I have been making Password based Security system with using password.h and keypad.h libraries. for that i use Arduino UNO board.i need to get new function when i type the password end to start.. as a example my password = 1234, but i need to get new function when i type 4321. how do it?
I'm not sue if the password library can handle multiple passwords, maybe it can, I don't know. I myself was able to make a sketch that is able to use multiple passwords, but I am out of town right now, otherwise I would show you. It might be here on the forum if you search my name and look for anything resulting in passwords.
My dear friend, 
thanks for your comment.. i have done it. for that i use password.h library.