So I'm pretty new to testfor still and I would like to know how to create a commandblock system that would detect when they are standing on a yellow wool block on the coordinates 400 4 600 (for example) does anyone know how to setup this redstone suystem, and also be specific about how I set the redstone system up, so for example show me a picture on how the setup of it would look like.
Minecraft – How to testfor if a player is standing on a certain block on a certain coordinates
minecraft-commandsminecraft-java-edition
Related Solutions
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.
This answer was written prior to the release of 1.13 and "The Flattening" that came with it. An updated answer can be found here.
You're actually pretty close, and definitely on the right track. Instead of {Inventory:[{id:<block ID>,data:<data value>}]}, use {Inventory:[{id:<block ID>,Damage:<data value>s}]}. The s after the data value is important since it's stored as a short, not as an int. (As an aside, if it were stored as a byte, you would append a b instead.)
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Best Answer
You'll need a redstone clock with a command block as shown below:
In the command block add the command
/testfor @a[x=400,y=4,z=Z,r=600]and start up your clock. When ever a user is at that location, the red output line as shown in the picture will power. Once they have left the position, the output will power off.