The Expansion Breakout Board 328P IO Shield acts like a breakout board for Arduino NANO and is specially designed to make easy connections and links between Arduino Nano and many other devices in a very simple and trouble-free manner.
There are several different options for power input and the footprint of this board is the same as the Arduino Duemilanove.In addition, each pinout includes 5V and GND pins for easy connection to sensors or servos.