import processing.serial.*;
 Serial port;

 void setup() {
 size(256, 150);

 println("Available serial ports:");
 println(Serial.list());


 port = new Serial(this, Serial.list()[0], 9600);

 }

 void draw() {

 for (int i = 0; i < 256; i++) {
 stroke(i);
 line(i, 0, i, 150);
 }


 port.write(mouseX);
 }