FLASHABLE
Menu
Arduino · Renesas RA4M1 plus ESP32-S3 connectivity module

UNO R4 WiFi projects and builds

UNO-form-factor board pairing a 32-bit Renesas MCU with ESP32-S3 connectivity, a 12×8 LED matrix and Qwiic connector.

Official page ↗Buying-link policy
UNO R4 WiFi product photograph
Image: Arduino product photography ↗ · Original image asset ↗Manufacturer product photograph copied locally at reduced WebP resolution solely to identify the device in independent editorial coverage. The image is attributed and linked to its original product page, is not used as a brand asset or endorsement, and should be removed if the rights holder objects.

Why it belongs on the bench

Arduino UNO R4 WiFi keeps the familiar UNO footprint and 5 V I/O while moving sketches to a 32-bit Renesas RA4M1 and using an ESP32-S3 module for USB and wireless connectivity. A 12×8 LED matrix, Qwiic connector and CAN interface make it suitable for the catalogue’s matrix animations and deeper USB-bridge firmware work. Existing UNO shields still need electrical and software review: the new processor is not binary-compatible with AVR-era code, and 5 V logic can conflict with 3.3 V peripherals. Reflashing the ESP32-S3 bridge is an advanced recovery or development task, not a normal sketch upload.

Explore more Arduino devices and projects.

Sources

Sources and further reading

Original project pages, manufacturer documentation and repositories used while preparing this page. Last reviewed .

  1. UNO R4 WiFi official pageArduino
  2. arduino/ArduinoCore-renesas — Libraries / Arduino LED MatrixGitHub repository
  3. arduino/uno-r4-wifi-usb-bridgeGitHub repository

UNO R4 WiFi projects and open-source builds

01
advancedtime varies1 device

UNO R4 WiFi examples

Inspect or rebuild the ESP32-S3 USB-bridge and connectivity firmware used alongside the UNO R4's Renesas processor.

device firmware

Useful alternatives to UNO R4 WiFi

Wio Terminal product photograph
Seeed Studio product photography ↗
Seeed Studiointermediate

Wio Terminal

ATSAMD51 all-in-one development terminal with a 2.4-inch LCD, controls, sensors, wireless networking and Grove expansion.

Platform
Microchip ATSAMD51P19 plus Realtek RTL8720DN wireless coprocessor · Arduino
Builds
01
Nano ESP32 product photograph
Arduino product photography ↗
Arduinointermediate

Nano ESP32

Nano-form-factor ESP32-S3 board supporting Arduino and MicroPython workflows with Wi-Fi and Bluetooth LE.

Platform
u-blox NORA-W106 module with Espressif ESP32-S3 · Arduino
Builds
02
Nicla Vision product photograph
Arduino product photography ↗
Arduinointermediate

Nicla Vision

Compact machine-vision board with a 2 MP camera, dual-core STM32H7, microphone, IMU and time-of-flight distance sensor.

Platform
STM32H747A dual-core Cortex-M7/M4
Builds
02