Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Development, Learning, Evaluation & Industrial Control Boards |
| Origin | - |
| Microcontroller | Renesas RA4M1 (ARM Cortex-M4) |
| Operating Voltage | 5V |
| Input Voltage (Recommended) | 7-12V |
| 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) |
| Dimensions | 68.6 x 53.4 mm |
Anonymous
Mar 31, 2026
Rating: 4/5
Great board, WiFi setup takes patience
The Minima version is solid, but I bought the WiFi version expecting instant connectivity. While the hardware is excellent, getting the WiFi libraries configured took some troubleshooting. Once working, it's very stable for IoT projects.
Anonymous
Mar 24, 2026
Rating: 5/5
Smooth transition for legacy code
I was worried my old sketches wouldn't compile, but the Arduino IDE handled the migration seamlessly. The 48MHz clock speed makes real-time data logging much smoother. No lag whatsoever.
Anonymous
Mar 21, 2026
Rating: 5/5
Perfect for university labs
We ordered twenty of these for our introductory robotics course. The USB-C port is a welcome change, and the backward compatibility with most shields means we didn't have to replace our existing inventory. Students love the increased processing power.
Anonymous
Mar 16, 2026
Rating: 5/5
Huge upgrade from the classic UNO
The switch to the ARM Cortex-M4 processor makes this board significantly faster than the old ATmega328P models. The extra memory allows for much more complex projects without running out of space. Highly recommended for anyone looking to step up their embedded game.
Anonymous
Mar 10, 2026
Rating: 5/5
Best value for WiFi projects
Compared to buying a separate ESP module and an UNO, this all-in-one solution saves so much breadboard space. The built-in WiFi is robust and the power management seems improved over previous generations.
Anonymous
Mar 03, 2026
Rating: 4/5
Powerful but documentation could be better
This is my first ARM-based Arduino. It's incredibly fast, but some of the advanced peripheral features aren't as well documented as the older boards yet. Still, for standard GPIO and PWM tasks, it works flawlessly.
Q: Does this support 3.3V logic levels?
A: The board operates at 5V logic levels like the classic UNO. While it has a 3.3V output pin for powering sensors, the I/O pins are 5V tolerant but not native 3.3V logic. Use a level shifter for strict 3.3V devices.
Q: Is this board compatible with existing Arduino UNO shields?
A: Yes, the UNO R4 maintains the same form factor and pinout as previous UNO boards, making it compatible with most standard shields. However, always check voltage requirements for specific sensors.
Q: What is the difference between the Minima and WiFi versions?
A: The hardware core is identical. The WiFi version includes an integrated ESP32-S3 module for wireless connectivity, while the Minima version does not have built-in wireless capabilities.
Q: Which IDE version do I need to program the R4?
A: You need Arduino IDE 2.0 or later, or the web editor, with the appropriate 'Arduino Renesas Boards' package installed via the Board Manager.
Q: Can I power this board via the USB-C port?
A: Absolutely. The UNO R4 series uses USB-C for both programming and power supply. It can also be powered via the barrel jack or the VIN pin.
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