I've been searching around trying to figure out how to do this but alas I can't figure it out :( I am trying to send data from Arduino to processing and have processing spit out a text file that I will then have Arduino read. I have 8 RGB LEDS with 3 shift registers, a DHT Temp Sensor, a photoresistor, and an electret microphone. The input from the 3 senors are controlling the color of the RGB LEDS. My code on the Arduino side works but I can't get processing to read the data and save it to a text file. Here is my code so far (it's probably all wrong, I'm new to programming)

1. import processing.serial.*;
   Serial myPort;
   PrintWriter output;
   int r;
   int g;
   int b;
   
   void setup() {
     output = createWriter("data/data.txt");
     myPort = new Serial(this, "/dev/tty.usbmodemfa121", 9600);
     myPort.bufferUntil('\n');
   }
   
   void serialEvent(Serial myPort){
     String myString = myPort.readStringUntil('\n');
     int data [] = int(split(myString, ','));
     if (data.length > 1) {
       r = data[0];
       g = data[1];
       b = data[2];
       println("Printing RGB Vals to File");
       output.println(r+","+g+","+b);
       output.flush();
     }
   }
   
   void stop(){
     output.close();
     super.stop();
   }