I am currently at the end of my first Digital Logic class and need some help getting started on an assignment in which we are to create a digital combination door lock.
This class is online and we don't exactly have a textbook or any other resources at our disposal. I have tried to do this without asking for help, but I not having much luck. I searched for any resources that could help and haven't really found anything useful. So this is pretty much my last hope, seeing as I am not getting much help from my instructor either. We were given the choice to do this is Verilog or Logisim and I chose the latter, being that we spent more time with it this semester.
I need three inputs (pushbuttons) labeled A,B, & C. The hardcoded passcode will be A,B,C in that order. After the third letter is entered, if the combination is not correct then there should be a “Clear” input that will clear the attempt and permit the user to try again. After 3 incorrect attempts, input will be disabled until the circuit is reset.
It sounds simple in theory, but every time I try and get started by drawing up a diagram, I get lost. I know I would need to use D-Flip-flop or JK-Flip-flip in addition to three pushbuttons but other than that, I don't know what to do. I hate asking for help without having more done, but I can't really seem to even get started. Any help or suggestions would be greatly appreciated. We have been pretty much left to fend for ourselves with minimal resources all semester.
This class is online and we don't exactly have a textbook or any other resources at our disposal. I have tried to do this without asking for help, but I not having much luck. I searched for any resources that could help and haven't really found anything useful. So this is pretty much my last hope, seeing as I am not getting much help from my instructor either. We were given the choice to do this is Verilog or Logisim and I chose the latter, being that we spent more time with it this semester.
I need three inputs (pushbuttons) labeled A,B, & C. The hardcoded passcode will be A,B,C in that order. After the third letter is entered, if the combination is not correct then there should be a “Clear” input that will clear the attempt and permit the user to try again. After 3 incorrect attempts, input will be disabled until the circuit is reset.
It sounds simple in theory, but every time I try and get started by drawing up a diagram, I get lost. I know I would need to use D-Flip-flop or JK-Flip-flip in addition to three pushbuttons but other than that, I don't know what to do. I hate asking for help without having more done, but I can't really seem to even get started. Any help or suggestions would be greatly appreciated. We have been pretty much left to fend for ourselves with minimal resources all semester.