thanks, Steve and Rob. O yes, steve, it is possible. With the interupt INT line and block sensing ADC routine you can do it.
For Rob : i don't know where I can get a capacitive board. This resistive board comes from FARNELL. There is only one, suplied with an interface and WINDOWS software to use on a laptop etc...
What I wanna do is build some kind of a buttonboard. Its 250 x 180 mm, I will divide't in 70 "square's", so I will have 70 buttons. With a drawing on the back off the transparent board I can give every button a label, use 2 square's for one large button etc...
Or is there another (less cost) way to do it ? I don't wanna use ordinaire pushbutton or keypad :-(