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Original Arduino UNO R4 WIFI

Original Arduino UNO R4 WIFI

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  • This is Arduino UNO R4 WIFI
  • Powerful 32-bit microcontroller: The Arduino UNO R4 WiFi is a 32-bit development board, offering enhanced performance compared to its 8-bit AVR predecessors.
  • Integrated Wi-Fi and Bluetooth: It features an inbuilt ESP32-S3 Wi-Fi module, providing seamless connectivity options for IoT applications.
  • Expanded memory and faster clock speed: With 256 kB flash memory and 32 kB SRAM, the UNO R4 WiFi offers ample storage and improved processing speed.
  • Onboard 12x8 LED matrix: This Arduino board includes a programmable LED matrix, allowing for visual customization and creative projects.
  • Extra onboard peripherals: The UNO R4 WiFi comes with additional peripherals like a real-time clock (RTC), digital-to-analog converter (DAC), and more, enhancing its capabilities for various projects

Original Arduino UNO R4 WIFI

Introducing the latest addition to the Arduino lineup, the Arduino UNO R4 WiFi board, which represents a significant leap forward in functionality and capabilities. Building upon the rich heritage of the UNO series, this advanced version incorporates cutting-edge features to empower your projects with remarkable efficiency.

The key highlight of the UNO R4 WiFi lies in the seamless integration of the ESP32-S3 Wi-Fi module (ESP32-S3-MINI-1-N8), bestowing the UNO with built-in Bluetooth and Wi-Fi functionalities. This integration ensures a comprehensive connectivity solution for enhanced versatility and convenience.

As a member of the first UNO series of 32-bit development boards, the UNO R4 WiFi marks a departure from its predecessors, which relied on 8-bit AVR microcontrollers. Leveraging a robust 48 MHz Arm Cortex-M4 microprocessor, this board leverages the prowess of the Renesas RA4M1 series microcontroller (R7FA4M1AB3CFM#AA0). Its expanded memory capabilities are truly impressive, featuring 256 kB flash, 32 kB SRAM, and 8 kB of EEPROM. To facilitate seamless and efficient communication between the RA4M1 and ESP32-S3 modules, a reliable logic level translator (TXB0108DQSR) is employed, ensuring optimal performance at all times.

Upgrade to the Arduino UNO R4 WiFi today and unlock an unparalleled level of innovation within the realm of Arduino, ushering in a new era of limitless possibilities for your projects.

Also, read our blog on the Best Arduino Board explaining the different types of Arduino boards and how to select the right Arduino board for your needs.


  • The UNO R4 is now a 32-bit microcontroller board, previously based on 8-bit AVR.
  • The board features 14 digital I/O ports and 6 analog channels.
  • Dedicated pins for I2C, SPI, and UART connections.
  • Significantly larger memory: 8 times more flash memory (256 kB) and 16 times more SRAM (32 kB).
  • Fastest 48 MHz clock speed, 3x faster than its predecessors.
  • Onboard ESP32-S3 module for Wi-Fi and Bluetooth connectivity.
  • Onboard 12x8 LED matrix, making it one of the most visually unique best Arduino boards to date. The LED matrix is fully programmable, allowing you to load anything from still frames to custom animations.

Also check the Arduino UNO R4 Minima. It is a development board featuring a 32-bit microcontroller with a 48 MHz Arm Cortex-M4 processor, providing enhanced performance compared to its predecessors. The board offers expanded memory with 256 kB flash memory, 32 kB SRAM, and 8 kB data memory (EEPROM). It comes with additional peripherals, including a Capacitive Touch Sensing Unit (CTSU), USB 2.0 Full-Speed Module (USBFS), and more.

Pin Diagram:

Arduino UNO R4 WIFI Pin Diagram

NEW Arduino UNO R4 WiFi | FULL Walkthrough!

Package Includes:

  • 1 x Arduino UNO R4 WIFI



48 MHz Arm Cortex-M4 microprocessor with a floating point unit (FPU)
5 V operating voltage
Real-time Clock (RTC)
Memory Protection Unit (MPU)
Digital-to-analog Converter (DAC)


256 kB Flash Memory
32 kB SRAM
8 kB Data Memory (EEPROM)


Capacitive Touch Sensing Unit (CTSU)
USB 2.0 Full-Speed Module (USBFS)
14-bit ADC
Up to 12-bit DAC
Operational Amplifier (OPAMP)


Operating voltage for RA4M1 is 5 V
Recommended input voltage (VIN) is 6-24 V
Barrel jack connected to VIN pin (6-24 V)
Power via USB-C at 5 V


1x UART (pin D0, D1)
1x SPI (pin D10-D13, ICSP header)
1x I2C (pin A4, A5, SDA, SCL)
1x CAN (pin D4, D5, external transceiver is required)


Wi-Fi support with 802.11 b/g/n standard (Wi-Fi® 4)
Bit rate at up to 150 Mbps
2.4 GHz band


Bluetooth 5

Shipment Weight

0.03 kg

Shipment Dimensions

10 × 8 × 4 cm

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1. Does Arduino Uno R4 have Wi-Fi?

Yes, the Arduino Uno R4 features built-in Wi-Fi thanks to the integration of the ESP32-S3 Wi-Fi module.


2. Does Arduino Uno R4 have Bluetooth?

Yes, the Arduino Uno R4 also comes with built-in Bluetooth, facilitated by the same ESP32-S3 module.


3. What is the main difference between Arduino Uno R3 and R4?

The Arduino Uno R4 is better than the Uno R3 because it has improved parts. It comes with a Renesas RA4M1 48MHz Arm Cortex M4 processor, which gives you 32KB of RAM and 256KB of storage space. It also has a USB-C port and can handle up to 24 volts. Plus, it supports CAN, as well as the usual I2C, SPI, and UART interfaces, making it great for more complicated projects.


4. What are the new features of Arduino Uno R4?

The Arduino Uno R4 comes with some exciting new features:

  • It has a 32-bit microcontroller board.
  • It has bigger memory, 256 kB of flash memory and 32 kB of SRAM.
  • It runs faster with a clock speed of 48 MHz, which is three times faster than older versions.
  • It has integrated Wi-Fi and Bluetooth connectivity through the ESP32-S3 module.
  • It comes with an onboard 12x8 LED matrix for visual feedback and customization.


5. What is the speed of Arduino Uno R4?

The Arduino Uno R4 runs at a speed of 48 MHz, which is three times faster than older versions. This makes it perform better and respond quicker overall.