Project report requirements: o A brief description of the design – Free Nursing Tutor

Project report requirements:

o A brief description of the design process you used to obtain the circuits. Be sure to point

out  why  you  chose  a  particular  design,  along  with  the  steps  you  took  to  minimize  the  

amount of hardware required. This includes

 State diagram

 State reduction

 Final (reduced) state table

o Include all design elements, such as truth tables, state diagrams, tables, etc,

o Test the device in the simulator. Include a test plan:

 Include your secret code for verification

 Example inputs, expected outputs and what happened when you tested.

 Descriptions, along with a detailed explanation of what simulations you did, what

they show, to demonstrate that the circuit works properly under “all” circumstances.

NOTE that all Logisim implementations must meet all labeling requirements, as established at the

start of the semester (see Lab 1)

Project Description

There  are  many  security  and  access  control  devices  on  the  market  that  attempt  to  prevent

unauthorized access to secured areas. One such device is a key-pad based device. To unlock the

door, you must enter a secret decimal code. For example, say a device accepts a 4-digit decimal

code, 1234. The device will unlock the door when “1234” is entered, but it will not unlock if “123”

or “123411” is entered.

For your final project, you are to design an access control system based on a sequence of 6 bits

that accepts a 1-bit at a time, either 0 or 1. This could be implemented with a 2-button keypad (o

and 1), used to enter the binary code.  

A second input functions as the Enter key, which ends the key code entry. As the key is entered,

the device outputs Enter = 0 until the input sequence terminates. If the input sequence matches the

access code, then output Enter =1  (for example LED lights up), which will unlock the door in a

full implementation. The secret code is preset: choose your own code (see below).

After two unsuccessful attempts (i.e. the secret code was not matched), the system shuts down and

won’t  accept  any  more  bits,  and  an  alarm  is  triggered.  Thus,  your  circuit  has  a  second  output

Alarm, which is set to 1 after two unsuccessful attempts.

Extra credit: Add a reset to the system that presumably only the owner could control: when the

reset key is inserted, the system is again enabled and can accept bits again. You can code the reset

as either 0 (no key) or 1 (key inserted) for this project.

Secret code:  

 Each of you has their very own secret code: no 2 people in the class can have the same


 Your code can NOT be a simple sequence of all 1s or all 0s, and must contain a minimum

of 2 ones and 2 zeroes

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