The Arduino UNO R4 WiFi is a next-generation development board that combines the Renesas RA4M1 microcontroller with the ESP32-S3 Wi-Fi/Bluetooth® module, delivering significantly more processing power and connectivity than its predecessors. Maintaining the familiar UNO form factor, it ensures compatibility with existing shields while introducing new features such as an onboard 12x8 LED matrix, a Qwiic I2C connector for easy hardware integration, and built-in HID support. With expanded memory and a faster clock speed, this board enables more complex applications and seamless IoT development. Whether you’re building smart devices, experimenting with wireless communication, or exploring creative coding, the UNO R4 WiFi opens endless possibilities for makers, students, and professionals alike. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Dual-core power – Renesas RA4M1 MCU + ESP32-S3 for performance and connectivity.
Wireless freedom – Native Wi-Fi® and Bluetooth® for IoT and remote control projects.
Onboard LED matrix – 12x8 programmable display for animations, indicators, and data visualization.
Qwiic connector – Plug-and-play expansion for sensors and I2C modules without soldering.
HID support – Enables USB keyboard/mouse emulation for interactive projects.
Enhanced memory & clock – Run complex programs faster and more efficiently.
Form factor compatible – Works with existing Arduino UNO R3 shields and accessories.
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Applications:
IoT development – Build connected devices with Wi-Fi and Bluetooth support.
STEM education – Ideal for teaching embedded systems and creative coding.
Robotics projects – Control robots with wireless communication and real-time data.
Prototyping – Quick idea testing using existing Arduino shields and Qwiic modules.
Interactive systems – Create HID-based projects like custom controllers and smart input devices.
Creative displays – Use the onboard LED matrix for patterns, notifications, and visual feedback.
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| General Specifications |
| Main MCU | Renesas RA4M1 (Arm® Cortex®-M4, 48 MHz) |
| Connectivity MCU | Espressif ESP32-S3 |
| Wireless Connectivity | Wi-Fi®, Bluetooth® |
| Onboard Display | 12x8 LED Matrix |
| Connector Type | Qwiic I2C Connector |
| HID Support | Yes (Keyboard/Mouse emulation) |
| Compatibility | Same form factor as Arduino UNO R3 |
| Memory | Expanded Flash & RAM (compared to UNO R3) |
| Clock Speed | Faster than UNO R3 |
| USB Interface | USB-C |
| Shipment Weight | 0.0237 kg |
| Shipment Dimensions | 8 × 9 × 3 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
Tech specs
| Board | Name | Arduino® UNO R4 WiFi |
| SKU | ABX00087 |
| Microcontroller | Renesas RA4M1 (Arm® Cortex®-M4) |
| USB | USB-C® | Programming Port |
| Pins | Digital I/O Pins | 14 |
| Pins | Analog input pins | 6 |
| DAC | 1 |
| PWM pins | 6 |
| Communication | UART | Yes, 1x |
| I2C | Yes, 1x |
| SPI | Yes, 1x |
| CAN | Yes 1 CAN Bus |
| Power | Circuit operating voltage | 5 V (ESP32-S3 is 3.3 V) |
| Input voltage (VIN) | 6-24 V |
| DC Current per I/O Pin | 8 mA |
| Clock speed | Main core | 48 MHz |
| ESP32-S3 | up to 240 MHz |
| Memory | RA4M1 | 256 kB Flash, 32 kB RAM |
| ESP32-S3 | 384 kB ROM, 512 kB SRAM |
| Dimensions | Width | 68.85 mm |
| Length | 53.34 mm
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FAQs
Can I use hardware compatible with the Arduino UNO R3 with the Arduino UNO R4 WiFi?
Yes, the Arduino UNO R4 WiFi was specifically designed to ensure compatibility with previous shields and compatible hardware developed for the Arduino UNO R3. The UNO R4 WiFi maintains the same mechanical and electrical compatibility, allowing you to seamlessly use your existing shields and hardware with the new board. This makes it easy to upgrade to the UNO R4 WiFi without the need for significant changes or adaptations to your projects.
Can I use hardware compatible with the Arduino UNO WiFi Rev2 with the Arduino UNO R4 WiFi?
Yes, the Arduino UNO R4 WiFi is fully compatible with previous shields and hardware developed for the UNO WiFi Rev2. Both boards share the same UNO form factor and 5 V operating voltage. However, it's important to note that depending on the design, there may be changes in the pinout elements. Please refer to the documentation and pinout diagrams for specific details and compatibility considerations.
Can I use my sketch developed for the UNO R3 in the UNO R4?
Yes, if your sketch was developed using the Arduino API. In case you are using instructions only available for the AVR architecture, some changes need to be made to ensure compatibility.
Are all libraries compatible with the UNO R3 also compatible with the UNO R4 WiFi?
No, some UNO R3 libraries use instructions of the AVR architecture that are not compatible with the architecture of the UNO R4 WiFi, however there are libraries that have already been ported as part of our early adopters program or are based on the Arduino API.
What is the on-board LED Matrix on the Arduino UNO R4 WiFi and how can I use it?
The on-board LED Matrix is a fully addressable 12x8 (96 points) red matrix that utilizes Charlieplexing to individually control each point. To get started, simply download the “Arduino UNO R4 boards” core. This will grant you access to the user-friendly Arduino_LED_Matrix API, allowing you to program and control the LED Matrix. More information can be found here.
Are there any tools available to assist with creating animations for the LED Matrix?
Absolutely! We have developed a graphic tool specifically designed to help makers create and export their own animations. This way, you can unleash your creativity and make the most of this exciting feature. Find more information on the Arduino Labs website.
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Package Includes:
1 x Arduino UNO R4 WiFi
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