Do you have so many furnaces, you lose track of which ones have your stuff in them? Well then I have the invention for you! This device turns on a light above the furnace if any items are inside it. It is cheap and easy to make!

Materials Needed:

• 1 Furnace
  
• 3 Redstone
  
• 1 Comparator
  
• 1 Repeater
  
• 5 Building Blocks
  
• 1 Redstone Lamp
  

Part 1:

Place 2 blocks as shown. (They do not have to be wool)




Part 2:


Place a comparator leading into a repeater on the 2 blocks you just placed. Place another block on the end of the repeater and a furnace in front of the comparator.

Part 3:

Place a redstone lamp on top of a furnace and a block on top of the repeater and comparator.

Part 4:

Place 3 redstone on the visible building blocks. Now you are done!

Part 5:

Cover the furnace and lamp if you wish. Enjoy!

Please leave any suggestions for what I should do next in the comments below. Thank you for taking the time to read my project!