The UNO R4 WiFi is the newest flagship board in the Arduino UNO family, blending the simplicity of the original UNO with additional features such as onboard Wi-Fi, 12×8 LED matrix, and a powerful 32-bit microcontroller. The UNO R4 WiFi is aimed at makers, educators, and professionals and is ideal for IoT projects, interactive displays, and advanced prototyping. No matter if you’re creating a smart home device, an internet of things robot, or an educational tool, UNO R4 WiFi provides you with the tools to help you bring your ideas to life.
Benefits and Practical Applications:
- Built-in Wi-Fi: Provides easy connectivity for IoT devices and remote control applications.
- 12×8 LED Matrix: Provides graphical output and creativity for interactive programs.
- Improved Performance: Driven by a 32-bit ARM Cortex-M4 microcontroller to improve processing and complex operations.
- Easy to Use: Fully compatible with the Arduino IDE and UNO shields and accessories you already own.
- Multi-Use: Suitable for IoT, robotics, home automation, educational products, and interactive art installations.
What is New in the UNO R4 WiFi
The UNO R4 WiFi provides major improvements to the UNO R3 and UNO R4 Minima:
- 32-bit Processing Capability – Renesas RA4M1 (48 MHz) in place of 8-bit ATmega328P.
- ESP32-S3 Module – Offers WiFi and Bluetooth for IoT applications.
- More Memory – 32 KB RAM & 256 KB Flash for bigger and more complicated projects.
- Expanded Voltage Range – 5V logic is supported, making it compatible with current shields.
- Additional Analog Inputs – 14-bit ADC for increased accuracy.
- CAN Bus Support – Industrial communication protocols are supported. Qwiic Connector – Attach sensors & peripherals without soldering quickly.
- USB-C Interface – More convenient and faster than micro-USB.
Comparison: UNO R4 WiFi vs. UNO R4 Minima vs. UNO R3
| Feature | UNO R3 (ATmega328P) | UNO R4 Minima (RA4M1) | UNO R4 WiFi (RA4M1 + ESP32) |
|---|---|---|---|
| Processor | 8-bit, 16 MHz | 32-bit, 48 MHz | 32-bit, 48 MHz |
| Wireless Connectivity | ❌ No | ❌ No | ✅ WiFi & Bluetooth (ESP32-S3) |
| RAM | 2 KB | 32 KB | 32 KB + ESP32 RAM |
| Flash Memory | 32 KB | 256 KB | 256 KB + ESP32 Flash |
| Analog Inputs | 6 (10-bit ADC) | 8 (14-bit ADC) | 8 (14-bit ADC) |
| Digital I/O | 14 | 14 | 14 |
| PWM Pins | 6 | 6 | 6 |
| Communication | UART, I2C, SPI | UART, I2C, SPI, CAN | UART, I2C, SPI, CAN, WiFi, Bluetooth |
| Voltage | 5V | 5V | 5V |
Detailed Technical Specifications:
- Microcontroller: RA4M1 (32-bit ARM Cortex-M4)
- Operating Voltage: 5V
- Input Voltage (recommended): 7-12V
- Digital I/O Pins: 14 (6 PWM outputs)
- Analog Input Pins: 6
- DC Current per I/O Pin: 20 mA
- Flash Memory: 256 KB
- SRAM: 32 KB
- EEPROM: 8 KB
- Clock Speed: 48 MHz
- Wi-Fi Connectivity: Built-in ESP32-based Wi-Fi module
- LED Matrix: 12×8 RGB LED matrix for visual feedback
- USB Connection: USB-C
- Compatibility: Arduino IDE, UNO R3 shields, and accessories
FAQ:
1. Does the UNO R4 WiFi support Wi-Fi connectivity?
Yes, the UNO R4 WiFi features a built-in ESP32-based Wi-Fi module for seamless connectivity in IoT projects.
2. Can I use UNO R3 shields with the UNO R4 WiFi?
Yes, the UNO R4 WiFi retains the same pinout as the UNO R3, ensuring compatibility with most shields and accessories.
3. What is the purpose of the 12×8 LED matrix?
The LED matrix provides visual feedback and can be used for animations, notifications, or interactive displays in your projects.
4. How does the UNO R4 WiFi compare to the UNO R4 Minima?
The UNO R4 WiFi includes additional features like built-in Wi-Fi and an LED matrix, making it ideal for connected and interactive projects.
5. What projects can I build with the UNO R4 WiFi?
The UNO R4 WiFi is perfect for IoT devices, smart home systems, robotics, educational tools, and interactive art installations.
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