Arduino UNO R4 – Powerful 32‑bit MCU for Modern IoT Projects Compatible

The Arduino UNO R4 is the next‑generation upgrade to the classic UNO, featuring a 32‑bit Renesas RA4M1 microcontroller for enhanced performance, memory, and connectivity. Designed for modern IoT and embedded projects, it maintains full compatibility with existing UNO shields and accessories while offering advanced features for demanding applications.
With its USB‑C interface, expanded memory, faster clock speed, and robust peripherals, the UNO R4 is ideal for students, makers, and professionals building IoT devices, robotics, automation systems, and smart electronics.

Specifications

• Microcontroller: Renesas RA4M1 (Arm Cortex‑M4, 32‑bit)
• Clock Speed: 48 MHz
• Flash Memory: 256 KB
• SRAM: 32 KB
• Operating Voltage: 5V
• I/O Pins: 14 digital I/O (PWM capable), 6 analog inputs
• Communication Interfaces: UART, I²C, SPI, CAN bus (UNO R4 Minima/WiFi variants)
• USB Interface: USB‑C (programming + power)
• Compatibility: Fully compatible with Arduino UNO shields and libraries
• Variants: UNO R4 Minima, UNO R4 WiFi (with ESP32‑S3 coprocessor)
• Applications: IoT projects, robotics, automation, sensor networks, smart devices

Features

• 32‑bit Arm Cortex‑M4 MCU for modern IoT applications
• USB‑C connector for reliable power and programming
• Expanded memory and faster processing compared to UNO R3
• Backward compatibility with UNO shields and libraries
• Built‑in CAN bus and DAC support (advanced peripherals)
• WiFi variant available for wireless IoT projects
• Ideal for students, makers, and professionals

*Image shown is a representation only.