I`m trying to make a really secret base on a friend's realm but i have no idea how to make an item be thrown and a piston revealing the base. Can someone help?
Minecraft – Does the iron weighted pressure plate work under blocks. If not? How to i get it to work
minecraft-java-editionminecraft-redstone
Related Solutions
There are 3 designs in mind:
and also this
The third design is slowest but it is also the smallest,
If you're willing to put the button on the bottom block, this isn't too hard. Try something like this:
Here's another shot from the top:
And here's one from the back:
When either the button is pressed or someone stands on the pressure plate, the door will open.
If you want the button to be at eye level, you can make a minor modification, as suggested in the comments:
This will allow you to move the button up one block, at the cost of two repeaters. Keep in mind that this will add a (very) small delay to the circuit, but considering it's a button, this might even be an advantage.
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Best Answer
It's somewhat unclear what you're asking.
Like great majority of blocks in the game (rare exceptions being items that manifest as entities: item frames, paintings, armor stands), the pressure plates occupy 1 block space - despite their thin hitbox. And they do work within that 1 block space regardless of whatever block is placed above them - any items/entities placed on them (within limitations; stone plates - only mobs/players; weighted - set number of items) will produce a signal. They do not detect blocks - a block, even a gravity block like sand, placed above them will not be detected (though sand falling from above will break into the item form and the item will be detected).
And obviously they will not detect items on blocks above them - only items on the plate. So if you place the plate under ground, the item on top of the ground won't influence it.
Consider instead using a hopper - it can pull items in through blocks shorter than a full block - e.g. farmland, path block, bottom slab. Reading the hopper content with a comparator will produce a signal, which you then can e.g. send to a T flip-flop circuit to toggle the door (and then retrieve the item from the hopper through an underground passage from within the base).
A hopper minecart can even pull items through a solid block like stone and can also give its items on to a hopper or chest. If it is on a detector rail, a comparator can also detect its contents.