- Stock: In Stock
- Model: ARDUINO-UNOR4WIFI
Arduino UNO R4 WiFi – 32-Bit Development Board with WiFi, Bluetooth and LED Matrix
Arm Cortex-M4, ESP32-S3, WiFi, Bluetooth, USB-C, 12×8 LED matrix, Qwiic, DAC, RTC and CAN – all in the classic Arduino UNO form factor.
Arduino UNO R4 WiFi combines the powerful 32-bit Renesas RA4M1 microcontroller with an Arm Cortex-M4 core and an additional ESP32-S3 for WiFi and Bluetooth connectivity.
The board retains the familiar Arduino UNO form factor and 5 V logic, while adding significantly more processing power, more memory, wireless connectivity and a wide range of modern features.
In addition to the standard GPIO headers, you also get a 12×8 LED matrix, Qwiic connector, USB-C, 12-bit DAC, RTC and CAN support, making UNO R4 WiFi an excellent platform for IoT, automation, robotics, smart-home and many other projects.
Why Choose Arduino UNO R4 WiFi?
- 32-bit Arm Cortex-M4 processor – significantly more processing power than traditional 8-bit UNO boards.
- WiFi connectivity – connect your project to a local network, the internet or Arduino Cloud.
- Bluetooth Low Energy – wireless communication with smartphones, sensors and other BLE devices.
- Built-in 12×8 LED matrix – 96 programmable red LEDs for displaying symbols, animations and data.
- Qwiic connector – quick connection of compatible I²C sensors and modules without soldering.
- USB-C connector – modern connection for programming, power and serial communication.
- DAC, RTC, CAN and HID – many advanced functions available directly on the board.
- 5 V logic and UNO form factor – easier migration from many existing UNO projects.
Renesas RA4M1 + ESP32-S3 – Two Chips, More Possibilities
The main microcontroller is the Renesas RA4M1 with a 32-bit Arm Cortex-M4 core, FPU and a clock speed of 48 MHz.
It handles the Arduino program, GPIO pins, analogue functions, DAC, RTC, CAN and other peripherals.
Wireless connectivity is provided by the ESP32-S3-MINI-1, which supports WiFi and Bluetooth LE. The ESP32-S3 can operate as a communication processor, and direct access to it is also available through a dedicated connector.
This architecture combines the simplicity of the Arduino environment with the capabilities of a modern wireless platform.
WiFi and Bluetooth for IoT Projects
The integrated ESP32-S3 provides WiFi 4 (IEEE 802.11 b/g/n) and Bluetooth 5 Low Energy.
Arduino UNO R4 WiFi can therefore connect to a network and be used to build devices that send data, receive commands or communicate with other connected devices.
- remote sensor monitoring,
- network control of relays and devices,
- IoT measurement stations,
- smart-home projects,
- Bluetooth controllers,
- Arduino Cloud connectivity,
- web interfaces and API communication.
Built-In 12×8 LED Matrix – 96 LEDs without an Additional Module
One of the most visible differences compared with UNO R4 Minima is the built-in 12×8 red LED matrix.
The 96 programmable LEDs can be used for:
- displaying symbols and icons,
- animations,
- visualising sensor data,
- device status indication,
- simple games,
- educational projects and experimentation.
An Arduino library is available for controlling the matrix, so displays and animations can be created directly from your program.
Qwiic – Connect Sensors without Soldering
UNO R4 WiFi includes a Qwiic-compatible I²C connector, allowing fast connection of compatible sensors and modules.
This is particularly useful during prototyping because many modules can be connected without a soldering iron or individual jumper wires.
Important: the Qwiic connector uses 3.3 V logic. Always check the electrical compatibility of the connected module.
Classic UNO Pin Layout and 5 V Logic Levels
UNO R4 WiFi retains the familiar Arduino UNO pin layout, making it suitable for upgrading many existing projects.
- 14 digital I/O pins,
- 6 analogue inputs,
- 6 PWM outputs,
- UART,
- SPI,
- I²C,
- CAN,
- 5 V logic levels on the main RA4M1 microcontroller.
Thanks to the classic UNO form factor, many existing Arduino shields and expansion modules can still be used.
Advanced Analogue Functions
The Renesas RA4M1 introduces features that were not directly available on the classic UNO R3.
- Higher-resolution ADC for more precise analogue measurements.
- 12-bit DAC on A0 for generating a true analogue output signal.
- Integrated OP AMP further expands the possibilities for analogue signal processing.
- Capacitive touch sensing enables additional sensors and user-interface projects.
RTC with Time-Keeping Support
UNO R4 WiFi includes an integrated RTC – Real-Time Clock, useful for data logging, timers, automation and other time-dependent applications.
The board also includes a VRTC pin that can be used to maintain RTC operation even when the main board is not normally powered.
USB-C and HID Support
The USB-C connector is used for programming, power and serial communication.
UNO R4 WiFi also supports USB HID, allowing it to operate as a keyboard or mouse in suitable projects.
This is useful for building custom controllers, macro keyboards, control panels, simulator interfaces and other USB input devices.
CAN Bus for Communication between Devices
The RA4M1 microcontroller also includes support for CAN communication, commonly used in automation, vehicles and various control systems.
Note: the board includes a CAN controller, but an additional external CAN transceiver is required for physical connection to a CAN bus.
Ready for Arduino Cloud
Integrated WiFi connectivity allows the use of the Arduino Cloud platform for connected IoT projects.
