A little two-bit state machine decides which code is required to enter the next state. The fourth state equals to the lock being open. A wrong code in any state resets to the first state.
To test the project, refer to its Wokwi, which is public.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | |||
| 1 | |||
| 2 | |||
| 3 | |||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |