import processing.serial.*;
public static boolean isOnline = false;
Serial myPort;  // Create object from Serial class
int val;      // Data received from the serial port

void setup()
{
  size(200, 200);
  // I know that the first port in the serial list on my mac
  // is always my  FTDI adaptor, so I open Serial.list()[0].
  // On Windows machines, this generally opens COM1.
  // Open whatever port is the one you're using.

 
  //
      try {
          String portName = Serial.list()[0];
       myPort = new Serial(this, portName, 9600);
      myPort.clear();
      isOnline = true;
    }
    catch(Exception e) {
      System.out.println("no hardware connected.");
    }
}

void draw()
{
  if ( myPort.available() > 0) {  // If data is available,
    val = myPort.read();         // read it and store it in val
  }
  background(255);             // Set background to white
  if (val == 3) {              // If the serial value is 2,
    fill(0);                   // set fill to black
 
} else if (val == 1) {
    fill (204);
} else {                    
    fill (204, 102, 0);            
 
} rect(50, 50, 100, 100);
}