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I want to make a pvp map which has 2 spawnpoints on the map. The spawnpoints are closed off with an iron door. The teams can both get ready by flipping a lever. Now i want to make it so when both teams are ready the doors open. This could be achieved by a memory cell. I know because i have made these before but i cant remember how to build this and i also knew it wouldn't work if i added more doors. Any suggestions?

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up vote 7 down vote accepted

Couldn't you use a AND gate? A memory cell seems overkill for this sort of thing.

An AND gate: enter image description here

1 Lever in "Ready" Position: enter image description here

2 Levers in "Ready" Position (doors open) enter image description here

You could also consider using command blocks to teleport the team/players into the arena when a button is pressed.

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Thanks this would work, pretty simple. The reason i dont want to use command blocks is that some players will always load faster then the other so they might have an advantage. –  Marco Geertsma Apr 9 '13 at 8:48
    
This will also work with more than two doors; just ensure that the signal from one lever can span the whole row, and that the doors are receiving the "on" signal. Use repeaters as necessary; to keep it fair, you should make each door delayed by the same amount. You could even incorporate some sort of timer (starting in 3... 2... 1... GO!) with command blocks and the /say <message> command. –  MathSquared Apr 13 '13 at 1:17
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Maybe I'm misunderstanding the question but it seems you just need an AND gate, with the two levers as inputs and the doors connected to the output, that way, when lever A AND B are turned on the doors will open.

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And do you have any examples on how to make an AND gate? –  Marco Geertsma Apr 9 '13 at 7:53
    
@MarcoGeertsma It's not a hard thing to look up: minecraftwiki.net/wiki/Redstone_Circuits/… –  Ronan Forman Apr 9 '13 at 8:09
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