Topic

Zephyr

The Zephyr Devicetree: An Interactive Demo Zephyr

The Zephyr Devicetree: An Interactive Demo

A gentle, but complete introduction to the Zephyr devicetree, taught through the one thing every beginner gets wrong - which way round an LED is wired. Built from nothing on a low-cost Seeed XIAO nRF52840, with three onboard LEDs, one external LED wired deliberately backwards, and a button.

Derek Molloy Derek Molloy · Aug 07, 2026 · 69 min read
Under the Hood of the Arduino UNO Q: Vanilla Zephyr on the Cortex-M33 Arduino

Under the Hood of the Arduino UNO Q: Vanilla Zephyr on the Cortex-M33

Part three of the UNO Q series removes the App Lab, Arduino core, sketch loader and just uses west, a devicetree, and our own Zephyr firmware on the board's STM32U585, driving the 13x8 LED matrix through Zephyr's display API with grayscale functionality.

Derek Molloy Derek Molloy · Jul 30, 2026 · 50 min read
How Charlieplexing works: an interactive demo Embedded

How Charlieplexing works: an interactive demo

Eleven pins, 104 LEDs, and a scan you can slow down until the trick falls apart. An interactive walkthrough of the Arduino UNO Q's charlieplexed matrix, built from the board's own devicetree.

Derek Molloy Derek Molloy · Jul 29, 2026 · 28 min read
A Real Dual-Brain Application on the Arduino UNO Q: an AI Brick, a Camera, and a Presence Lamp Arduino

A Real Dual-Brain Application on the Arduino UNO Q: an AI Brick, a Camera, and a Presence Lamp

Part two of the UNO Q series puts the board's dual-brain design to real work - a vision AI Brick on the Linux side detects a person through a camera, and the microcontroller side turns that into a smoothly breathing lamp that never stutters, no matter how hard the AI is working.

Derek Molloy Derek Molloy · Jul 22, 2026 · 19 min read
Getting to Know the Arduino UNO Q: Two Brains, One Board, and Zephyr Underneath Arduino

Getting to Know the Arduino UNO Q: Two Brains, One Board, and Zephyr Underneath

The Arduino UNO Q pairs a quad-core Linux processor with a real-time STM32 microcontroller on one UNO-shaped board, and quietly runs Zephyr where the classic Arduino runtime used to be. This guide takes an engineer's look at the architecture.

Derek Molloy Derek Molloy · Jul 21, 2026 · 30 min read
The Zephyr Web Server, Now in C++: Classes for Embedded Hardware Zephyr

The Zephyr Web Server, Now in C++: Classes for Embedded Hardware

A short follow-on from the Zephyr Thread web server guide, rebuilding the same project in C++ on the Seeed XIAO nRF52840, and adding the RGB LED and the on-die temperature sensor to show why classes suit Zephyr hardware so well.

Derek Molloy Derek Molloy · Jul 06, 2026 · 22 min read
A Zephyr Web Server on the Seeed XIAO nRF52840, over Thread (C/C++) Zephyr

A Zephyr Web Server on the Seeed XIAO nRF52840, over Thread (C/C++)

In an earlier guide we built a tiny web server on an ESP32-C3 in async Rust, using Embassy. A browser could connect over Wi-Fi,

Derek Molloy Derek Molloy · Jul 03, 2026 · 34 min read