To begin with, here is one of many project I have done.
It is a safe box controller using MCS48 (I know, it is ancient uP.... now).
But don't mind the uP type, the code has been one example of State Machine,
Keypad Scanning, and Display Scanning.
The idea was to enter code to lock the safe, and then re-enter the same code
to unlock it.
If you analyze the code, it also has a Default Password in case user forgot
the password.
The project was in 1992. I forgot what was the tool for creating the PCB.
I have the file (.PCB as extension) if you need it.
Source Code : key.h48
It is a safe box controller using MCS48 (I know, it is ancient uP.... now).
But don't mind the uP type, the code has been one example of State Machine,
Keypad Scanning, and Display Scanning.
The idea was to enter code to lock the safe, and then re-enter the same code
to unlock it.
If you analyze the code, it also has a Default Password in case user forgot
the password.
The project was in 1992. I forgot what was the tool for creating the PCB.
I have the file (.PCB as extension) if you need it.
Source Code : key.h48
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