Pi4J

Blink a LED on Raspberry Pi with Vaadin

Thanks to Vaadin, you can get a fully running application with a few clicks. And Adding GPIO-interaction is easy with the Pi4J library.

Controlling Electronics with JBang on the Raspberry Pi

JBang is a great way to create your first program to control electronic components connected to the Raspberry Pi’s GPIO pins.

Template to Get Started with Pi4J and JavaFX on Raspberry Pi

How to use the same architecture to implement a JavaFX-based GUI, a PUI attached to a Raspberry Pi, and integrate both in a clean, modular way.

Java Modules in the Pi4J Project?

Java modules have been a big discussion point before in many places. And this is now also causing some headaches in the Pi4J project…

MQTT on Raspberry Pi (Part 2): Using MQTT and Raspberry Pi to Visualize Sensor Data on a TilesFX Dashboard

In the 2nd part of the series, learn how to use MQTT and the Raspberry Pi to visualize sensor data on a TilesFX dashboard!

MQTT on Raspberry Pi (Part 1): Send Sensor Data to HiveMQ Cloud with Java and Pi4J

Publish the data of up to 100 devices to an always-on, maintenance-free message broker for free!

Pi4J V.2 Released!

The Pi4J Project was started in 2012 by Robert Savage, the same year the Raspberry Pi was introduced.

After long rework, the Pi4J library (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) has taken a big step with the first release of the V.2.

Java in Education: Combining Java with Raspberry Pi and the Pi4J Library

Although a lot of universities and high schools focus on Python and C# in their program, there are luckily a lot of others who go “full Java”.

Don’t get me wrong, I definitely don’t want to start a “programming-languages-war”, but Java is the language I used myself more than any other for the last 10 years.

Setting up a new project or building a proof-of-concept for a new idea, is a matter of hours. And there is always a solution for the problem I need to solve.

This is probably true for each developer who has enough experience in the language used the most. But having used and experimented with many other languages, I still keep returning to my “one true love”, being Java, as it always delivers the result I’m aiming for, with the right amount of code to be readable, understandable, and testable!

Interviews with Robert Savage and Johan Vos on the State of Java on Raspberry Pi

Here on Foojay.io, you can find already a long list of articles about Java on the Raspberry Pi.

As you may know, already I’m a big fan of this combination. The Raspberry Pi on one side is a very cheap computer that allows you to experiment with electronic components thanks to the Pi4J library.

And on the other hand, JavaFX is the ideal framework to build user interfaces that can directly control these components, all in one application!

But maybe you don’t have / want to believe me? So let’s ask two experts what they think is the future of #JavaOnRaspberryPi.

Vert.x Example on the Raspberry Pi with a Virtual Potentiometer

The Raspberry Pi allows us to do a lot of electronic projects without having to wait for ordered components… or even buy them at all… by using virtual components.

Today, I want to show a way to play with a potentiometer. A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.

Light Up your Christmas Tree with Java and Raspberry Pi

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!