import processing.serial.*;

Serial myPort;
String portAddress="/dev/ttyUSB1";
void setup(){
  size(660,380);
  background(0);
  noFill();
  myPort = new Serial(this, portAddress, 9600);
}

void draw(){
  size(660,380);
  background(0);
  noFill();
  while (myPort.available() > 0){
    
    char inByte = myPort.readChar();
    
    if(inByte == 'd'){
    stroke(255,0,0);
    fill(255,0,0);
    ellipse(200,200,30,30);
    
  }
    else if(inByte == 'u'){
    stroke(162,211,172);
    fill(162,211,172);
    ellipse(450,200,30,30);
    
    }
    
    
  }
}