Description The R4 WiFi is designed around the 32-bit microcontroller RA4M1 from Renesas while also featuring a ESP32 module for Wi-Fi and Bluetooth connectivity. Its distinctive 12x8 LED matrix makes it possible to prototype visuals directly on the board, and with a Qwiic connector, you can create projects plug-and-play style. The MCU on the board is the high performance Renesas RA4M1 (Arm Cortex-M4) with a 48 MHz clock speed, 32 kB SRAM and 256 kB flash memory. This MCU features an RTC, a DAC and a CAN bus and has support for HID via USB. The UNO R4 WiFi also features an ESP32-S3 for Wi-Fi/Bluetooth connectivity, which can also be separately programmed via a specific header. Note on ESP header: the ESP32-S3 module on this board operates on 3.3 V. The ESP header located close to the USB-C connector is 3.3V only and should not be connected to 5 V. This may damage your board. Note on Qwiic connector: the Qwiic connector on this board is connected to a secondary I2C bus on this board, IIC0. This connector is 3.3 V only, connecting higher voltages may damage your board. To initialize this bus, use Wire1.begin() instead. Maximum current draw per pin: the UNO R4 series' maximum current draw per GPIO is 8 mA, which is significantly lower than previous versions. Exceeding this limit may damage your pin / board.