// 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); 
  } 
}