Depending on your project design, you can monitor sensor data, build dashboards and control the device over an internet connection.
Power via USB-C or 6–24 V VIN
UNO R4 WiFi can be powered through the USB-C connector at 5 V or through the VIN / DC power input.
The supported VIN input range is 6–24 V, offering more flexibility when integrating the board into different projects and systems.
Important: use a 5 V supply through the USB-C connector. Higher voltages are intended for the VIN or DC power input.
UNO Form Factor Makes Migration from Older Projects Easier
The board retains the standard Arduino UNO form factor, a familiar pin layout and 5 V logic, allowing many existing UNO shields and accessories to be used.
Important: UNO R4 uses an Arm architecture instead of the AVR architecture found in older UNO boards. Libraries or software that directly depend on AVR-specific functions may require an updated version compatible with UNO R4.
What Projects Is Arduino UNO R4 WiFi Suitable For?
- IoT projects – measurements, remote monitoring and internet communication.
- Smart home – sensors, relays, lighting and automation.
- Robotics – sensors, motors, communication and user interfaces.
- Education – programming, electronics and wireless technologies.
- Sensor stations – collecting, displaying and transmitting measurements.
- USB controllers – HID keyboards, controllers and control panels.
- Automation – controlling devices, relays, actuators and other systems.
- Prototyping – rapid development of connected electronic devices.
Arduino UNO R4 WiFi Technical Specifications
- Model: Arduino UNO R4 WiFi
- Arduino SKU: ABX00087
- Main microcontroller: Renesas RA4M1
- Core: 32-bit Arm Cortex-M4 with FPU
- Main processor clock speed: 48 MHz
- Wireless module: ESP32-S3-MINI-1
- ESP32-S3: up to 240 MHz
- WiFi: WiFi 4, IEEE 802.11 b/g/n
- Bluetooth: Bluetooth 5 Low Energy
- RA4M1 Flash: 256 kB
- RA4M1 SRAM: 32 kB
- EEPROM: 8 kB
- Digital I/O: 14
- Analogue inputs: 6
- PWM: 6 outputs
- DAC: 1 × 12-bit on A0
- LED matrix: 12 × 8, 96 red LEDs
- Qwiic: I²C, 3.3 V
- UART: yes
- SPI: yes
- I²C: yes
- CAN: yes, external transceiver required
- RTC: yes
- USB: USB-C
- USB HID: supported
- RA4M1 operating voltage: 5 V
- ESP32-S3 logic: 3.3 V
- VIN: 6–24 V
- Current per I/O pin: up to 8 mA
- Dimensions: approximately 68.85 × 53.34 mm
Important: the microcontroller output pins are not designed to directly power motors, relays or other higher-current loads. Use a suitable transistor, driver or relay module for such devices.
Arduino UNO R4 WiFi at a Glance
- 32-bit Renesas RA4M1 Arm Cortex-M4 at 48 MHz
- ESP32-S3 with WiFi and Bluetooth LE
- 256 kB Flash + 32 kB SRAM
- 12×8 matrix with 96 programmable LEDs
- USB-C + Qwiic
- 5 V UNO GPIO format
- 12-bit DAC + RTC + CAN
- Arduino Cloud compatibility
- Power via USB-C or 6–24 V VIN
- Ideal for IoT, automation and connected projects
Arduino UNO with WiFi, Bluetooth and Much More Performance
Arduino UNO R4 WiFi combines the familiar simplicity of Arduino UNO with a 32-bit Arm processor, ESP32-S3 wireless connectivity, USB-C, an LED matrix and modern peripheral functions.
It is suitable for beginners, education and prototyping, while also offering the capabilities required for more advanced IoT, automation, sensor and network-connected projects.
Choose Arduino UNO R4 WiFi as a modern, connected and flexible foundation for your next electronics project.
| Safety & Compliance | |
| EA_SAFETY_WARNINGS | SAFETY INSTRUCTIONS- Read the instructions before use and use the product only for its intended purpose. - Keep the product away from children. Packaging and small parts may present a hazard. - Do not use the product if it is damaged. - Do not open, disassemble, modify or repair the product yourself. Repairs should only be carried out by qualified personnel. - Protect the product from moisture, water, extreme temperatures, impacts, vibration, flammable gases, vapours and solvents. - After moving the product from a cold to a warm environment, allow it to reach room temperature and let any condensation evaporate before use. - Do not overload the product. Observe the specified voltage, current and power ratings. - If batteries are used, use only the specified batteries and a suitable charger. Never recharge non-rechargeable batteries. - Do not use damaged, leaking or deformed batteries. - For mains-powered products, check that the local mains voltage matches the product rating before connection. - Do not use damaged power cables, plugs or connectors. - Electrical connections requiring professional installation must only be carried out by a qualified electrician with the power disconnected. - When using an external power supply, check the correct voltage, polarity and connector dimensions. - Indoor products must not be used in wet conditions or handled with wet hands. - Disconnect the product from the power supply before cleaning or maintenance. - Dispose of electrical equipment and batteries according to local regulations and not with normal household waste. |
| EA_MANUFACTURER_MODEL | ABX00087 |
| EA_MANUFACTURER | Arduino S.r.l. Via Agostino da Montefeltro 2 10134 Torino Italy Email: DSA@arduino.cc |
| EA_EU_OPERATOR | Arduino S.r.l. Via Agostino da Montefeltro 2 10134 Torino Italy Email: DSA@arduino.cc |
