#define works with either case, but I always prefer to have the defines in upper case, just to differentiate them.

>Andrews,
>
> also, I would make sure that that if you mention a constant in your main program in uppercase, it's in uppercase in the .H file. I know that variables are non case-sensitive, but I'm not sure if it's the case with #defines. I'm at home, so can't test this.
>
>Regards,
>Neil