hello. i am currently working in my institutional project..it is a digital electronic lock, using an lcd and a 4 x 4 keypad. i'm having problem maximizing the pins of my PIC16f628a. A conventional 4 x 4 keypad uses 8 pins of the pic microcontroller. is there anybody has an idea on how to convert an 8 pin keypad interface to 4 pin keypad interface? hope someone can solve my problem..thank you ver much!!!