I've written a little lock program using a 4x4 matrix keypad, lcd screen and password.h library. All works fine multiple users can type in their code and lock and unlock the system. I now want to make the system a bit more user friendly and allow the option to change user codes on the fly and store them on the eeprom. The problem I'm having is how do I change the hard coded passcodes and what is the best way to then display them on the lcd screen after modification.
I have tried searching through the forum but not found any answers, any help will be gratefully received