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Arduino Uno R4 WiFi¶


The Arduino UNO R4 WiFi represents the pinnacle of IoT and wireless innovation. Equipped with the power of the RA4M1 microcontroller by Renesas and further enhanced by an ESP32-S3 coprocessor, this board is meticulously crafted to meet the evolving demands of modern-day makers. Whether you’re a newcomer to the Arduino world or a seasoned tech enthusiast, the UNO R4 WiFi ensures top-notch performance, all while maintaining the trusted form factor and 5 V operating voltage.

Venturing further into the Arduino domain, the UNO R4 WiFi emerges as a symbol of connectivity, efficiency, and ingenuity.


Here’s what the Arduino UNO R4 WiFi offers:

  • Seamless Integration with UNO Ecosystem: Staying true to its heritage, the UNO R4 WiFi guarantees compatibility with the iconic UNO form factor, pinout, and 5 V operating voltage. Transitioning from previous versions is effortless, thanks to the harmonious design and the expansive Arduino UNO ecosystem.

  • Supercharged Memory and Processing: Step into a realm of faster computations and intricate projects. The UNO R4 WiFi not only boasts enhanced memory but also operates with a clock speed that’s three times quicker, ensuring your projects run smoothly and efficiently.

  • Diverse On-Board Peripherals: From a 12-bit DAC and CAN BUS to an OP AMP and a unique SWD port, the UNO R4 WiFi is equipped with features that elevate your project capabilities. Dive into a realm of endless possibilities and unleash your creativity.

  • Connectivity at its Best: With integrated Wi-Fi® and Bluetooth® Low Energy, the UNO R4 WiFi paves the way to the Internet of Things. Whether crafting a smart home system or an interactive dashboard, this board has your back.

  • Interactive 12Ă—8 LED Matrix: Illuminate your projects with dynamic animations or real-time sensor data visualization, all without the need for external hardware.

  • Advanced Safety Mechanisms: The board’s innate ability to detect and prevent potentially harmful operations, such as division by zero, ensures a seamless experience. Plus, with detailed feedback on the serial monitor, you’re always in the loop.

  • Qwiic Connector for Rapid Prototyping: Broaden your project scope with the Qwiic connector. With a vast range of I2C-compatible modules available, prototyping becomes a breeze.

Step into the future of making with the Arduino UNO R4 WiFi. Whether you’re aiming to integrate wireless functionalities, explore the vast IoT landscape, or simply upgrade your existing setup, this board is the ideal partner for your upcoming ventures.

Tech specs



Arduino® UNO R4 WiFi


Renesas RA4M1 (Arm® Cortex®-M4)



Programming Port


Digital I/O Pins



Analog input pins




PWM pins




Yes, 1x


Yes, 1x


Yes, 1x


Yes 1 CAN Bus


Circuit operating voltage

5 V (ESP32-S3 is 3.3 V)

Input voltage (VIN)

6-24 V

DC Current per I/O Pin

8 mA

Clock speed

Main core

48 MHz


up to 240 MHz



256 kB Flash, 32 kB RAM


384 kB ROM, 512 kB SRAM



68.85 mm


53.34 mm