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I am a beginner at minecraft. I am very confused by the following setup:

If I step on the pressure plate, piston number 1 is activated. The key piece of redstone is the one circled in blue; if I remove that one, the piston stops activating.

As for piston 2, I am also confused why it's not activating. I thought it should be diagonally powered, but it's not.

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    I'm pretty sure that to get piston 2 to activate, you need redstone directly leading to it or the block underneath it, not just running next to it. its been awhile since ive played minecraft and used redstone, so i dont remember offhand why piston 1 is activating.
    – Dragonrage
    Commented Jun 15, 2018 at 22:09
  • Pistons, and how they interact with redstone, are weird. These pistons are most likely weakly powered when the pressure plate is pushed.
    – MBraedley
    Commented Jun 15, 2018 at 22:14

1 Answer 1

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It is being powered via quasi-connectivity. An interesting quirk with redstone which is not a bug. It is an interesting one, I will use pictures to demonstrate your circuit but if you click that link to go to the wiki, it is filled with several different ways quasi-connectivity works.

In your case, you have created a Block Update Detector (BUD) that immediately updates the block via the redstone dust you have circled in blue.

Here is an example of your current circuit.
Image 1

The yellow block powers the piston via quasi-connectivity. At this point the piston would not extend, however, the redstone dust on the purple block immediately updates the piston which causes it to extend. The dust is not powering it, but updating it.

While still powered, removed the redstone dust on purple block: Image 2

The piston remains extended as it is still powered via the yellow block.

Now we cycle the lever off and back on:
Image 3

No extension of the piston because the dust on the purple block is not there to update the piston.

Manually placed an orange block next to the piston:
Image 4

The placing of the orange block next to the piston while the circuit was powered caused the piston to update and extend.

Unfortunately you can not have your pressure plate powering that block.


Piston 2 is not extending because you are powering the block lower then the piston.

Image 5

If you were to raise the level up one, so you are powering the block next to the piston, it will extend.

Image 6

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  • If you swap the piston and stone that has redstone on it in your last picture, i believe it will also power the piston.
    – Dragonrage
    Commented Jun 15, 2018 at 23:25
  • @Dragonrage Yes it will. You can also remove the redstone dust that is on top of the stone and it will still function as the restone dust will be pointing at the stone and weakly powering it.
    – IronAnvil
    Commented Jun 16, 2018 at 1:26

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