Raspberry Pi on webtechie.be

My Book 'Java Programming for Raspberry Pi' is Now Available as Softcover and Hardcover on Amazon

Fri, 10 Jul 2026 00:00:00 +0000

“Java Programming for Raspberry Pi: A Hands-On Guide to Electronics and IoT Projects” is now available as a softcover and hardcover paper book through Amazon, on top of the Kindle ebook and the pay-as-you-wish version on Leanpub . If you prefer holding a physical book while you’re wiring up LEDs and sensors on your Raspberry Pi, that’s now possible again.

From breadboard chaos to a real PCB: designing the Pi4J smoke test board

Thu, 25 Jun 2026 00:00:00 +0000

Testing a Java I/O library properly means testing it on real hardware. No mocks, no stubs, just actual pins doing actual things. For Pi4J, that means running the smoke test: a setup with two BMP/BME280 sensors, some GPIO-to-GPIO jumper connections, and a bunch of patience while you untangle the wires for the third time this week.

JCast: Van Commodore 64 tot Java Champion: code begrijpelijk maken

Mon, 04 May 2026 00:00:00 +0000

Code only helps people when they can read it, run it, and understand what it does. That same idea applies to documentation, to teaching kids how to program, and to the way developers talk about their work. On JCast, hosts Viktor Van Steenweghen, Oumaima Zerouali, and Maarten Casteels sit down with guest Frank Delporte for a Dutch-language conversation about Java, writing, and the people behind the keyboard.

Links from the JCON talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

Wed, 22 Apr 2026 00:00:00 +0000

These are the links from the JCON talk in Cologne, Germany, on April 22, 2026: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry Pi ”.

I Benchmarked Java on Single-Board Computers: Orange Pi 5 Ultra and Raspberry Pi 5 Lead the Pack

Tue, 24 Feb 2026 00:00:00 +0000

In my “Java on Single Board Computers” series, I already published several posts and videos in which I unpack the board, connect it for the first time, and try to install and run some simple Java code. In this post, I want to share some benchmarks of Java on these boards to get a better idea of the performance we can expect from Java on these platforms.

Links from the jChampions Conference talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

Tue, 27 Jan 2026 00:00:00 +0000

These are the links from the jChampions Conference online talk, on January 27, 2026: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry Pi ”.

Keeping Single-Board Computers Organized with a 3D Printed Stack

Wed, 14 Jan 2026 00:00:00 +0000

As I shared in previous posts, I want to learn and experiment more with different types of single-board computers in 2026. But I also want to keep them organized and easily accessible. Following the Clean Desk Policy (CDP) in my little home-office also keeps my mind clean :-)

The FFM API: How OpenJDK Changed the Game for Native Interactions (And Made Pi4J Better!)

Mon, 05 Jan 2026 00:00:00 +0000

This is a crosspost from the article I contributed to this year’s JVM Advent .

The Pi4J project is a Java library that allows you to control the GPIO pins and electronic components connected to a Raspberry Pi with pure Java code. It removes the complexity of using native libraries and the Java Native Interface (JNI) , allowing you to focus on your application logic.

Foojay Podcast #85: Code, Community, and Opportunity: Making Tech Accessible for Everyone

Mon, 08 Dec 2025 00:00:00 +0000

Talent shows up everywhere, but the chance to use it does not. Kids in underserved schools, students without a laptop, and developers outside the usual hubs all hit walls the rest of us never see. In this episode we talk with Daniel De Luca, Kenny Schwegler, Cassandra Chin, and Igor De Souza about the work they do to lower those walls, in Foojay Podcast #85.

Links from the YavaConf talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

Wed, 03 Dec 2025 00:00:00 +0000

These are the links from the Ya!vaConf virtual talk on December 4, 2025: “Java Champion Talk - How the new Foreign Function & Memory API pushes Java on Raspberry Pi to the next level ”.

Links from the JFall talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

Thu, 06 Nov 2025 00:00:00 +0000

These are the links from the JFall talk in Ede, The Netherlands, on November 6, 2025: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry Pi ”.

