Arduino Uno R4 WiFi: 32-Bit ARM & Renesas

A closer look at the Arduino Uno R4 WiFi, featuring the Renesas RA4M1 ARM Cortex-M4, ESP32-S3 connectivity, LED matrix, power management.

MATEO GARCIA

Arduino 5.png Programming the R4 is handled through the modern Arduino IDE (v2.0 and above). By installing the Arduino Uno R4 Boards package via the Board Manager, the IDE invokes the GNU Arm Embedded Toolchain (arm-none-eabi-g++) behind the scenes to compile code for the Cortex-M4 core—the same underlying toolchain used by STM32 and Raspberry Pi Pico boards. Portable Network Graphics (PNG) - 585.98 kB - 08/07/2026 at 23:21		Preview