Chicken Door Security Lock

I had bad experiences with predators eating my chicken, so I had to make the chicken coop more secure for the night.

This systems prevents the door being opened by pushing or pulling up the board.
The only way to unlock it, is to pull the rope of the door, which removes the hook.

No motor or complicated mechanics, a nice passive solution.

There is no particular instruction. Just print the parts, and screw them on the door like on the photo. It is of course better if the system is inside the coop.