Full integration on one board: Mega R3 ATmega2560 and WiFi ESP8266 with memory 32Mb. 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 firmware for ATmega2560 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 ATmeg2560, USB and ESP8266, ATmega2560 and ESP8266.
DIP1 2 3 4 5 6 7 ATmega2560<->ESP8266 ON ON OFF OFF OFF OFF OFF USB <->ATmega2560 OFF OFF ON ON OFF OFF OFF USB<->ESP8266 (Update firmware or sketch) OFF OFF OFF OFF ON ON ON USB<->ESP8266 (communication) OFF OFF OFF OFF ON ON OFF All independent OFF OFF OFF OFF OFF OFF OFF
USB <->ATmega328<-> ESP8266
Connection1 2 3 4 5 6 7 USB <-> ATmega2560<-> ESP8266 ON ON ON ON OFF OFF OFF To RXD3/TXD3
USB converter CH340G connect to RX0/TX0 of ATmega2560 ESP8266 connect to RX3/TX3 of ATmega25 Infos link:http://robotdyn.com/~QJpWf – International
1 x Wemos® Mega +WiFi R3 ATmega2560+ESP8266 32Mb Memory