The Arduino UNO R4 WiFi combines the processing power of Renesas’ RA4M1 microcontroller with the wireless connectivity of Espressif’s ESP32-S3. It also includes a built-in 12×8 LED matrix, Qwiic connector, VRTC, and OFF pin, providing a versatile platform for a wide variety of projects.

Whether you're adding wireless connectivity to an existing setup or starting your first project, the UNO R4 WiFi gives you the tools to expand your ideas and build with confidence.

Key Benefits

• Hardware compatibility with the UNO form factor: The UNO R4 WiFi retains the familiar form factor, pin layout, and 5V operating voltage of the UNO R3, enabling seamless compatibility with existing shields and projects.
• Expanded memory and faster clock: With increased memory capacity and a higher clock speed, the UNO R4 WiFi can execute more precise computations and manage more demanding applications efficiently.
• Expanded on-board peripherals: The UNO R4 WiFi includes several integrated peripherals such as a 12-bit DAC, CAN bus support, and an operational amplifier (OP AMP), enabling more advanced functionality and increased design flexibility.
• Extended 24V tolerance: The UNO R4 WiFi accepts a wider input voltage range, enabling direct integration with motors, LED strips, and other actuators while using a single shared power source.
• HID support: With built-in HID functionality, the UNO R4 WiFi can act as a mouse or keyboard when connected to a computer via USB, enabling it to send keystrokes and mouse actions directly.
• Wi-Fi® and Bluetooth®: Equipped with an ESP32-S3 module, the UNO R4 WiFi enables seamless wireless connectivity for your projects. When paired with the Arduino IoT Cloud, it allows makers to remotely monitor, manage, and control their devices.
• The Arduino UNO R4 WiFi includes a Qwiic I²C connector, making it easy to connect modules from the extensive Qwiic ecosystem. With the help of adapter cables, it can also interface with sensors and actuators that use other connector standards.
• Battery-powered RTC support: The UNO R4 WiFi provides extra pins, including an OFF pin for powering down the board and a VRTC pin that maintains power to the internal Real-Time Clock so it continues running.
• LED matrix: The UNO R4 WiFi includes a bright 12×8 red LED matrix, making it easy to create animations or visualize sensor data directly on the board without needing extra components.
• Runtime error diagnostics: The UNO R4 WiFi includes a built-in mechanism that detects runtime crashes and reports helpful diagnostic information, including guidance on the line of code responsible for the error.