The Arduino UNO R4 WiFi Development Board Original is the next-generation upgrade to the classic UNO, designed to empower IoT and embedded system projects with improved performance and connectivity. Powered by the Renesas RA4M1 Arm Cortex®-M4 48MHz processor, this board offers a 3x speed increase over the UNO R3, along with expanded memory (32kB SRAM and 256kB flash) to support complex applications. Featuring built-in WiFi, CAN bus, a 12-bit DAC, and USB-C connectivity, the UNO R4 WiFi provides modern solutions for today’s engineering challenges. With full compatibility with existing UNO shields, libraries, and tutorials, it ensures a seamless transition for Arduino enthusiasts while opening new possibilities for industrial IoT, robotics, and automotive development. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Renesas RA4M1 48MHz Processor – 3x faster performance compared to UNO R3.
Expanded Memory – 32kB SRAM and 256kB flash for complex applications.
Built-in WiFi Connectivity – Ideal for IoT projects and cloud integration.
CAN Bus Support – Enables robust communication between multiple boards.
12-bit DAC – Precise analog output for advanced audio/signal projects.
USB-C Port & 24V Power Support – Modern interface and flexible power input.
Full UNO Compatibility – Works with shields, libraries, and community resources.
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Applications:
IoT Projects – Connect devices to the internet seamlessly via WiFi.
Robotics & Automation – Handle real-time processing with expanded memory.
Automotive Systems – Use CAN bus for multi-board communication and control.
STEM Education – Perfect for learning embedded systems with modern features.
Signal Processing – Utilize the 12-bit DAC for audio, waveform generation, and control applications.
Industrial Prototyping – Suitable for smart sensors, controllers, and automation tasks.
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| General Specifications |
| Processor | Renesas RA4M1 Arm Cortex®-M4, 48MHz |
| SRAM | 32kB |
| Flash Memory | 256kB |
| DAC | 12-bit |
| Connectivity | WiFi, CAN bus |
| USB Interface | USB-C |
| Operating Voltage | 5V |
| Input Voltage (Recommended) | Up to 24V |
| Backward Compatibility | Arduino UNO shields & libraries |
| Shipment Weight | 0.0437 kg |
| Shipment Dimensions | 8 × 6 × 3 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
INTRODUCTION
The new Arduino UNO R4 development board comes in two versions: the UNO R4 WiFi and the UNO R4 Minima. It runs on the Renesas RA4M1 (Arm Cortex®-M4) processor with a clock speed of 48MHz, which provides a 3x increase over the UNO R3. In addition to that, the SRAM has been upgraded from 2kB to 32kB and the flash memory has been increased from 32kB to 256kB to accommodate to more complex projects. Furthermore, in response to requests from the Arduino community, the USB port has been upgraded to USB-C and the maximum power supply voltage has been increased to 24V. The board provides a CAN bus, allowing users to minimize wiring and perform different tasks by connecting multiple extension boards. Finally, the new board also includes a 12-bit analog DAC.
The WiFi version comes with an Espressif S3 WiFi module, expanding creative opportunities for makers, educators, and hobbyists alike.
Based on the success of UNO R3, the UNO R4 board is the ideal prototype and learning tool for anyone. While retaining the well-known features of the UNO series, such as standard form factor, shield compatibility, 5V voltage, and robustness, new features have been added.
Thanks to its powerful design and reliable performance, the UNO R4 is a valuable addition to the Arduino ecosystem, suitable for beginners and experienced electronics enthusiasts alike to deploy their own projects.
Figure: Board Overview
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The new Arduino UNO R4 takes everything you love about the classic UNO R3 and makes it faster, stronger, and more versatile for your projects. Powered by a modern Renesas RA4M1 Arm Cortex®-M4 processor running at 48 MHz (a big step up from the R3’s 16 MHz ATmega328P), it delivers smoother performance and greater efficiency. You’ll have plenty of room for your ideas too, with 32 KB of SRAM (16× more than the UNO R3) and a massive 256 KB of flash storage compared to just 32 KB on the older board. Everyday usability has also been upgraded: the UNO R4 features a USB-C port for easy connection and a higher 24 V input voltage tolerance, giving you more flexibility in powering your creations. Whether you’re a beginner or an experienced maker, the UNO R4 is designed to handle more complex projects while keeping the familiar UNO experience you already know.
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Why Upgrade to Arduino UNO R4 Over the Classic UNO R3?
Hardware compatibility with UNO form factor
The UNO R4 WiFi maintains the same form factor, pinout, and 5 V operating voltage as its predecessor, the UNO R3, ensuring a seamless transition for existing shields and projects.
Expanded memory and faster clock
The UNO R4 WiFi boasts increased memory and a faster clock speed, enabling more precise calculations and effortless handling of complex projects.
Extra on-board peripherals
The UNO R4 WiFi introduces a range of on-board peripherals, including a 12-bit DAC, CAN BUS, and OP AMP, providing expanded capabilities and design flexibility.
Extended 24 V tolerance
The UNO R4 WiFi supports a wider input voltage range, allowing seamless integration with motors, LED strips, and other actuators using a single power source.
HID support
With built-in HID support, the UNO R4 WiFi can simulate a mouse or keyboard when connected to a computer via USB, making it easy to send keystrokes and mouse movements.
Wi-Fi® and Bluetooth®
The UNO R4 WiFi hosts an ESP32-S3 module, enabling makers to add wireless connectivity to their projects. Combined with the Arduino IoT Cloud, makers can monitor and control their projects remotely.
QWIIC connector
The UNO R4 WiFi features a Qwiic I2C connector, allowing easy connection to nodes from the extensive QWIIC ecosystem. Adapter cables also enable compatibility with sensors and actuators based on other connectors.
Support for battery-powered RTC
The UNO R4 WiFi includes additional pins, including an "OFF" pin to turn off the board and a "VRTC" pin to keep the internal Real-Time Clock powered and running.
LED matrix
The UNO R4 WiFi incorporates a bright 12x8 red LED matrix, ideal for creative projects with animations or plotting sensor data, eliminating the need for additional hardware.
Diagnostics for runtime errors
The UNO R4 WiFi includes an error-catching mechanism that detects runtime crashes and provides detailed explanations and hints about the code line causing the crash.
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Package Includes:
1 x Arduino UNO R4 WiFi Development Board Original
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