arduino keyboard

Hey I am very new to arduino, I waana make a project where in analog input I use 10 piezzo
disc. When I will knock on the disk and exceed the threshold it will send the PC via USB.
If I knock on disk 1 it will write on msword A, for disk 2= B.......disk 10= J.
Plz help me with the shetch.


You will need a Leonardo, Micro or Pro Micro type of Arduino for this. Have a look at this link:

How useful will this keyboard be if you can only type letters A to J?