Arduino
Uno R4 WiFi
Best connected controller for advanced IoT and robotics hobbyists.
The Arduino UNO R4 WiFi redefines the classic UNO with enhanced processing power, expanded memory, and a faster clock speed. It integrates Wi-Fi and Bluetooth connectivity via an ESP32-S3 module, making it ideal for IoT projects. This board maintains UNO R3 shield compatibility while adding advanced features like a 12-bit DAC, CAN BUS support, and an onboard OP AMP. Its robust 24V input tolerance and integrated 12x8 red LED matrix offer versatility for complex applications and visual feedback.
$22.00
More Arduino UNO Options
Owner Satisfaction
4.6
/ 5
Category Rank
407
/ 1541
#407 in Development Boards
Price vs Category Average
-75%
Below average
Form Factor
3
/ UNO (UNO R compatible)
Who it's for
- IoT developers needing integrated wireless connectivity
- Makers requiring extra processing power for complex projects
- Hobbyists with existing collections of 5V shields
Who should skip it
- Budget-conscious students seeking the most affordable entry point
- Beginners intimidated by managing dual-chip firmware updates
- Developers relying on extensive, long-established library support
Performance breakdown
IoT Connectivity
Integrated ESP32-S3 module makes wireless project deployment seamless and highly reliable.
Shield Compatibility
Maintains excellent support for legacy UNO R3 hardware and expansion shields.
Processing Power
Significant performance leap over the R3 handles complex logic with ease.
Peripheral Versatility
Onboard DAC, CAN BUS, and OP AMP cover most advanced prototyping needs.
Visual Feedback
The integrated LED matrix provides instant, creative debugging and status visualization.
Power Robustness
High 24V input tolerance allows for direct integration with industrial-grade actuators.
Key Specs
Form Factor
UNO (UNO R3 compatible)
Operating Voltage
5V
Input Voltage Tolerance
Up to 24V
Onboard Peripherals
12-bit DAC, CAN BUS, OP AMP
Wireless
Wi-Fi and Bluetooth (ESP32-S3)
Display
Integrated 12x8 red LED matrix
Interface
Qwiic connector
Special Feature
HID support
Features
- UNO R3 shield compatibility
- Enhanced processing power and memory
- Built-in Wi-Fi and Bluetooth connectivity
- 24V input tolerance for actuators
- Integrated red LED matrix display
- Qwiic connector for easy I2C
- HID keyboard/mouse emulation
- Runtime error diagnostics
What customers say
The Arduino Uno R4 WiFi is a powerful upgrade, praised for its significant performance boost thanks to the 32-bit microcontroller, ideal for IoT projects. Its integrated Wi-Fi and Bluetooth connectivity is a major convenience, removing the need for external shields. Loyal users appreciate the continued 5V compatibility and familiar form factor, ensuring existing shields work seamlessly. While the new architecture requires a slight adjustment, the enhanced capabilities and modern features like USB-C are seen as a worthwhile evolution. This board represents a premium, future proof enhancement that respects the beloved Uno legacy.
Know before you buy
Yes, the board maintains the same form factor and pinout as the UNO R3, ensuring compatibility with most existing shields. However, keep in mind that the R4 operates at 5V, so verify your shield's voltage requirements before connecting.
The LED matrix is controlled directly through the Arduino IDE using the dedicated Arduino_LED_Matrix library. It allows you to display text, animations, or sensor data without needing an external display module.
Yes, the UNO R4 WiFi supports HID (Human Interface Device) emulation, which allows the board to act as a USB keyboard or mouse when connected to a computer. This makes it a great choice for custom macro pads or automation tools.
The Qwiic connector provides a solderless, plug-and-play method for connecting I2C sensors and peripherals. It significantly simplifies prototyping by allowing you to daisy-chain multiple modules using standard JST cables.
Yes, the board is designed to handle up to 24V via the VIN pin, which is useful for industrial applications or projects involving actuators. However, ensure your power supply is stable and properly regulated to avoid potential damage.
The ESP32-S3 acts as a co-processor that manages both Wi-Fi and Bluetooth connectivity. This offloads the wireless communication tasks from the main processor, allowing your code to run more efficiently while maintaining a stable network connection.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$22