// Example by Tom Igoe

import processing.serial.*;

Serial myPort;  // The serial port:

void setup() {
  // List all the available serial ports:
  println(Serial.list());

  // I know that the first port in the serial list on my mac
  // is always my  Keyspan adaptor, so I open Serial.list()[0].
  // Open whatever port is the one you're using.
  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.write(45);
}

void draw() {
  while (myPort.available() > 0) {
    char lastIn = myPort.lastChar();
    println(lastIn);
  }
}