hi

i love daniweb because i feel free here and i know there are many people will help me
i surfed from low knowledge in hardware field or in another words inputs devices
i need some advice about how to made simple input devices
i thinking to bullied board contained 4 keys when i press any keys in the board
there a program will know what key i pressed and record my choice into database
the program coded in vb.net using serial ports
the questions is?

what books should i read
and advice from you

thank you