Arduino UNO R4 WiFi – 5 V, Wi-Fi/BLE, LED Matrix

Arduino UNO R4 WiFi (ABX00087)

Level up your classic UNO projects without breaking shield compatibility. The UNO R4 WiFi merges a 32-bit Renesas RA4M1 MCU with an ESP32-S3 for Wi-Fi®/Bluetooth® 5, adds a built-in 12×8 LED matrix, Qwiic/STEMMA QT connector, and quality-of-life upgrades like USB-C, a true 12-bit DAC, and CAN (via external transceiver). Perfect for students, makers, and IoT prototypes in PH.

• Stay 5 V compatible: works with most UNO shields and tutorials.
• Connected out of the box: Wi-Fi/BLE via ESP32-S3; great with Arduino IoT Cloud.
• Visual feedback on board: program the 12×8 LED matrix for icons, text, or debug info.
• Plug-and-play sensors: Qwiic/STEMMA QT port for no-solder I²C add-ons.
• Creator-friendly I/O: true 12-bit DAC, on-chip op-amp, CAN controller.
• USB-C + HID: can emulate keyboard/mouse for creative control projects.

Key Specifications

• Main MCU: Renesas RA4M1 (Arm® Cortex®-M4 @ 48 MHz)
• Wireless: ESP32-S3 (802.11 b/g/n Wi-Fi, Bluetooth® LE 5)
• Memory (RA4M1): 256 kB Flash, 32 kB SRAM; plus 8 kB data flash
• USB: USB-C® (power & programming)
• GPIO: 14 digital; 6 analog inputs; 1× DAC (12-bit); PWM on designated pins
• Buses: UART, I²C, SPI, CAN (transceiver required)
• Extras: 12×8 LED matrix, Qwiic/STEMMA QT port, VRTC & OFF pins
• Logic voltage: 5 V (ESP32-S3 domain 3.3 V); VIN: 6–24 V
• Form factor: 68.6 × 53.4 mm (UNO)

What can you build?

IoT dashboards and data loggers, BLE remote controllers, Wi-Fi sensor nodes, classroom demos using the LED matrix, art/installations, HID-based automation and more.