EASY 3x3 Piston Door for Minecraft Bedrock 1.21!

In this video, I show you how to build a 3 by 3 piston door in Minecraft Bedrock edition for versions 1.21 and higher. Just to let you know, throughout this video I say "pistons" where I meant to say "sticky pistons". All the pistons for the layout of the door are sticky pistons, while there is only one regular piston in the redstone wiring. I point out which piston this is in the video.
Materials for main door:
15 redstone dust
2 redstone torches
5 repeaters
1 piston
10 sticky pistons
8 observers
1 target block
2 hoppers
4 glass blocks
7 solid blocks
12 door blocks
1 lever (optional)
Materials for Input:
Around a stack of redstone dust
1 comparator
1 block of redstone
1 sticky piston
1 copper bulb
Around a stack of solid blocks
2 or more buttons
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