Mega Shield is a extension board for Arduino Mega and Google ADK. We have standardized all the connectors into 4 pins（Signal 1、Singal 2、VCC and GND）2mm connectors and keep some of the 3pin（Signal、VCC and GND）2.54mm headers for Servo and Electronic Bricks、which simplify the wiring of electronics projects. The 4pins buckled connectors also make the wiring situation more stable. The Mega Shield includes Digital 0 - 21 and Anolog 0 - 15; We abandon Digital 22 - 53 for easily installing Mega Shield with Xduino Mega/Google ADK.
