Seems Dotmatrix kit is hot out there…
Just come to mind… How about a dotmatrix as input device shield? Here is something interesting: cs.nyu.edu/~jhan/ledtouch/index.html 
Seems Dotmatrix kit is hot out there…
Just come to mind… How about a dotmatrix as input device shield? Here is something interesting: cs.nyu.edu/~jhan/ledtouch/index.html