Minecraft Block Update Detector

Minecraft Block Update Detector. Then place another block and a block behind it and put there a piston on. An observer can detect daylight sensor's block update.

Minecraft Small Block Update Detector (BUD) 4x1x2
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A comparator update detector or cud switch is a redstone mechanism that exploits a feature in the game in order to detect comparator updates. Basically, chests with a solid block on top can't be opened. The block update detector is a block added by extra utilities.

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