​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(220,100,100);

  fill("green");

  ellipse(left, 30, 30, 30);

}

​

function keyPressed() {

  if (key == " ") {

    // important to have in order to start the serial connection!!

    setUpSerial();

  }

}

​

function readSerial(data) {

  left = map(data, 0, 1023, 0, 400);

}