In this instructable i will show you how to make a door open using signs like redstone but in minecraft pe
Step 1: Building
Find a flat place. Then place a block and put the door next to it. Close the door and mine the block
Step 2: Continue Building
Add blocks all over the door and expand it by 5 blocks on each side
Step 3: Digging
Now this is tricky, you now have two sides: one side with no door and the other side with door. Start with the side that don't have a door. Dig 3 blocks and dig 6 blocks straight until you reach the door. At the door dig 3 blocks and dig two blocks until you reach the first dig.
Step 4: Sand
Dig 2 blocks in left and right sides and put a cactus
Step 5: Signs
Place signs like at the pictures...
Step 6: Another Sand
Now place 5 blocks of sand at the sign you putted next to the door. Put sand at the side that don't have a door. You will see the door has opened. If you have any question go to http://m.youtube.com/results?q=minecraft%20pe%20redstone&oq=minecraft%20pe&gs_l=youtube-reduced.1.0.41l3j0.553.3326.0.5062.12.11.0.0.0.0.586.2489.3j3j3j0j1j1.11.0....0...1ac.1.23.youtube-reduced..7.5.636.7jG8IGJ64H8#/watch?v=NS3GPVr2uPA