Minecraft 1 Wide Piston Bud Switch Special | Compact Super Bud Switch | Half Tick Machine Gun





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Published on Nov 24, 2011


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The Block Update Detector, or "BUD switch", is a redstone mechanism that exploits bugs and quirks in the game in order to detect changes in nearby blocks. There are many different designs, but they are all based on the same general idea: a redstone circuit is put in a state that should be unstable, but is stable due to some block within not being notified of changes in the circuit that would otherwise affect it. This lazy block then functions as the "sensor". When an adjacent block changes state in some way, it sends a notification to the sensor block and "wakes it up". The circuit then performs some other action and goes back into the sleeping state.

The method was discovered by Cored. It was later popularized by Etho and further developed by many different players.

The BUD switch detects the following events when they happen next to the sensor block:

Placement of blocks
Destruction of blocks
Re-flowing of water or lava
Freezing or melting of ice
Gravel or sand landing from a fall
Movement of blocks by pistons, and the movement of pistons themselves
Growth of plants other than trees, including:
sugar cane
tall grass
pumpkins, melons, and their stems
Leaf growth and decay
Growth and death of grass
Dirt becoming tilled soil, soil becoming moist, soil reverting to dirt (but this can be more easily detected with a repeater)
Fire igniting or burning out
Redstone ore starting to glow, or stopping
Changes in redstone state or power level, and activation of redstone devices
Setting the delay on a repeater
Getting in or out of a bed
A furnace starting to smelt, or finishing
Opening or closing a door, trapdoor, or Fence Gate
Inserting or removing Music Discs from a jukebox
Placing an Eye of Ender in an Ender Portal block
Rails changing orientation
TNT igniting and becoming an entity

There are many BUD switch designs based on pistons. This simple and popular design exploits a bug in which pistons aren't properly notified when powered through the space above them. The piston acts as the sensor.

Here i showcase 4 different piston design, one for each orientation of the piston itself. The floor model buf switch, a ceiling model, and 2 different bud switches where the piston is on its side.

I also show how to convert my favourite bud switch into a clock, and a half tick Pulser.



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