How to Create a Hidden Piston Door in Minecraft

To begin, decide where you want your hidden door. The final aparatus will only take up about a 6 by 12 space. Place three sticky pistons spaced four blocks apart.

Place your desired hidden door material in a two by four pillar between the pistons with a space between the hidden door and pistons.

To fashion the piston activators, place a redstone torch next to the bottom piston on either side. Then place a block above it, activating the second highest piston as seen above.

To finish it up, place a piece of redstone dust on top the block you just placed, activating the final piston. Be sure to do this for both sides.

Dig a two deep trench connecting the redstone torches on each side of your piston set up.

Remove a block underneath the block that your redstone torches sit on. Do this on either side.

Place a redstone torch. You will see that the top redstone torch deactivates.

Dig three blocks out from the torch you just placed and run redstone wire to a third torch.

Connect these third torches with redstone wire as seen above. This will ensure the piston arrays communicate with each other when activated.

Dig a trench two wide from the front of the hidden door to the back connecting to the first trench. Fill the trench with redstone connecting it to the redstone in the front as seen above.

Run the two wide trench two blocks out from behind the door.

Cover up all the redstone in the trenches below your door level with the floor. Now place two pressure plates one block in front of your hidden door. Do this on either side.

Here is the hidden door completey covered.

And here is the hidden door activated.

Your hidden door is now complete, ready for you to customize it however you feel. Here's a hidden door inside a home wherein the door is made from bookcases and the presuure plates are wooden.