Tileable Keycard Reader Lock

What it does?
You put items in and it acts like an auto dispenser, except if you put the right item in it will output a signal which you can connect to whatever you want, very small and easy to change the key/keycard.

Uses -
1. Houses that requires a key to access.
2. Adventure maps that acquire searching for a key to access the next room, good because you don't need to worry of losing your item once you put it in.
3.Your imagination is the limit!

Note : in the middle hopper put 22 items that you want to use as the key and in the last hopper put one more key item, the gold block is where you would take the output out.

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Have fun, create creations, compact if you wish and see you later!

-RedstoneMagician