//////////////////////////declare global variables/////////////////

import processing.serial.*;
Serial mySerial;

//begin at the beginning...
int start = 0;
int end = int(random(101));

//////////////////////////setup/////////////////

void setup() {

  ////environmen///
  size(200, 200);
  background(0);
  frameRate(30);

  ////create serial port for LED communications///
  println(Serial.list());
  mySerial = new Serial(this, Serial.list()[0], 9600);

  delay(1000); //give it oodles of time to settle down
}

//////////////////////////draw loop/////////////////

void draw() {

  // test A
  if (end >= start) {

    for (int i = start; i < end; i++) {
      int LED = int(i);
      mySerial.write(LED);

      if (i == end -1) {
        delay(5000);
      }
      else
      {
        delay(50);
      }
    } // end for loop

    start = end;
    end = int(random(101));

  }

  // test B
  if (end <= start) {

    for (int i = start; i > end; i--) {
      int LED = int(i);
      mySerial.write(LED);

      if (i == end + 1) {
        delay(5000);
      }
      else
      {
        delay(50);
      }
    } //end for loop

    start = end;
    end = int(random(101));
  }

}