This video, titled ‘Compact and Secure Combination Lock [Minecraft Redstone Tutorial]’, was uploaded by ABRminecraft on 2012-11-10 22:23:54. It has garnered 205802 views and 1299 likes. The duration of the video is 00:08:23 or 503 seconds.
World download: http://www.planetminecraft.com/project/combination-lock-by-abrminecraft/
This is an order sensitive combination lock with buttons. The circuit is super compact and secure. The combination lock has 6 buttons, but it is possible to make it bigger.
Each button has one RS NOR latch. When all the RS NOR latches are activated, the combination is correct, and the circuit sends a short pulse from the output. The pulse goes to a T flip-flop that controls the piston door. If the wrong button is pressed, the circuit actomatically resets. This makes the lock very safe!
HOW TO CHANGE PASSWORD: Connect the wires from the buttons on the wall to different RS NOR latches.
If the circuit doesn’t work, watch this video with a better T flip-flop: http://www.youtube.com/watch?annotation_id=annotation_246714&feature=iv&src_vid=xFq9vEND2d0&v=zC8m64ZifZs#t=42s
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– bvtv