Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Microcontroller | Renesas RA4M1 (ARM Cortex-M4) |
| Operating Voltage | 5V |
| Digital I/O Pins | 14 (6 PWM outputs) |
| Analog Input Pins | 6 |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Clock Speed | 48 MHz |
| Connectivity | USB-C, WiFi (WiFi version only) |
| Power Supply | 7-15V via VIN or 5V via USB |
| Dimensions | 68.58 x 53.34 mm |
Anonymous
Mar 25, 2026
Rating: 4/5
Great board, but pinout learning curve
Love the speed and the USB-C port. However, if you are used to the old AVR architecture, some peripheral libraries behave slightly differently. Once you get past that, it's fantastic.
Anonymous
Mar 25, 2026
Rating: 5/5
Huge upgrade from the classic Uno
The switch to the ARM Cortex-M4 processor makes a noticeable difference in performance. The extra memory allows for much more complex sketches without running out of space. Highly recommended for intermediate users.
Anonymous
Mar 17, 2026
Rating: 5/5
Best value for learning embedded systems
As a student, this board offers incredible value. The 32-bit architecture gives me room to grow before I need to jump to ESP32 or STM32 custom boards. Documentation is solid.
Anonymous
Mar 17, 2026
Rating: 5/5
Perfect for IoT projects with WiFi
I bought the WiFi version specifically for a home automation sensor node. Setting up the WiFi connection was straightforward using the new Arduino WiFi library. Stable and reliable.
Anonymous
Mar 03, 2026
Rating: 5/5
USB-C is a game changer
Finally, an Arduino Uno that uses USB-C! No more digging for mini-USB cables. The board feels sturdy, and the LED matrix feature on the R4 is a nice bonus for debugging.
Anonymous
Mar 01, 2026
Rating: 4/5
Solid hardware, missing some legacy compatibility
The hardware is top-notch and very fast. Just be aware that some very old libraries written specifically for ATmega328P might need minor tweaks to compile correctly on the RA4M1.
Q: How much current can the 5V pin output?
A: The 5V pin can supply current derived from the USB source or the VIN regulator. When powered via USB, it is limited by the USB port (typically 500mA). When powered via VIN, the onboard regulator limits the total board consumption, so careful calculation is needed for high-draw peripherals.
Q: Does the IDE need to be updated to use the R4 boards?
A: Yes, you need Arduino IDE version 2.0 or later, and you must install the 'Arduino Renesas Boards' package via the Boards Manager to compile and upload code to the R4 series.
Q: Is this board compatible with existing Arduino Uno shields?
A: Yes, the Arduino UNO R4 Minima/WiFi maintains the standard Uno form factor and pinout, making it compatible with most existing shields designed for the Uno.
Q: What is the main difference between the Minima and the WiFi version?
A: The primary difference is that the WiFi version includes an integrated ESP32-S3 module for wireless connectivity, while the Minima version does not have built-in WiFi or Bluetooth.
Q: Can I power this board with a 9V battery?
A: Yes, you can power the board via the VIN pin or the barrel jack connector (if using a shield adapter) with a voltage range of 7V to 15V, so a standard 9V battery works perfectly.
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