Compact Piston Door

A door activated by pressure plates. Can be constructed as a 2x2 door as pictured or build one side only for a 1x2 door if you prefer. Single door is a great one to hide in corners with an intersecting wall.

Single door requires:
2x sticky pistons
2x wool or other blocks
2x pressure plates
11x redstone
1x redstone torch

Youtube Tutorial

Minecraft 1.5.1