Hi all, I need your help and will really appreciate it. I need to simulate some data into an arduino mega, and trying to use processing to read the same set of data and save it into a csv file, which will be used to plot graph. The problem am having now is writing the code that can do that communication between processing and arduino. Once again, I will sincerely appreciate your contribution. Can someone give me sample code? Thanks a lot.. 
There are many examples on the forum and the playground, have you searched for them ?
thank robtillaart.... any example code?
From the first hit - Arduino Playground - Processing -
Arduino comes with some basic examples for communicating with Processing (in Examples > Communication).
now its your turn...
not yet solution for there...