Toll Door

Ever wanted to charge others for entry to an area? Here's how...

This simple system opens the iron door when a single item of your choosing is dropped into the hopper. The key that makes this possible is the 2-hopper system. The bottom hopper is held static by a redstone signal. With 22 items (of the same type) spread in each of the hopper's slots, the redstone comparator attached to it will be balanced on the cusp of sending out a 2-block long signal. When a player tosses the correct item into the top hopper, it falls into the second hopper, stacking with the item you've already spread inside, and the balance of power shifts for just a tick. The comparator sends a 2-block long signal, activating the circuit. The single tick is enough to deactivate the redstone signal keeping the bottom hopper locked, dropping the player's fee into the chest for storage. Meanwhile, a second signal opens the iron door and keeps it open for a few moments while the player passes through. How long the door remains open can be tweaked by changing the delay on the series of repeaters. Et voila!

I was asked the other day to make this project on the fly and so I've decided to share it with you guys. Hope you enjoy! Drop me a diamond if you do!