zeko,
For information on VIs look at the LabVIEW Help files, the on-line tutorials, and other information on NI's web site.
For the pH analyzer you need to be more specific about what you are trying to do. Are you going to actaully measure pH with the computer and LV? If so, what kind of data acquisition hardware do you have?
The design process is the same regardless of the details of the implementation. First you need to define the specifications for the device you are going to design. What accuracy and resolution do you need on pH? What kind of probes will you be using? How fast do the measurements need to be taken? What are you going to do with the data after you get it?
Then you can begin to design the instrument.
Lynn
