Arduino UNO R4 WiFi

The Arduino UNO R4 WiFi combines the powerful 32-bit Renesas RA4M1 processor with an ESP32-S3 coprocessor for built-in WiFi and Bluetooth Low Energy connectivity. It's the most capable UNO ever made, featuring a striking 12×8 LED matrix, Qwiic connector, and all the new R4 capabilities.

Fully backward compatible with UNO R3 shields and projects, the R4 WiFi adds wireless IoT connectivity while maintaining the familiar Arduino form factor. The onboard LED matrix enables creative displays, animations, and visual feedback without additional hardware.

Key Features

• Renesas RA4M1 Processor – 32-bit Arm Cortex-M4 at 48 MHz
• ESP32-S3-MINI Coprocessor – Built-in WiFi and Bluetooth Low Energy
• 12×8 LED Matrix – 96 addressable red LEDs for displays and animations
• 256KB Flash / 32KB SRAM – Significantly more memory than UNO R3
• USB-C Connectivity – Modern programming port with HID device support
• Qwiic I2C Connector – Easy connection to Qwiic/STEMMA QT sensors
• CAN Bus – Built-in support for industrial automation protocols
• 12-bit DAC – True analog output for audio and signal generation
• RTC with Battery Backup – Keep time when powered off
• Wide Input Voltage – 6-24V via VIN pin

Ideal For

• IoT and connected device projects
• Projects requiring visual LED feedback
• Wireless sensor networks
• Upgrading existing UNO projects with connectivity

Compatibility

• Arduino UNO R3 shields (pin-compatible)
• Qwiic/STEMMA QT ecosystem
• Arduino IDE 2.x
• Arduino IoT Cloud

Package Contents

• 1× Arduino UNO R4 WiFi

Resources

• Arduino Documentation