Arduino UNO R4 WiFi | ABX00087
The Arduino UNO R4 WiFi combines the processing power and exciting new peripherals of the RA4M1 microcontroller from Renesas with the wireless connectivity power of the ESP32-S3 from Espressif. On top of this, the UNO R4 WiFi offers an on-board 12x8 LED matrix, Qwiic connector, VRTC, and OFF pin, covering all potential needs makers will have for their next project.
With the UNO R4 WiFi, you can easily upgrade your project and add wireless connectivity to expand the reach of your current setup. If this is your first project, this board has everything you need to spark your creativity.
Let's explore what the UNO R4 WiFi has to offer:
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Hardware compatibility with UNO form factor – Same layout, pinout, and 5 V logic as UNO R3 for seamless shield use.
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Expanded memory and faster clock – More memory and speed for complex projects and precise calculations.
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Extra on-board peripherals – Adds a 12-bit DAC, CAN bus, and op-amp for design flexibility.
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Extended 24 V tolerance – Supports wider input range for motors, LED strips, and actuators.
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HID support – Functions as a USB keyboard or mouse to send inputs directly to a computer.
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Wi-Fi® and Bluetooth® – ESP32-S3 module enables wireless connectivity and remote IoT control.
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Qwiic connector – Built-in I²C port connects easily to Qwiic devices and adapters for other sensors.
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Battery-powered RTC support – “OFF” pin powers down the board; “VRTC” keeps the clock running.
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LED matrix – 12×8 red LED matrix for animations or data display without extra hardware.
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Runtime diagnostics – Error-catching mechanism detects crashes and highlights the faulty code line.
With all these features packed into the well-known UNO form factor, now is the perfect time to upgrade your project or embark on your maker journey. The UNO R4 WiFi offers unparalleled versatility and possibilities for makers of all levels.
Specifications
| 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 | |
Documentation
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.