I would like to make a command block that when he found someone(testfor) in a specific condition (like, survival mode) a redstone signal will appear and activate another command block(the command doesn't matter)

If you can please to post a picture of how this setup (in redstone) should look like I will be pleased.

1 Answer 1


Place a command block with the /testfor @p[whatever] command.
Then, a redstone comparator facing outwards from the command block.
From there, place your redstone or any redstone contraption that needs the input.

Note: If the comparator's signal isn't strong enough (1 block worth of power), place a Redstone Repeater after the comparator and any output should now have 15 strength.

A comparator only outputs a signal power of 1 if the command succeeds. Add a repeater to make that 15.

  • Thanks for the picture @shanodin... I was going to take one right now, but you just saved me the work :)
    – aytimothy
    Commented Oct 14, 2014 at 6:59
  • Actually @WhynoTalos added the picture, I just edited in the alt-text :)
    – shanodin
    Commented Oct 14, 2014 at 7:16
  • 1
    You mean 15 strength, not 16, right? Maximum redstone signal strength is 15. (If you do mean 16, you can always rollback my edit)
    – One 2 Many
    Commented Sep 16, 2020 at 3:47

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .