What it is

The Arduino Uno R4 is the fourth generation of the iconic Arduino Uno, available in Minima (Renesas RA4M1 only) and WiFi variants (RA4M1 + ESP32-S3 coprocessor). It maintains full Arduino Uno R3 pin compatibility while offering a significantly more powerful 48 MHz Cortex-M4 processor, more flash/RAM, and optional built-in WiFi and Bluetooth.