string data, what am I missing?

Projects Programming
3 
char lineOne[16];

lineOne = "Measuring";

"strings" are annoying to deal with, because you can't use "normal" C operators like "=" or "+" with them; they are essentially (exactly) arrays, and you can't say lineOne = "Measuring"; any more than you could say "myarray = {1,2,3,4,5};"
Instead, you have to use functions. "strcpy" is efficient to use for simple cases, "sprintf" is something you can look at to do more complicated formatting.

strcpy(lineOne, "Measuring");
//or (better):
strcpy_P(lineOne, PSTR("Measuring"));