I'm using a sensor shield to get access to the UNO's analog pins and the same 16x2 shield for user feedback and control. Then any 3 pin "bricks" can easily connect. Just remember A0 is the keypad... 
I'm using a sensor shield to get access to the UNO's analog pins and the same 16x2 shield for user feedback and control. Then any 3 pin "bricks" can easily connect. Just remember A0 is the keypad...