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A Radar Scope on the Arduino UNO Q: Multi-Target Tracking with the Ai-Thinker RD-03D mmWave Sensor Arduino

A Radar Scope on the Arduino UNO Q: Multi-Target Tracking with the Ai-Thinker RD-03D mmWave Sensor

UNO Q with a 24 GHz radar wired to the board to build a live radar scope - the MCU turns a binary sensor stream into three tracked targets, and the Linux side draws them sweeping across a web dashboard. Along the way, a proper look at how FMCW radar works, all showing the strength of mmWave radar.

Derek Molloy Derek Molloy · Aug 10, 2026 · 73 min read
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
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
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