Mega IO Expansion Shield V2.3 (SKU:DFR0165)

From DFRobot Electronic Product Wiki and Tutorial: Arduino and Robot


This is version 2.3 of the Mega IO Expansion shield. This shield is extra large and includes 3 Xbee slots, 1 microSD slot, Arduino shield headers to plugin most Arduino shields. It also includes a prototyping area and breakouts for Digital pins 14 to 53, Analog pins 6 to 15 and PWM pins 2 to 9. This shield can be a major communications hub for your projects.


  • support most of the arduino shield
  • compatible with the Arduino Mega boards/DFRobot ADK/Arduino ADK
  • Extended TTL connection pins for four Serial ports
  • DIP prototyping area makes it easy to add more chips or electronic components
  • 3 Xbee slots (check the PIN numbers on the board to know the orientation of the Xbee module)
  • 1 microSD slot
  • power selector to select between Arduino Mega power or external power
  • Size:125 x 57 mm


Mega PinOutDiag en.png
Instruction for Digital Pins of the Shield
Pin Function Application
D50 MISO SPI Interface
D51 MOSI SPI Interface
D52 SCK SPI Interface
D53 SS SPI Interface
D1 TX0 Serial 0
D0 RX0 Serial 0
D18 TX1 Serial 1
D19 RX1 Serial 1
D16 TX2 Serial 2
D17 RX2 Serial 2
D14 TX3 Serial 3
D15 RX3 Serial 3
D20 SDA IIC Interface
D21 SCL IIC Interface
D4 PG5_SS D4 is used when use MicroSD
D13 LED digital pin

Trouble shooting

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Category: DFRobot > Arduino > Arduino Shields