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I'm trying to make a variation on the sticky-piston hidden door, in which two sticky pistons are activated by a pressure plate in a corridor to reveal either a hidden room, or a treasure chest, or trap, or anything else.
Stepping on the pressure plate would turn off the circuit so that one sticky piston pulls a block up into the ceiling, and the other pulls a block down into the floor. The resultant opening is one block wide by two blocks high.
The problem is I don't know how to wire the redstone vertically. A basic sticky-piston door is easy, as long as the blocks slide left or right but are harder to hide, which is why I want up-down activation. I just can't figure out the signal transmission.
I got half of it working - the down part - after I first posted this. It's getting the current to run up that is giving me trouble. I tried mirror-inverting my system for down to up and it didn't working
I have shredded Google trying to find a tutorial for vertical piston doors, but have failed to find anything. Can somebody give me a step-by-step or the link to a video tutorial in which this has already been done?