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Detect an Empty Hopper in MC 1.12.2


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I'd like to use a command block to detect when the first slot of a hopper has no items in it in 1.12.2 (Or alternatively, if no slots have items in them). I already know how to search for a specific item in the first slot:




/testforblock ~a ~b ~c hopper -1 {Items:[{id:"minecraft:dirt",Count:1b,Slot:0b}]}




I've tried to search for minecraft:air as a way to detect nothing, but this doesn't seem to work. Any help is appreciated! It must be a command block solution (I know that you can detect an empty hopper "manually" by having a comparator output with redstone torch, but in my scenario the hopper and signal destination (command block location) are very far apart)










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    1















    I'd like to use a command block to detect when the first slot of a hopper has no items in it in 1.12.2 (Or alternatively, if no slots have items in them). I already know how to search for a specific item in the first slot:




    /testforblock ~a ~b ~c hopper -1 {Items:[{id:"minecraft:dirt",Count:1b,Slot:0b}]}




    I've tried to search for minecraft:air as a way to detect nothing, but this doesn't seem to work. Any help is appreciated! It must be a command block solution (I know that you can detect an empty hopper "manually" by having a comparator output with redstone torch, but in my scenario the hopper and signal destination (command block location) are very far apart)










    share|improve this question

























      1












      1








      1








      I'd like to use a command block to detect when the first slot of a hopper has no items in it in 1.12.2 (Or alternatively, if no slots have items in them). I already know how to search for a specific item in the first slot:




      /testforblock ~a ~b ~c hopper -1 {Items:[{id:"minecraft:dirt",Count:1b,Slot:0b}]}




      I've tried to search for minecraft:air as a way to detect nothing, but this doesn't seem to work. Any help is appreciated! It must be a command block solution (I know that you can detect an empty hopper "manually" by having a comparator output with redstone torch, but in my scenario the hopper and signal destination (command block location) are very far apart)










      share|improve this question














      I'd like to use a command block to detect when the first slot of a hopper has no items in it in 1.12.2 (Or alternatively, if no slots have items in them). I already know how to search for a specific item in the first slot:




      /testforblock ~a ~b ~c hopper -1 {Items:[{id:"minecraft:dirt",Count:1b,Slot:0b}]}




      I've tried to search for minecraft:air as a way to detect nothing, but this doesn't seem to work. Any help is appreciated! It must be a command block solution (I know that you can detect an empty hopper "manually" by having a comparator output with redstone torch, but in my scenario the hopper and signal destination (command block location) are very far apart)







      minecraft minecraft-commands






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      asked 4 hours ago









      AndrewAndrew

      255




      255






















          1 Answer
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          In Minecraft 1.12.2, you can detect a hopper with no items in it with the command:



          /testforblock <x> <y> <z> hopper -1 {Items:[]}


          in one command block, followed by a conditional chain command block to do something when this is true.






          share|improve this answer








          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





















          • Wow I seriously overthought that... thank you!

            – Andrew
            2 hours ago












          Your Answer








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          1 Answer
          1






          active

          oldest

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          active

          oldest

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          active

          oldest

          votes









          3














          In Minecraft 1.12.2, you can detect a hopper with no items in it with the command:



          /testforblock <x> <y> <z> hopper -1 {Items:[]}


          in one command block, followed by a conditional chain command block to do something when this is true.






          share|improve this answer








          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





















          • Wow I seriously overthought that... thank you!

            – Andrew
            2 hours ago
















          3














          In Minecraft 1.12.2, you can detect a hopper with no items in it with the command:



          /testforblock <x> <y> <z> hopper -1 {Items:[]}


          in one command block, followed by a conditional chain command block to do something when this is true.






          share|improve this answer








          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





















          • Wow I seriously overthought that... thank you!

            – Andrew
            2 hours ago














          3












          3








          3







          In Minecraft 1.12.2, you can detect a hopper with no items in it with the command:



          /testforblock <x> <y> <z> hopper -1 {Items:[]}


          in one command block, followed by a conditional chain command block to do something when this is true.






          share|improve this answer








          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.










          In Minecraft 1.12.2, you can detect a hopper with no items in it with the command:



          /testforblock <x> <y> <z> hopper -1 {Items:[]}


          in one command block, followed by a conditional chain command block to do something when this is true.







          share|improve this answer








          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|improve this answer



          share|improve this answer






          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          answered 2 hours ago









          Jack L.Jack L.

          662




          662




          New contributor




          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





          New contributor





          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          Jack L. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.













          • Wow I seriously overthought that... thank you!

            – Andrew
            2 hours ago



















          • Wow I seriously overthought that... thank you!

            – Andrew
            2 hours ago

















          Wow I seriously overthought that... thank you!

          – Andrew
          2 hours ago





          Wow I seriously overthought that... thank you!

          – Andrew
          2 hours ago


















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