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You need to properly configure your COM port in the setup. It's different for every computer. Change this line myPort = new Serial(this, Serial.list(), 9600);On my machine my arduino is the 2nd in this list, so I use the Serial.list(), maybe on yours its the first on the list, so put a zero there. Check your port selector in the arduino IDE to see whats connected to your PC.
Hey I've added the processing sketch as a .pde file because Instructables formatting kept messing with the code, my apologies!
You were right, the formatting cut of part of the processing code! It's all complete now, you just need the libraries specified in the text. To run an Arduino sketch, just hit the play button in the Arduino IDE!
NeoPixel Pattern Programmer View Instructable »