ArduinoCore-Zephyr 1.0 Adds VENTUNO Q and 11 Boards

Arduino's Zephyr Core Finally Drops the Beta Label

ArduinoCore-Zephyr reached 1.0.0 on September 4, 2026, and the version number is the news. This is the software layer that lets you write an ordinary Arduino sketch and have it run on top of the Zephyr real-time operating system instead of Arm Mbed, and until this release it carried a beta label in the package index. That label is now gone.

• Zephyr base: updated to 4.4.1, pulling in upstream driver support, security fixes and general improvements
• New board: the Arduino VENTUNO Q, specifically its STM32H5F5 real-time microcontroller
• New capability: Nicla Vision can capture and process camera image data directly through the Zephyr core
• Board coverage: eleven boards in total, spanning UNO Q, VENTUNO Q, Portenta, Nano, Nicla and Opta families

Which Arduino Boards Does Zephyr 1.0 Support?

The supported list now covers UNO Q, VENTUNO Q, Portenta H7, Portenta C33, Opta microPLC, GIGA R1 WiFi, Nano Matter, Nano RP2040 Connect, Nano 33 BLE, Nicla Sense ME and Nicla Vision.

That spread matters more than the count. It reaches from a hobby-tier Nano through an industrial DIN-rail PLC, which means a maker prototyping on a Nano 33 BLE and an integrator deploying an Opta in a control cabinet are now building on the same RTOS underneath the same sketch API. Arduino has been moving off Mbed since Arm wound the project down, and 1.0.0 is the point where the replacement stops being an experiment.

The VENTUNO Q addition closes a gap on Arduino's own flagship. We covered the board when Arduino turned 21 with the dual-brain Ventuno Q in March — a Qualcomm applications processor paired with an STM32 handling real-time motor control. The Zephyr core now targets that STM32H5F5 side directly, so the deterministic half of the board is programmable from the standard Arduino toolchain.

What Nicla Vision Camera Support Unlocks

Capturing frames through the Zephyr core rather than a board-specific shim is the kind of change that reads as plumbing and behaves as a feature. It means image capture on Nicla Vision now sits behind the same RTOS abstractions as everything else on the board — threads, drivers and timing all managed by Zephyr rather than by a special case.

For anyone building a small vision node, that translates into being able to run capture alongside networking and sensor tasks with real scheduling guarantees, instead of hoping a superloop keeps up. It is the same argument for an RTOS that applies anywhere timing and concurrency collide, and it is why the open-source DECT NR+ stack we covered in August chose Zephyr as its target too.

How to Install ArduinoCore-Zephyr 1.0.0

The process is deliberately unremarkable. Update the Arduino IDE, install or update the Arduino Zephyr Boards package to version 1.0.0, then build sketches normally. On the first upload the IDE installs the Zephyr bootloader itself, so there is no manual flashing step to get wrong.

Under that simple surface, the release absorbed more than forty merged pull requests. The changelog covers serial communication improvements and USB CDC fixes, runtime I2C timing evaluation on the STM32H7, additional exported system functions including getentropy and gmtime, a better analogReference implementation, and WiFi library firmware version support. None of those are headline features. All of them are the sort of thing that decides whether a project ships or stalls at 2am.

Why an RTOS Under Arduino Is the Right Move

The Arduino API's great virtue is that it hides the machine. Its historical cost is that it hides the machine so completely that anything needing real concurrency, deterministic timing or a proper driver model means abandoning the environment entirely.

Putting Zephyr underneath keeps the friendly surface and puts an industry-standard, actively maintained RTOS beneath it — one with a large driver ecosystem, a serious security posture and long-term support behind it. A project can start as a sketch and grow into a threaded application on the same board without a rewrite, and a student who learns the Arduino API on a Nano is now learning on top of a kernel used in shipping industrial products.

More microcontroller and single board computer news in our mini computer coverage.

Sources: CNX Software — September 4, 2026; Arduino — ArduinoCore-zephyr 1.0.0 release — accessed September 4, 2026.