SOOOO I definitely know that this is a topic that has been around for forever, but since most of the tutorials on YouTube detail huge versions meant for Minecraft long ago, I decided to make a video showing the smallest possible 2x2 piston door. Features:
NO underground wiring
very light on resources
EDIT: the repeater adjacent to the lower piston can be anything that changes when it receives a redstone signal (i.e trapdoor, fence gate, etc)
You only need to use one repeater per side at the top.
I'll explain what I did.
The one set to one is for speed, so it activates faster. The reason I set the other to 4 instead of 3 is because that's the way it works on my server. If other people wanted to use it on other servers I figured I would post it in a way that would work on servers, to avoid complaints.
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