The WiFi R3 ATmega328P + ESP8266 is a 2-in-1 development board that combines the classic Arduino Uno R3 with a built-in ESP8266 WiFi module, providing both wired and wireless connectivity in one compact design. It also includes a CH340G USB-TTL converter, making it easy to program directly through a USB cable — no additional programmer needed.

This board is ideal for IoT projects, automation systems, and wireless sensor networks, offering the simplicity of Arduino with the power of WiFi-enabled microcontrollers. It allows you to use the ATmega328P and ESP8266 either independently or together, depending on your project requirements.

 Specifications:

• Microcontrollers: ATmega328P + ESP8266 (ESP-01 integrated)
• USB Chipset: CH340G (for serial communication and programming)
• Operating Voltage: 5V (regulated via USB or VIN)
• Logic Level: 5V (ATmega328P) / 3.3V (ESP8266)
• Flash Memory (ATmega328P): 32 KB (0.5 KB used by bootloader)
• SRAM (ATmega328P): 2 KB
• EEPROM (ATmega328P): 1 KB
• WiFi Module Flash Memory: 1 MB (ESP8266)
• Clock Speed: 16 MHz (ATmega328P), 80 MHz (ESP8266)
• Digital I/O Pins: 14 (6 PWM outputs)
• Analog Input Pins: 6
• Communication Interfaces: UART, SPI, I2C
• USB Connector: Type-B (standard Arduino style)
• Compatible Software: Arduino IDE, NodeMCU, AT Commands

Key Features:

• Combines Arduino Uno R3 functionality with built-in WiFi (ESP8266)
• CH340G USB driver for reliable PC connection and easy uploading
• Switch between different working modes using onboard DIP switches:

1. 1. UNO mode (ATmega328P only)
   2. ESP8266 mode only
   3. Communication mode (ATmega + ESP8266 via serial)

• Fully compatible with Arduino IDE — just install the ESP8266 board package
• Plug-and-play via USB, ideal for IoT beginners and makers
• Supports both AT command firmware and custom ESP8266 programming

Applications:

• IoT and smart home systems
• Wireless sensor and automation projects
• WiFi-enabled data logging and monitoring
• Prototyping Arduino + WiFi integrated systems
• Educational and STEM projects

Why Choose the WiFi R3:

• Combines two powerful microcontrollers on one board
• Easy to program via standard Arduino IDE
• No need for external WiFi modules or USB adapters
• Great for IoT learning, rapid prototyping, and smart devices