Arduino UNO R4: What's New in the Latest Iteration?

 The Arduino UNO has been a popular and reliable microcontroller board for makers, hobbyists, and professionals alike. With each iteration, the Arduino team consistently strives to improve upon its predecessors by addressing user feedback, integrating new technologies, and enhancing overall performance. In this blog post, we'll dive into the exciting new features and improvements that the Arduino UNO R4 brings to the table.

Arduino® UNO R4 WiFi


  1. Upgraded Microcontroller

The Arduino UNO R4 comes equipped with a more powerful microcontroller, offering increased processing speed and capabilities. While the previous versions featured the ATmega328P, the R4 version now uses RA4M1 32 bits microprocessor from Renesas with the ESP32-S3 from Espressif. This upgrade allows for more complex projects, faster execution of code, and a smoother user experience overall.

  1. Increased Flash Memory

One of the significant limitations of previous Arduino UNO boards was their relatively limited Flash memory. With the UNO R4, this constraint has been addressed. The Renesas (R7FA4M1AB3CFM#AA0) microcontroller now provides 256KB of Flash memory, nearly doubling the storage capacity from the earlier models. This allows developers to write larger and more sophisticated code without the worry of running out of memory space.

  1. Expanded RAM

The Arduino UNO R4 also sees a welcome upgrade in terms of RAM (Random Access Memory). With 32KB of SRAM, developers can now create applications that require more data storage during runtime. This additional memory facilitates the handling of larger data sets, making the board more suitable for advanced data manipulation projects.

  1. USB Type-C Port

In response to the growing popularity of USB Type-C connectors, the Arduino UNO R4 now features a USB Type-C port. This modern and reversible connector provides faster data transfer rates and more robust connectivity. It simplifies the process of connecting the board to a computer or other devices, ensuring a more reliable and user-friendly experience.

  1. Improved Power Management

The new power management system in the Arduino UNO R4 enhances energy efficiency, making the board more eco-friendly and extending battery life for portable projects. The microcontroller can now switch between power sources seamlessly, optimizing power consumption without sacrificing performance.

  1. Built-in Wireless Connectivity

One of the most exciting additions to the Arduino UNO R4 is the integration of built-in wireless connectivity. Unlike its predecessors, which required additional shields or modules for wireless communication, the R4 comes with Wi-Fi and Bluetooth capabilities out of the box. This opens up a world of possibilities for IoT (Internet of Things) projects and enables easier communication with other devices.

  1. Enhanced GPIO Pins

The R4 version features more GPIO (General Purpose Input/Output) pins than its predecessors, providing developers with greater flexibility when connecting sensors, actuators, and other external components. With 26 GPIO pins, including 12 PWM-capable pins, the UNO R4 allows for more complex and intricate electronic projects.


The Arduino UNO R4 represents a significant step forward in the evolution of the beloved microcontroller board. With its upgraded microcontroller, increased memory, modern USB Type-C port, improved power management, and built-in wireless connectivity, the R4 version empowers makers to bring their ideas to life with even more efficiency and creativity.

Whether you are a seasoned Arduino enthusiast or a newcomer to the world of electronics, the UNO R4 is a compelling choice for your next project. Its enhanced capabilities and user-friendly design ensure that it remains a reliable and popular platform for innovation and learning in the years to come. So, why wait? Get your hands on the Arduino UNO R4 and unleash your creativity today! Happy tinkering!

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