Introducing the Arduino Nano R4: small in size, big on possibilities

We’re excited to welcome a new member to the Arduino Nano family – the Nano R4. Powered by the same RA4M1 microcontroller that’s at the core of the popular UNO R4 boards, this tiny-yet-mighty module is here to help you take your projects from prototype to product, smoothly and efficiently. If you’re already prototyping with UNO R4, Nano R4 is your perfect ally to move on to production with minimal adjustments!

So many features, in such a small package

Whether you’re working on a connected device, a smart home application, or a space-constrained automation solution, the Nano R4 is designed to fit right in. It brings you a compact form factor, castellated pins, and single-sided components for streamlined soldering onto custom boards, keeping the profile slim and ready for production.

Plus, there’s a built-in 3.3-V I2C Qwiic connector and an extra 5V I2C port, so you can quickly hook up sensors, peripherals, and even our new Modulino nodes to unlock even more possibilities. For more complex builds, consider pairing Nano R4 with the new Nano Connector Carrier to add all the sensors, actuators, and expansion modules you need! 

And did we mention the VRTC pin to keep the RTC running with a small battery, and programmable RGB LED for intuitive feedback, debugging, and user interaction? 

All in all, the Nano R4 is your fast lane to deploying smarter systems. Its compatibility with Arduino’s tools, libraries and the broader RA4M1-based ecosystem means you can reuse code, simplify your workflow, and spend less time debugging and more time building.

With or without headers: the choice is yours

The Nano R4 is available in two variants – with or without headers – so you can choose the one that best fits your needs and experience level.

• The Nano R4 with headers is ideal for students, educators, and designers eager to explore embedded development in a more hands-on way. It’s breadboard-friendly, plug-and-play, and fully compatible with many familiar Arduino tools and libraries – including those for the popular UNO R4 Minima. This makes it a natural next step for anyone looking to go beyond entry-level, and start building real-world connected solutions.

• The Nano R4 without headers is a production-ready module for more advanced users, because it’s perfect for integrating directly into custom PCBs. Developers and designers working on compact or commercial devices can prototype quickly and scale seamlessly – all while leveraging Arduino’s ecosystem.

The Nano R4 is part of our commitment to growing an open, accessible ecosystem that evolves with you. From individual boards to scalable systems, we’re here to support your ideas. So, go get your new Nano today, and don’t forget to share your small-size, big-ambition projects with the community!