Java 21+ on Raspberry Pi Zero 2 is Back In Business

Mon, 13 Oct 2025 00:00:00 +0000

As described before on Java 21+ Not Working on Raspberry Pi Zero 2 , a problem appeared to execute Java code on the Raspberry Pi Zero 2 with OpenJDK 21 or higher. Reason: in OpenJDK 21 the Just-In-Time (JIT) compiler has been improved, but this change doesn’t work correctly on the ARM Cortex-A53 processor as used in the Zero 2. It’s another type of processor compared to, for instance, the Raspberry Pi 4 (Cortex-A72) and 5 (Cortex-A76).

Links from the Devoxx talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'

Wed, 08 Oct 2025 00:00:00 +0000

These are the links from the Devoxx talk in Antwerp, Belgium, on October 9, 2025: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry Pi ”.

2025 Update of my ebook 'Getting Started with Java on the Raspberry Pi'

Thu, 02 Oct 2025 00:00:00 +0000

2025 is an important year as Java 25 got released, a version which will be supported for many more years. On top of that, the Pi4J library will soon be published as V4.0.0 with a new plugin making use of the FFM API, a new feature added to Java in version 22.

10xInsights: Frankly Speaking: How Java, Raspberry Pi, and Drum Created a Guru

Tue, 15 Jul 2025 00:00:00 +0000

A long career in tech rarely follows a straight line. Frank’s path runs from a Commodore 64 to Java Champion, with detours through drums, documentation, and a stack of Raspberry Pi boards. Hosts Kadi McKean and Steve Poole invited Frank as the guest on episode 6 of 10xInsights to unpack that journey.

Java 21+ Not Working on Raspberry Pi Zero 2

Wed, 25 Jun 2025 00:00:00 +0000

Originally posted on the Pi4J website .

Dieter Holz was experimenting with Pi4J V3 on a Raspberry Pi Zero 2. Because this version requires Java 21 or newer, he upgraded his OS to a newer Java version and found out that no Java code could be executed. He tried with Java 21 and 24, and neither worked correctly, although Java 17 runs without problems.

Foojay Podcast #66: Let's Talk About Java Code! Diving into a few Foojay blog posts…

Tue, 11 Feb 2025 00:00:00 +0000

Reading a good blog post often raises more questions than it answers. So we picked a handful of recent Foojay articles and asked the authors to walk us through their thinking, their code, and the trade-offs behind it. In this episode we sit down with Wim De Troyer, Maximillian Arruda, Rijo Sam, and Igor Kulakov for Foojay Podcast #66.

Controlling a Raspberry Pi HDMI Camera with a Java API

Wed, 08 Jan 2025 00:00:00 +0000

In this post you’ll learn how you can run a Java application on a Raspberry Pi Zero 1 to turn it in a controllable HDMI camera. I use such cameras in my setup with an ATEM Mini Pro HDMI video switcher . This allows me to have four different inputs for a very affordable price to create videos, tutorials, virtual conference talks, etc. As I wanted to be able to easily change the zoom level of these Raspberry Pi cameras, I created a small Java application with an API.

FLOSS Weekly Episode 809: Pi4J – Stable And Boring On The Raspberry Pi

Wed, 13 Nov 2024 00:00:00 +0000

Java on a Raspberry Pi sounds like an odd pairing to some developers, but it opens the door to a huge ecosystem for anyone who already knows the language. Pi4J wraps the low-level pins and buses behind a clean Java API, so reading a sensor or driving an LED stays familiar. Jonathan Bennett and David Ruggles invited Frank Delporte on FLOSS Weekly Episode 809 to dig into how the project got here and why “stable and boring” is a compliment.

Java Challengers: Java Rockstar Career #4 - Java on Raspberry Pi, Start with Open Source with Java with Frank Delporte

Fri, 01 Nov 2024 00:00:00 +0000

Wondering how a Java developer moves from writing business code to tinkering with hardware and contributing to open source? That path is shorter than most people think, and it starts with curiosity and a small board on your desk. Rafael del Nero sits down with Frank Delporte for episode #4 of the Java Rockstar Career series to walk through that journey.