This combo lock uses a cascading logic gate format to verify an ordered code. What happens is when yo press the first correct button, you trigger an RS-Nor, which will trigger "half" of an And gate.The other "half" is hooked up to the second button in the sequence.The output of this And gate is fed into another RS-Nor gate, which is fed into another And gate, whose other input is linked up to your third button.This And gate is fed into another RS-Nor gate,and so on until all buttons are connected.Then, the last And gate's output is fed into another And gate, whose other input comes from an RS-Nor Gate,which is attached to an enter button,that final And gate's input is linked up to the door. In addition to that, there is a reset button, that resets all RS-Nor gates.

Now, in this new update, I have added a binary counter! It will keep track of how many guesses you've taken, and after every four tries, it will reset the system!

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Additional Notes

The code is 1-2-4-8

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