Description
The Arduino 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 Minima is an affordable option for those who don't need the additional features.
The Arduino 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 32 kB to 256 kB to support more complex projects. Responding to community feedback, the USB port is now USB-C, and the maximum power supply voltage has been raised to 24 V 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.
The Arduino Uno R4 comes in 2 versions (Minima and WiFi) and offers the following new features compared to the Uno R3:
| Arduino Uno R4 Minima | Arduino Uno R4 WiFi |
| USB-C connector | USB-C connector |
| RA4M1 from Renesas (Cortex-M4) | RA4M1 from Renesas (Cortex-M4) |
| HID device (emulate a mouse or a keyboard) | HID device (emulate a mouse or a keyboard) |
| Improved power section (up to 24 V through VIN) | Improved power section (up to 24 V through VIN) |
| CAN bus | CAN bus |
| DAC (12 bits) | DAC (12 bits) |
| Op amp | Op amp |
| | WiFi/Bluetooth LE |
| | Fully-addressable LED matrix (12x8) |
| | Qwiic I²C connector |
| | RTC (with support for a buffer battery) |
| | Runtime errors diagnostics |
Model Comparison
| | Uno R3 | Uno R4 Minima | Uno R4 WiFi |
| Microcontroller | Microchip ATmega328P (8-bit AVR RISC) | Renesas RA4M1 (32-bit ARM Cortex-M4) | Renesas RA4M1 (32-bit ARM Cortex-M4) |
| Operating Voltage | 5 V | 5 V | 5 V |
| Input Voltage | 6-20 V | 6-24 V | 6-24 V |
| Digital I/O Pins | 14 | 14 | 14 |
| PWM Digital I/O Pins | 6 | 6 | 6 |
| Analog Input Pins | 6 | 6 | 6 |
| DC Current per I/O Pin | 20 mA | 8 mA | 8 mA |
| Clock Speed | 16 MHz | 48 Mhz | 48 Mhz |
| Flash Memory | 32 KB | 256 KB | 256 KB |
| SRAM | 2 KB | 32 KB | 32 KB |
| USB | USB-B | USB-C | USB-C |
| DAC (12 bit) | – | 1 | 1 |
| SPI | 1 | 2 | 2 |
| I²C | 1 | 2 | 2 |
| CAN | – | 1 | 1 |
| Op amp | – | 1 | 1 |
| SWD | – | 1 | 1 |
| RTC | – | – | 1 |
| Qwiic I²C connector | – | – | 1 |
| LED Matrix | – | – | 12x8 (96 red LEDs) |
| LED_BUILTIN | 13 | 13 | 13 |
| Dimensions | 68.6 x 53.4 mm | 68.9 x 53.4 mm | 68.9 x 53.4 mm |
Downloads
