Hi mega_mozg,

after studying and looking at your pictures and explanations, then comparing the prices at ebay:
http://www.ebay.com/itm/Leonardo-R3-Pro-...=item2ececa28e3

it seems that using arduino leonardo is better for only 6 axis & 42 buttons.

it has total 23 pins, 11 internal axis.
if I use only 6 axis, there are 17 pins left for button matrix.
so 17 is more than enough, for 42 buttons I only need 13 pins.
13 = 6+7
6 colums x 7 rows = 42 buttons.

so there is no need to add mcp3208.

is this correct?