We need to "see the code", not a picture. Please attach your actual VI -- this will let us examine it closely, make some changes, neaten it up so we can figure it out, see things that don't show up in a picture (like the other Case statements), and even execute pieces of the code.
It would be helpful to have a better idea of the signal you are trying to record. You mentioned the transducer, and we know that an Arduino is in the mix somewhere, but you don't say anything about the nature of the signal (I presume it is a voltage being sampled at some data rate, you don't tell us what that is).
It is difficult to tell from your post where the problem lies, or its nature. I'm going to guess that the problem is what to do with the data once you get it from Arduino -- if this is the case, a technique that often helps debug your code is to use Diagram Disable to surround you "data production" code (the stuff getting data from Arduino) and in the "enabled" side, put a For Loop with a Wait (ms) (to simulate the data sampling rate) that generates random numbers as your "simulated pressure". Run this through your processing loop and see if it works.
I'm not even going to bother looking at the picture you attached (since it will only make me want to start shouting "No Pictures, Attach Code!"), but if you reply with an attached VI, I'll take a look ...
Bob Schor
