Description The Original Arduino UNO EK (एक) R4 WiFi is the latest official Arduino board equipped with a powerful 32-bit Renesas RA4M1 microcontroller, built-in ESP32-S3 WiFi/Bluetooth module, Qwiic/QT connector, and enhanced 5V compatibility. Designed for students, makers, IoT developers, and professionals, the UNO R4 WiFi combines the classic UNO form factor with modern performance—making it one of the most versatile and future-proof Arduino boards ever released. With increased flash/RAM, built-in wireless connectivity, HID support, CAN bus, and extensive library compatibility, the UNO R4 WiFi enables advanced IoT, automation, robotics, and sensor-driven applications with ease. People also search for: Arduino Uno R4, Uno R4 WiFi, Arduino WiFi board, Arduino EK, ESP32 WiFi Arduino, original Arduino India. Specifications Microcontroller: Renesas RA4M1 (ARM Cortex-M4, 48MHz) Wireless Module: ESP32-S3 (WiFi + Bluetooth LE) Operating Voltage: 5V Flash Memory: 256 KB SRAM: 32 KB Connectivity: WiFi, Bluetooth LE, USB-C GPIO: 14 Digital I/O pins, 6 PWM, 6 Analog Inputs Communication: UART, I2C, SPI, CAN Bus Special Features: HID device support, QWIIC/QT connector, built-in diagnostics LED matrix Board Compatibility: Classic UNO shield footprint Applications IoT and WiFi-based automation projects Robotics, sensor systems & prototyping Home automation & smart gadgets STEM education and embedded training Wireless data logging & remote monitoring Usage Notes Use Arduino IDE 2.0+ for full support of UNO R4 family. Ensure ESP32-S3 wireless core is configured for WiFi/Bluetooth features. Fully compatible with most UNO R3 shields (5V support retained). USB-C cable required for programming and power. Frequently Asked Questions (FAQ) Q: Is the UNO R4 compatible with my old UNO R3 shields? A: Yes! A major advantage of the UNO R4 is that it maintains the classic 5V operating voltage and the exact same physical pinout footprint. This means it is backward compatible with the vast majority of existing hardware shields designed for the older UNO R3. Q: What is the red grid on the top of the board? A: That is a built-in 12x8 (96 total) red LED matrix! You can program it easily using the Arduino IDE to display scrolling text, sensor data readings, or simple animations without needing to wire up any external screens. Q: Can I use this board to build a custom keyboard or game controller? A: Yes. Because the Renesas RA4M1 chip has native USB support, the UNO R4 can act as a Human Interface Device (HID). You can program it to emulate a keyboard or mouse when plugged into your PC via the USB-C port. Q: Do I code the ESP32 or the Renesas chip? A: You primarily write code for the Renesas RA4M1 microcontroller, which handles your main program and logic. The ESP32-S3 acts as a dedicated co-processor specifically handling the heavy lifting for Wi-Fi and Bluetooth connectivity, making your main code run much smoother. Package Includes 1 × Original Arduino UNO EK (एक) R4 WiFi Board