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Maryam said:I have a pic16f84 microcontroller circuit ,I wan to put a keyboard for it to receive a password to work,but I 've used all R0-R7 except R3 ,how can I do that and what part of program should I add to mine?
Maryam said:I 've already used all my I/O pins except (RA3 & RB7) ,and I want a 4*3 keyboard . I think I should have a swithching in my I/O pins between keyboard and my LCD. how can I do this switching in hardware and whitch part of program should be added ?