Combo Locked Door

This is how you make a redstone-powered combo locked door!
NOTE: Every step has a different picture, so be sure to look at them!

STEP 1:
Create a frame for your door.
Simple, but yet so important.

STEP 2:
Place levers 1 block apart.
Be sure to leave 2 blocks of space between the first lever and the door.
STEP 2.5:
Set your code(flip levers to what you want them to be to open door)

STEP 3:
Place Redstone Torches on the back of the levers.

STEP 4:
Place blocks under the torches that are on.
STEP 4.5:
Destroy the torches that have a block under.
Place redstone. BE SURE TO PLACE IT UNDER THE TORCH TOO.

STEP 5:
Create an inverter.

STEP 6:
Create an AND gate.
Put redstone in between the two top torches.

STEP 7:
Dig a 3 block deep line to under the door.

STEP 8:
Place 2 redstone going out of the back torch on the AND gate.

STEP 9:

Put redstone in the hole, to the door.
Be sure to get under the door, leaving a block in between the redstone and the door.

Step 10:
Add the button next to the door.

Step 11:
Put redstone straight to the other AND gate port.

You are finished!

Tips:
You may want to put some repeaters on the redstone path to the door, for time to get in the door.

You should make the door open to a staircase, so the redstone wires are hidden and you can have an actual house.

Cover up the redstone to the door as a wall of your house.

Use at least 6 levers for a harder code to solve. It's better protection for you and your stuff.

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Additional Notes

Easy and quick house protection.