Arduino UNO R4 WiFi Development Board
32-Bit ARM Performance with Built-In Wi-Fi, Bluetooth & 12x8 LED Matrix
The Arduino UNO R4 WiFi (SKU: ABX00087) blends the performance of 32-bit ARM processing with dual wireless connectivity and creative visual hardware, establishing a new standard for IoT development. At its core is the 32-bit Renesas RA4M1 microcontroller featuring an ARM Cortex-M4 processor running at 48 MHz with 256 KB Flash and 32 KB SRAM—delivering 3x the speed and 8x the memory of the classic UNO R3. It operates natively on 5V logic to maintain full backward compatibility with standard 5V UNO shields and modules, while modernizing connectivity with a USB Type-C port and a heavy-duty DC step-down regulator supporting up to 24V input.
What sets the UNO R4 WiFi apart is its integrated ESP32-S3 co-processor alongside an eye-catching 12x8 red LED matrix built directly onto the board. The ESP32-S3 module provides 2.4 GHz Wi-Fi 4 and Bluetooth 5 (LE) connectivity, allowing seamless integration with the Arduino Cloud platform or custom local network setups without compromising main MCU performance. Meanwhile, the 96-pixel Charlieplexed LED matrix lets developers render custom animations, telemetry readouts, or UI icons straight out of the box. Added features such as a 12-bit DAC, CAN bus controller hardware, an onboard Qwiic I2C connector, an RTC pin, and a dedicated 3.3V power regulator make this board an all-in-one powerhouse for smart home devices, IoT gateways, and educational electronics.
Technical Specifications
| Feature | Specification Details |
| Main Microcontroller | Renesas RA4M1 (Arm® Cortex®-M4 @ 48 MHz) |
| Wireless Module | Espressif ESP32-S3-MINI-1-N8 (Wi-Fi 4 + Bluetooth 5 LE) |
| Memory (Main MCU) | 256 KB Flash, 32 KB SRAM, 8 KB EEPROM (Data Flash) |
| Memory (Wireless MCU) | 384 KB ROM, 512 KB SRAM |
| Logic Operating Voltage | 5V Native (ESP32-S3 translated to 3.3V) |
| Input Voltage ($V_{IN}$) | 6V – 24V DC (via DC Barrel Jack or VIN pin) |
| On-Board Display | 12x8 Red LED Matrix (96 individual Charlieplexed LEDs) |
| Digital I/O Pins | 14 total (6 PWM-capable, up to 8 mA drive) |
| Analog Inputs / Outputs | 6 Analog Inputs (up to 14-bit ADC) / 1x 12-bit DAC Output |
| Onboard Expansion | 1x Qwiic $\text{I}^2\text{C}$ connector, 10-pin ESP32 header, SWD debug header |
| Hardware Peripherals | CAN Bus, Operational Amplifier (OPAMP), RTC, CTSU Touch |
| Interfaces | USB-C® (HID / Serial), 1x UART, 1x SPI, 1x $\text{I}^2\text{C}$, 1x CAN |