This the code for door security. It will use a keypad with LCD to enter the code for door entry. Buzzer sounds to for wrong password entered. It ll sound non-stop if it is entered more than 3 times.-This is the code for door security. It will use a keypad with LCD to enter the code for door entry. Buzzer sounds to for wrong password entered. It ll sound non-stop if it is entered more than 3 times.