Arduino UNO R4 WiFi
Arduino's flagship UNO board upgraded with Renesas RA4M1 ARM Cortex-M4F at 48MHz, ESP32-S3 WiFi/BLE 5.0, built-in 12×8 LED matrix, 12-bit DAC, CAN bus, op-amp, and Qwiic connector — all in the classic UNO form factor at 5V.
$22.00
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Specifications
Components
Renesas RA4M1 ARM Cortex-M4F at 48MHz with FPU, DSP, 256KB flash, 32KB SRAM, 14-bit ADC, 12-bit DAC, CAN 2.0B, USB 2.0 Full-Speed, and capacitive touch sensing.
Espressif ESP32-S3 module with Xtensa LX7 dual-core at 240MHz, 8MB flash, WiFi 802.11 b/g/n, and Bluetooth LE 5.0. Handles wireless connectivity, OTA updates, and USB bridge.
Built-in Charlieplexed 12×8 red LED matrix for displaying animations, sensor readings, custom graphics, and scrolling text without an external display.
Bus Interfaces
GPIO Map
Overview
The Arduino UNO R4 WiFi is the latest evolution of the world's most popular development board. It replaces the ATmega328P with a Renesas RA4M1 ARM Cortex-M4F running at 48MHz, delivering significantly more processing power, memory (256KB flash, 32KB SRAM), and new peripherals including a 12-bit DAC, CAN 2.0B bus, and an on-chip op-amp — all while maintaining full pin and shield compatibility with the classic UNO R3 form factor.
The board integrates an ESP32-S3-MINI-1-N8 module that provides WiFi 802.11 b/g/n and Bluetooth LE 5.0 connectivity, enabling IoT projects, cloud integration via Arduino IoT Cloud, and over-the-air updates. A unique 12×8 red LED matrix on the top of the board can display animations, sensor data, or custom graphics without any external display. The Qwiic/STEMMA QT connector makes it easy to daisy-chain I2C sensors and peripherals.
With USB-C connectivity, HID support for keyboard/mouse emulation, extended 6-24V input voltage tolerance, and a real-time clock with VRTC battery backup pin, the UNO R4 WiFi bridges the gap between beginner-friendly Arduino development and advanced embedded applications. It is fully supported by the Arduino IDE, Arduino Cloud, and MicroPython.
Use Cases
5Educational Platform
Development boards suitable for teaching programming, electronics, and embedded systems concepts.
IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
home-automation
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Signal Generator
Build a function generator producing sine, square, triangle, and arbitrary waveforms using the board's built-in DAC.
Resources
Where to Buy
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