Arduino UNO R4 WiFi Development Board

The Arduino UNO R4 WiFi Development Board marks a significant evolution in the iconic UNO series, introducing a powerful 32-bit microcontroller architecture and integrated wireless connectivity for the first time. This board is built around the Renesas RA4M1 series microcontroller (R7FA4M1AB3CFM#AA0), featuring a 48MHz Arm® Cortex®-M4 microprocessor for enhanced computational power. It is paired with a dedicated ESP32-S3 Wi-Fi® module (ESP32-S3-MINI-1-N8), which provides both Wi-Fi® and Bluetooth® connectivity via a built-in antenna. Communication between the main and wireless MCUs is managed by a logic-level translator, ensuring seamless integration.

A major upgrade is its expanded memory, offering 256KB of flash, 32KB of SRAM, and 8KB of EEPROM, providing ample space for more complex sketches and data storage. The board operates with a 5V logic level from the RA4M1, while the ESP32-S3 module runs at 3.3V. It supports versatile power options: via a 6-24V input through a barrel jack (connected to the VIN pin) or directly through the modern USB-C® port at 5V.

Key Features & Specifications

• Wireless Connectivity: Integrated Wi-Fi® 4 support (802.11 b/g/n) on the 2.4GHz band, with data rates up to 150Mbps, plus Bluetooth®.
• Rich I/O & Communication: Features include 1x UART, 1x SPI, 1x I2C, and 1x CAN bus, offering extensive interfacing capabilities for sensors, actuators, and other peripherals.
• Advanced Analog & Digital: Incorporates a capacitive touch sensing unit, a USB 2.0 full-speed module, and high-resolution up to 14-bit ADC and DAC alongside an operational amplifier for precision signal conditioning.
• Compact Form Factor: Maintains the classic UNO footprint with dimensions of 68.6mm x 53.4mm, ensuring compatibility with most existing shields and accessories.

Ideal for hobbyists, educators, and professional developers, the UNO R4 WiFi is a