entropi

The link to "Designing for Class Libraries" on msdn above is a great starting point. For naming in particular, see the subsection: http://msdn.microsof...y/ms229002.aspx We used this as the starting point influence for our own internal coding guidelines.

...and I suppose 1.2k/1.8k would work just as well.

I think a voltage divider circuit is probably the way to go, and using only 2 resistors, should be the most affordable. I'm a decade or so out from that last time I used any of this EE knowledge, so hopefully I'm getting this correct (been breaking out my old circuits textbook at night to refresh my memory). Hopefully someone can chime in if I'm off on any details here...

I think using a 12k and an 18k resistor should get you the correct ratio (~1.5 ) to divide 5v down to 3.3v. With the 12k resistor in series on the analog line of the shield buttons, and then after that parallel out the 18k resistor to ground...

lcdboard ----> 12k R ----------> Netduino analog in
                       |
                       |
                    18k R
                       |
                  Ground

(Hopefully that shows up right..the 18k resistor line is split out after 12k R, before netduino in.)