32MB memory USB-TTL CH340G ATmega328P ESP8266 WiFi UNO R3

The UNO+WiFi R3 ATmega328P + ESP8266 (32Mb Flash) USB-TTL CH340G Development Board is a dual-processor development board combining an Arduino-compatible ATmega328P microcontroller with an ESP8266 Wi-Fi wireless module featuring 32 Mb flash memory. It includes an on-board CH340G USB-to-TTL converter for easy programming via Micro-USB, and a DIP switch to select between programming the ATmega328P, the ESP8266, or both.

 Key Features

• Dual MCUs:
  • ATmega328P – classic Arduino 8-bit MCU (5 V logic).
  • ESP8266 – 32-bit Wi-Fi MCU for wireless connectivity (802.11 b/g/n).

• Flash Memory: 32 Mb on the ESP8266 for larger firmware and data storage.

• USB-to-TTL CH340G: On-board converter simplifies USB connection for power and programming.

• Arduino UNO R3 Compatibility: Standard UNO R3 pin layout allows use with Arduino shields and modules.

• DIP Switch Mode Selection: Choose whether the USB connection goes to the ATmega328P or the ESP8266 for firmware upload or communication.

• Power Input: Via Micro-USB (5 V) or VIN (recommended 6–12 V), with onboard regulator.

• GPIO & Interfaces:
  • ATmega328P: digital I/O, PWM, UART, SPI, I²C, analog inputs.
  • ESP8266: Wi-Fi radio, UART, and additional GPIO.

Typical Uses:
✔ IoT and cloud connectivity – sensor networks sending/receiving data.
✔ Home automation – wireless control of lights, relays, appliances.
✔ Educational prototyping – perfect for Arduino learning and wireless applications.
✔ Web interfaces & APIs – interactive web dashboards via Wi-Fi.

Note: The board uses 5 V logic for the ATmega328P and 3.3 V logic for the ESP8266, so ensure compatible voltage levels for connected peripherals.

MCU：ATmega328

WIFI MCU：ESP8266

USB to serial chip：CH340G

Input Voltage (recommended)：7-12V

Input Voltage (limits)：6-20V

Description:

*Full integration on one board: Uno R3 ATmega 328 and WiFi ESP8266 with memory 32Mb (MegaByte).

*All of the modules can work together or each separately. And everyone has their own pinout headers.

*The convenient solution for the development of new projects requiring Uno and WiFi.

*Via USB you can update sketches and firmvare for ATmega328 and for ESP8266. For this on board have the USB-serial converter CH340G.

*Use this board is very simple.

*The board has DIP-switch, to connect the modules.

*For example, to: USB and ATmega328, USB and ESP8266, ATmega328 and ESP8266.