Asalm o Alikum sir
i m a student of electronics engineering , in order to develop my experties in electronics i m trying to do the same thing which u have done , i m have the way i have connected the keypad with contoler & it is transmiting the nuber pressed serialy & that can be seen on COMPUTER. i will be very tahnk full for ur help. one thing more i have bought a dispaly numberd as CCM-202B , do u have any idea abt taht dispaly ? have all the dispalys same pin cofig. plz reply me in this contact.
ok then waiting for ur reply

Allah Hafiz