EmbeddedRelated.com
The 2026 Embedded Online Conference
    Parts   Development Boards  Arduino & Compatible    Arduino Boards Family    ABX00087    ABX00087
Arduino UNO R4 WiFi

Arduino UNO R4 WiFi

MPN: ABX00087
Arduino
The Arduino UNO R4 WiFi features a 32-bit Renesas RA4M1 microcontroller (48 MHz ARM Cortex M4) and ESP32-S3-MINI-1-N8 WiFi module. The board features enhanced memory specifications with 256kB flash, 32kB SRAM, and 8kB EEPROM, while supporting both WiFi (802.11 b/g/n) and Bluetooth® 5.x connectivity at 2.4GHz. This combination of features makes it a versatile platform for wireless communication projects and IoT applications, offering significantly more processing power and connectivity options than previous UNO models.
Active2,803 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The Arduino UNO R4 WiFi is a significant evolution of the classic UNO platform, featuring a 48 MHz Renesas RA4M1 Arm Cortex-M4 microcontroller and an ESP32-S3-MINI-1-N8 for wireless connectivity. It upgrades the ecosystem to 32-bit architecture while maintaining the 5V logic and form factor compatibility that engineers and makers rely on. This board integrates a 12x8 LED matrix for visual feedback and a Qwiic connector for rapid I2C prototyping.

Why Choose This Part

The R4 WiFi provides a seamless migration path for 5V projects that require more RAM (32kB) and Flash (256kB) than the R3. It eliminates the need for external level shifters in legacy circuits while offering modern features like a 12-bit DAC, CAN bus support, and a wide 6V to 24V input voltage range.

Applications

IoT Prototyping
Utilizing the onboard ESP32-S3 module for Wi-Fi and Bluetooth connectivity to create connected sensors or smart home gateways.
Human-Machine Interface
Leveraging the integrated 12x8 LED matrix for displaying scrolling text, animations, and system status without external displays.
Embedded Signal Processing
Taking advantage of the Arm Cortex-M4 FPU and 14-bit ADC for real-time sensor data analysis and filtering.
Industrial Interfaces
Implementing vehicle and industrial communication via the built-in CAN bus controller and 5V tolerant I/O.

Key Specifications

Type Transceiver; 802.11 b/g/n (Wi-Fi, WiFi, WLAN), Bluetooth 5.x (BLE)
Contents Board(s)
Frequency 2.4GHz
Utilized IC / Part ESP32-S3-MINI, R7FA4M1, RA41M1

Getting Started

Start by installing the Arduino IDE and the UNO R4 board package. Connect via the USB-C port to flash code and use the Arduino Cloud for easy IoT dashboard integration. Developers can also utilize the Renesas RA flexible software package (FSP) for more advanced bare-metal programming of the RA4M1 core.

Categories

Development Boards > Arduino & Compatible Education & Prototyping > Arduino Ecosystem
The 2026 Embedded Online Conference