The user-friendly UNO just took a quantum leap forward: UNO R4 is a 32-bit microprocessor offering more speed, memory, connectors and connectivity options than any version of the board before.
The UNO R4 is powered by the Renesas RA4M1 32-bit ARM Cortex-M4 processor, providing a significant boost in processing power, memory, and functionality.
The WiFi version comes with an ESP32-S3 WiFi module in addition to the RA4M1, expanding creative opportunities for makers and engineers.
The UNO R4 runs at 48 MHz, which provides a 3x increase over the popular Uno R3.
Additionally, SRAM has been upgraded from 2 kB to 32 kB, and flash memory from 32kB to 256kB to support more complex projects.
The USB port is now USB-C, and the maximum power supply voltage has been raised to 24V with an enhanced thermal design.
The board includes a CAN bus and an SPI port, enabling users to reduce wiring and perform parallel tasks by connecting multiple shields.
A 12-bit analog DAC is also provided on the board.
All this as well as WiFi and Bluetooth connectivity, a 12 x 8 LED matrix, and a Qwiic connector.
The UNO R4 WiFi provides the same pinout and 5V operating voltage as the UNO R3.
This means that existing expansion cards/shields and projects can be easily migrated to the new board.
Notes:
This version is not manufactured by Arduino.cc
On ESP header: the ESP32-S3 module on this board operates on 3.3V. The ESP header located close to the USB-C connector is 3.3V only and should not be connected to5 V.
This may damage your board.
Maximum current draw per pin: the UNO R4 series’ maximum current draw per GPIO is 8 mA, which is significantly lower than previous versions.
For example, when using an external LED use a 420Ω current limiting resistor. Exceeding this limit may damage your pin / board.
