# 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.

## Quick Facts

- **Brand:** Arduino
- **Board Type:** dev-board
- **Price:** ~$22
- **Product Readiness:** consumer
- **CPU:** ARM Cortex-M4F @ 48MHz, FPU, DSP
- **CPU Architecture:** ARM Cortex-M4F
- **CPU Cores:** 1
- **RAM:** 32KB SRAM
- **Flash:** 256KB,8KB EEPROM
- **USB:** USB-C 2.0 (Full-Speed)
- **Power:** 5V via USB-C or 6-24V via Vin
- **Operating Voltage:** 5V
- **Operating Temp:** -40°C to 105°C
- **Dimensions:** 68.85 × 53.34mm
- **Weight:** 25g
- **Antenna:** Built-in PCB antenna
- **SD Card:** No

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** No

## Compatible Firmware

arduino, micropython

## Use Cases

- educational-platform
- iot
- home-automation
- environmental-monitoring
- signal-generator

## Components

- **R7FA4M1AB3CFM** (mcu): 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. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2Fra4m1-datasheet.pdf&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- **ESP32-S3-MINI-1-N8** (mcu): 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. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3-mini-1_mini-1u_datasheet_en.pdf&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- **12x8 LED Matrix** (led-driver): Built-in Charlieplexed 12×8 red LED matrix for displaying animations, sensor readings, custom graphics, and scrolling text without an external display. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Ftutorials%2Funo-r4-wifi%2Fled-matrix%2F&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)

## Protocols

- **SPI**: SS: D10, MOSI: D11, MISO: D12, SCK: D13
- **I2C**: SDA: A4/SDA, SCL: A5/SCL
- **UART**: RX: D0, TX: D1
- **CAN**: CANRX: D4, CANTX: D5
- **DAC**: DAC0: A0
- **PWM**

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| D0 | RX — UART Receive | UART | digital-input, digital-output |
| D1 | TX — UART Transmit | UART | digital-input, digital-output |
| D2 | Digital I/O |  | digital-input, digital-output |
| D3 | PWM Output | PWM | digital-input, digital-output, pwm |
| D4 | CAN RX | CAN | digital-input, digital-output |
| D5 | CAN TX / PWM | CAN | digital-input, digital-output, pwm |
| D6 | PWM Output | PWM | digital-input, digital-output, pwm |
| D7 | Digital I/O |  | digital-input, digital-output |
| D8 | Digital I/O |  | digital-input, digital-output |
| D9 | PWM Output | PWM | digital-input, digital-output, pwm |
| D10 | SPI SS / PWM | SPI | digital-input, digital-output, pwm |
| D11 | SPI MOSI / PWM | SPI | digital-input, digital-output, pwm |
| D12 | SPI MISO | SPI | digital-input, digital-output |
| D13 | SPI SCK / LED | SPI | digital-input, digital-output |
| A0 | Analog Input / DAC Output | ADC | digital-input, digital-output, adc, dac |
| A1 | Analog Input | ADC | digital-input, digital-output, adc |
| A2 | Analog Input | ADC | digital-input, digital-output, adc |
| A3 | Analog Input | ADC | digital-input, digital-output, adc |
| A4 | I2C SDA / Analog Input | I2C | digital-input, digital-output, adc |
| A5 | I2C SCL / Analog Input | I2C | digital-input, digital-output, adc |

## Description

## 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.

## Where to Buy

- [Arduino Store (US)](https://openhardware.directory/r?to=https%3A%2F%2Fstore-usa.arduino.cc%2Fproducts%2Funo-r4-wifi&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $22.00
- [Arduino Store (EU)](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Funo-r4-wifi&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — €24.40
- [DigiKey](https://openhardware.directory/r?to=https%3A%2F%2Fwww.digikey.com%2Fen%2Fproducts%2Fdetail%2Farduino%2FABX00087%2F20371539&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $27.50
- [Mouser](https://openhardware.directory/r?to=https%3A%2F%2Fwww.mouser.com%2FProductDetail%2FArduino%2FABX00087&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $27.50
- [Amazon US](https://openhardware.directory/r?to=https%3A%2F%2Fwww.amazon.com%2FArduino-UNO-WiFi-ABX00087-Bluetooth%2Fdp%2FB0C8V88Z9D&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $27.50
- [SparkFun](https://openhardware.directory/r?to=https%3A%2F%2Fwww.sparkfun.com%2Farduino-uno-r4-wifi.html&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $27.50
- [The Pi Hut (UK)](https://openhardware.directory/r?to=https%3A%2F%2Fthepihut.com%2Fproducts%2Farduino-uno-r4-wifi&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — £18.00
- [PiShop US](https://openhardware.directory/r?to=https%3A%2F%2Fwww.pishop.us%2Fproduct%2Farduino-uno-r4-wifi%2F&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export) — $27.50

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fstore.arduino.cc%2Fproducts%2Funo-r4-wifi&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Farduino%2Funo-r4-wifi-usb-bridge&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- [wiki](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fhardware%2Funo-r4-wifi%2F&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- [datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fdatasheets%2FABX00087-datasheet.pdf&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)
- [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fdocs.arduino.cc%2Fresources%2Fschematics%2FABX00087-schematics.pdf&ref=openhardware.directory&product=arduino-uno-r4-wifi&source=md-export)

## Tags

`arduino`, `uno-r4`, `wifi`, `ble`, `arm-cortex-m4`, `renesas`, `esp32-s3`, `iot`, `led-matrix`, `can-bus`, `dac`, `usb-c`, `qwiic`

## Images

![Arduino UNO R4 WiFi](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-wifi/b9f616fd6f29.jpg)
![Arduino UNO R4 WiFi](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-wifi/17c226f10324.jpg)
![Arduino UNO R4 WiFi](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-wifi/849b4ea1e8c8.jpg)
![Arduino UNO R4 WiFi](https://nbg1.your-objectstorage.com/openhardware-directory/entities/arduino-uno-r4-wifi/04a730be8ee0.jpg)

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