Arduino UNO R4 Minima – The Next Generation of the Classic Board with 32-bit Arm® Cortex®-M4

Faster and with More Memory: 256KB Flash, 32KB SRAM, Built-in DAC, RTC and HID Support

The UNO R4 Minima Development Board is a next-generation Arduino UNO board featuring the powerful Renesas RA4M1 (ARM Cortex-M4) microcontroller. It combines the familiar UNO form factor and 5 V logic with enhanced processing power, larger memory, and modern peripherals, making it ideal for a broad range of embedded systems and learning projects.

Key Features:

• MCU: Renesas RA4M1 (ARM Cortex-M4 @ 48 MHz).

• Memory: 256 KB Flash, 32 KB SRAM, and 8 KB EEPROM for complex sketches and data.

• Operating Voltage: 5 V logic – compatible with many Arduino UNO shields.

• Power Input: VIN supports 6–24 V for flexible power options.

• I/O:
  • 14 digital I/O pins (6 PWM)
  • 6 analog inputs (ADC up to 14-bit)
  • 1 × 12-bit DAC for analog output

• Comms: UART, SPI, I²C, plus CAN Bus (requires external transceiver).

• USB-C: Modern USB-C port for programming and power.

• Extras: Built-in RTC, HID support for keyboard/mouse emulation, and SWD debug port.

Typical Uses:
✔ Education and beginners’ projects.
✔ Embedded system prototyping.
✔ Automation and control systems.
✔ Analog and audio signal applications.

Note: While physically UNO R3 compatible, some software libraries might need updates due to the ARM architecture change.