Our IO expansion board is evolving, the RS485 IO Expansion Shield is now supporting Xbee and has colour coded pin header. It combines our popular Xbee shield with IO expansion shield.

It even supports SD module card which provides the ultimate functional expansion for Arduino so far.  As its predecessor, it supports RS485, APC220 Radio Communication Module, Bluetooth , Xbee communication, servo control.

ESP8266 Arduino Programming Tutorial - DFRobot.com

Hardware
DFRduino UNO R3
Xbee USB adapter (FTDI ready)
IO Expansion Shield for Arduino (V6)
USB Cable A-B for Arduino
Mini USB cable

• Support Seperate Servo Power Supply
• Support RS485
• Support Xbee (Xbee pro)
• Support Bluetooth
• Support APC220
• Support SD card read/write
• Support URM04 (RS485 Ultrasonic Sensor)

• Wiki Doc
• Schematics

• RS485 IO Expansion Shield for Arduino     x1