Download Recipe Minecraft Observer Background. When mined without a pickaxe, it drops nothing. It is used to detect changes in in the third row, there should be 3 cobblestones.

Redstone Observer
Redstone Observer from i.stack.imgur.com
The minecraft crafting guide shows how to craft an observer from 6 × cobblestone, 2 × redstone and 1 × nether quartz. We're a community of creatives sharing everything minecraft! Pocket edition , and was added as part of the 0.15.0 update, but it is currently available in minecraft:

Observers output a redstone signal when the block they are observing changes.

Start date jul 31, 2019. Pressure plates make noise where as the observer doesn't and that could enable the making of better traps. Even if you don't post your own creations, we. It observes the block that it is placed against.