I have to give some credit to sethbling for demonstrating a few useful bud switches and mylifeinmc who demonstrated a normal stone generator.
Minecraft hidden door bud switch.
Finally mumbo jumbo returns with a range of hidden entrances you can make.
To create the door start by digging a hole in a wall.
The painting door is one of the most well known hidden doors in minecraft.
Minecraft how to make a hidden door duration.
Minecraft epic hidden door bud switch tutorial duration.
The detector used is the classic t bud or toggle bud which can be found on the wiki.
Some work with a piston door while others are entirely new contraptions.
When the furnace is smelting it causes a block update which triggers the block update detector.
Next replace the removed blocks with ones that can hold a painting but can also be walked through.
The block update detector or bud switch is a redstone mechanism that uses quirks in the game in order to detect changes in nearby blocks.
It uses a bud switch to set it of then it replaces the block you destroyed and opens the door.
As such players are likely to check for secret passages even if they are not trying to invade or thieve.
This door i am really proud of.