends of OpenJDK Controlling Electronics with JBang on the Raspberry Pi All Raspberry Pi articles (over 50!
As I’m becoming a senior developer in terms of age, I’ve transitioned from one language to another. One of my main interests has always been clean, easy-to-understand UIs (User Interface). That journey started for me with Director (to create multimedia CD-ROMs), Flash website animation, and Flex Rich Internet Applications (= “Flash on steroids”).
As part of the Pi4J project, we created an example game with JavaFX and FXGL that uses an Arcade kit with a Joystick and big push buttons. The test setup for this project was kicking around my desk, so that was the perfect victim for my next 3D printing project…
A few years ago I did my first experiments with an MQTT server (Mosquitto) running on a Raspberry Pi to connect an Arduino and Raspberry Pi for the drumbooth of my son. The full process is described in my book “Getting Started with Java on the Raspberry Pi”. In this series of posts we are going to take a different approach with an online MQTT-compatible service: HiveMQ Cloud.
Are you a serious Java-developer looking for a fun project? Or want to learn something completely new and use your Java-knowledge to control electronic components? Here we go with this small project to get you introduced to the world of electronics programming! This post was originally posted on Java Advent 2020,
Today I could give my talk “Having fun with Java and JavaFX on the Raspberry Pi” at the JFXDays. Normally this event takes place in Zurich, but this year also went virtual because… well because of 2020… I’m honored that my talk was part of this two-day event with a lot of talks by all the people who are the driving forces in the JavaFX community!
Today I had my first Devoxx talk, after my Java virtual talk a few weeks ago at the “Oracle Groundbreakers APAC Virtual Tour 2020” conference (21/10)! The event in Ukraine also went virtual which gave me the opportunity to share my love for Java, JavaFX and the Raspberry Pi again.
Today I had the honor to speak at the “Oracle Groundbreakers APAC Virtual Tour 2020” conference. And of course the title of my talk was “Java and JavaFX on the Raspberry Pi”. Video (start at 3'05") Links mentioned during the talk (in order) Passendale, Belgium Televic Rail - Passenger Information Systems CoderDojo Book: “Getting Started with Java on the Raspberry Pi” Raspberry Pi Announcing Raspberry Pi Compute Module 4 Raspberry Pi Compute Module 4 on sale now from $25 TIOBE Index Which Programming Languages Use the Least Electricity?
A topic which comes up from time to time in questions related to Java and the Raspberry Pi, is the support of the 4th version of this board in combination with Pi4J, “the friendly object-oriented I/O API and implementation library for Java programmers to access the full I/O capabilities of the Raspberry Pi “.
In my book “Getting Started with Java on Raspberry Pi” I dedicated a chapter on Pi4J, the leading framework to combine the power of Java with the hardware capabilities of the Raspberry Pi. This project which was started in 2012 by Robert Savage, evolved during the years to be able to support all the different Raspberry Pi-versions and many types of hardware components.
In “The MagPi Magazine” #93 and #94, published by the Raspberry Pi Foundation, you can find two articles which describe how you can get started with Java, Maven, Visual Studio Code and Pi4J on the Raspberry Pi. To make everything even more clear, I created a step-by-step video on Vimeo which shows everything which is described in those two articles.
While looking for a cheap and nice component to demonstrate the use of SPI (Serial Peripheral Interface) I found out this 8x8 matrix LED display on a board with a MAX7219 chip is the perfect piece of hardware! What you see in the video is the end result with: All on/off Demo of all the lines Demo of all the columns 5 random generated matrixes A set of images including an attempt of the Raspberry Pi logo A, B, E, S, T fixed The same characters scrolling one-by-one Wiring As we are using SPI, the number of connections to be made is very minimal:
Pi4J contains helper methods to minimize the work needed to use certain hardware modules on the Pi with Java. As an example, we will be using “GpioLcdDisplay” to control an LCD with 2 rows of 16 characters. After requesting the weather forecast from a public website, we will visualize this on the LCD display.
Trisha Gee (Coder, blogger, speaker, Developer Advocate at JetBrains, @trisha_gee), which I interviewed for “Chapter 4: Choosing an IDE”, and Josh Long (Spring Developer Advocate at Pivotal, @starbuxman) worked together on a blog series in which they showed the power of reactive data produced by a Spring application. Instead of repeating a REST call each time you want to get data from the server, you do one call which returns a continuous stream in which new data is pushed based on an interval.
What is Pi4J See https://www.pi4j.com/1.2/index.html This project is intended to provide a friendly object-oriented I/O API and implementation libraries for Java Programmers to access the full I/O capabilities of the Raspberry Pi platform. This project abstracts the low-level native integration and interrupt monitoring to enable Java programmers to focus on implementing their application business logic.
As I was learning Spring Boot myself, I thought the easiest way to learn was trying to build an example and write about it. So here we go… :-) What is Pi4J? While doing my experiments earlier with Java 11 on a Raspberry Pi, I came accross the Pi4J project which allows you to control the GPIO pins easily from Java.
While trying out what Pi4J can do, I found it could easily be extended with a JavaFX application to provide info about the headers on a Pi board. This could later be extended to a remote/local (touch) User Interface using the REST interface from this post. Starting point I started with the minimal JavaFX application I created before for a quick start with the correct pom.
As my daily work mainly is Java and back-end stuff on “real servers”, I set myself for 2019 as a personal goal to experiment with Java 11 on a Raspberry PI. While doing so, I needed multiple scripts and test projects. And because I strongly believe in “learning by sharing”, this resulted in a blog series with links to the sites and people who inspired and helped me, plus the sources on my GitHub account.
What we will do Based on the previous blog posts we can install and run Java 11 we have a minimal JavaFX 11 application which runs fine on a PI So there is one “small” step remaining: build something which actually does something on the PI, talking to the GPIO’s and show what’s happening.
For sale as ebook on Leanpub, with continuous free updates! Introduction When I first managed to blink a LED connected to a Raspberry Pi with Java, I was super excited! Controlling physical things with some lines of code is magic! This book includes a lot of info and history about Java itself and how to install it on the Raspberry Pi.