this projects works by taking 4 inputs for number 0-9. The first 4 number inputed will be the new combo (0000 is not an input zero should be 0001). Then to "unlock" press your combo again. to reset and enter a new combo the unlock must be high and reset must be pressed, or master reset must be pressed.
Enter 4 single digits in binary into input 0-4, each input must be followed by 0000. Then input the same 4 digits in each followed by 0000 to make unlock high. a valid input would look some think like this: 0001, 0000, 0101, 0000, 1001, 0000, 0011, 0000, then 0001, 0000, 0101, 0000, 1001, 0000, 0011, 0000, will make unlock high.
| # | Input | Output |
|---|---|---|
| 0 | input 0 | unlock |
| 1 | input 1 | |
| 2 | input 2 | |
| 3 | input 3 | |
| 4 | reset | |
| 5 | master reset | |
| 6 | ||
| 7 |