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The Uno + WiFi R3 Development Board is a fully integrated solution that combines an ATmega328P (Arduino UNO R3) and a NodeMCU ESP8266 Wi-Fi module with 4 MB flash memory on a single board.

Both microcontrollers can work together or independently, and each has its own dedicated pin headers for connecting sensors, modules, and peripherals. This makes the board highly flexible for IoT and Wi-Fi-based projects.

The board features an onboard CH340G USB-to-TTL converter, allowing firmware and sketch uploads to both the ATmega328P and ESP8266 via USB. A built-in DIP switch is provided to easily select different communication and programming modes between the microcontrollers and USB interface.

This board is a modernized version of the classic Arduino UNO R3, offering seamless Wi-Fi integration for advanced development and prototyping applications. DIP Switch Configuration ATmega328 ↔ ESP8266 Communication: ON, ON, OFF, OFF, OFF, OFF, OFF USB ↔ ATmega328: OFF, OFF, ON, ON, OFF, OFF, OFF USB ↔ ESP8266 (Firmware / Sketch Upload): OFF, OFF, OFF, OFF, ON, ON, ON USB ↔ ESP8266 (Communication Mode): OFF, OFF, OFF, OFF, ON, ON, OFF All Modules Independent: OFF, OFF, OFF, OFF, OFF, OFF, OFF Features Full integration of ATmega328P and ESP8266 Wi-Fi module on one board Onboard USB-TTL serial converter (CH340G) Supports independent or combined operation of both microcontrollers Built-in DIP switch for easy mode selection USB powered (5V, up to 500 mA) Logic level: 5V 14 Digital I/O pins and 6 Analog input pins Supports Wi-Fi 802.11 b/g/n (2.4 GHz) Wide operating temperature range Features: Compact and lightweight design Built-in WiFi capability Easy USB programming support Compatible with Arduino ecosystem Suitable for IoT applications Breadboard-friendly form factor Fast prototyping and development Supports multiple communication protocols