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yap, sure i can. Below is the code that i want to modify.
// Project description :PIC18F877A + 4x4 keypad + LCD are used to build a keypad door
// security system which will activate the relay and buzzer after
// a preset 6-digit password is entered.
// LCD will display...
I have thought that the for any one who wants to change password he should start with # following new six digits and finally old six digits to verify whether he is authinticated or not. So i only need to upgrade my code with that part of changing PIN and make it saved to EEPROM of PIC16f877a.
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