Full integration on one board with R3 ATmega2560 and wifi ESP8266 with 32Mb memory. All modules can work together or can work separately as well, and has their own pinout headers. You can update sketches and firmware via USB for Atmega2560 and ESP8266. Use this board is very simple, and have the USB-serial converter CH340G. The board has DIP-switch to connect the modules. For example, to: USB and ATmeg2560, USB and ESP8266, ATmega2560 and ESP8266. Application: Computer USB ESP8266 USB converter CH340G connect to RX0/TX0 of ATmega2560 ESP8266 connect to RX3/TX3 of ATmega25 Colour:As Shown Material:Plastic Package Contents: 1 * Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.