Finally uploaded the code for the serial mode, and all you need to do is connect 9 push buttons to pins 2 to 10 and gnd.

Functioning in this version are "a" to "z" lower case, the enter key and the space key.

As there is no delete in serial, this is not activated, and i have left placeholders for other possible braille inputs. i haven't included numbers as these are the same as "a" to "j" in braille with a modifier character (much like we may use the # symbol)