import processing.serial.*;
import java.awt.Robot;
import java.awt.event.KeyEvent;

Serial myPort;  // Create object from Serial class

String buttonsPressed = "";
Robot r;
boolean stopped = false;

void setup(){
  String portName = "COM13";//Serial.list()[0];
  myPort = new Serial(this, portName, 115200);
  try{
  r = new Robot();
  }
  catch(Exception e){}
}

void draw(){
  buttonsPressed = "";
  while ( myPort.available() > 0) {  // If data is available,
    int c = myPort.read();         // read it and store it in val
    if ((char)c != '\n' && (char)c != '\r'){
       buttonsPressed += (char)c;
    }
    else break;
  }
  if (buttonsPressed.isEmpty()==false && buttonsPressed.length()==4){
    println(buttonsPressed);

    if (buttonsPressed.charAt(0) == '1'){
      pressKey(KeyEvent.VK_N);
      while ( myPort.available() > 0) // If data is available,
        myPort.read();
      delay(500);
    }
    if (buttonsPressed.charAt(1) == '1'){

      if (stopped == false){
        pressKey(KeyEvent.VK_S);
        stopped = true;
      }
      else{
        pressKey(KeyEvent.VK_P);
        stopped = false;
      }
      while ( myPort.available() > 0) // If data is available,
        myPort.read();
      delay(500);
    }
    if (buttonsPressed.charAt(2) == '1'){
      pressKey(KeyEvent.VK_D);
    }
    if (buttonsPressed.charAt(3) == '1'){
      pressKey(KeyEvent.VK_U);
    }
  }
}

void pressKey(int c){
      r.keyPress(KeyEvent.VK_CONTROL);
      r.keyPress(KeyEvent.VK_ALT);
      r.keyPress(KeyEvent.VK_SHIFT);
      r.keyPress(c);
      r.keyRelease(KeyEvent.VK_CONTROL);
      r.keyRelease(KeyEvent.VK_ALT);
      r.keyRelease(KeyEvent.VK_SHIFT);
      r.keyRelease(c);
}