The Arduino Mega has LOTS of I/O. This Mega Protoshield by Adafruit breaks it all out for easy access and prototyping.
Sometimes you don't need more power - you need more lines of I/O! That's one of the great benefits of the Mega until you try to make use of them. It's not simple to keep over 55 lines of data organized, and that's where the Adafruit mega Protoshield comes in handy.
Using the same Mega footprint, this prototyping shield offers full access to the Mega's hardware with double-long pin/socket sets so you can stack on additional shields.
Mega Protoshield Kit is complete with: