import processing.serial.*;

Serial port;

color fillVal = color(0);
color backVal = color(255);

char letter = 'n';

//motor full forward = 100
//motor neutral = 50
//motor reverse = 0

void setup()
{
  size(500, 500);
  println(Serial.list());
  port = new Serial(this, Serial.list()[0], 19200);
}

void draw()
{
  background(backVal);
  fill(fillVal);
  rect(200, 200, 100, 100);
  if (keyPressed)
  {
    if (key == CODED)
    {
      switch(keyCode)
      {
        case UP:
          fillVal = 100;
          port.write("10000,10000,e");
          break;
        case DOWN:
          fillVal = 150;
          port.write("20000,20000,e");
          break;
        case LEFT:
          fillVal = 200;
          port.write("20000,10000,e");
          break;
        case RIGHT:
          fillVal = 250;
          port.write("10000,20000,e");
          break;
      }
    }
    switch(key)
    {
      case 'a':
        fillVal = 175;
        port.write("30000,30000,e");
        break;
      case 'd':
        fillVal = 225;
        port.write("40000,40000,e");
        break;
    }
  }
  else
  {
    fillVal = 0;
    port.write("5000,5000,e");
  }
}