​

function setup() {

  createCanvas(640, 480);

}

​

function draw() {

  background(255);

  fill(0);

  textSize(18);

  if (!serialActive) {  

    text("Press Space Bar to select Serial Port", 20, 30);

  } else {

    text("Connected", 20, 30);

  }

  fill(255,0,0)

  stroke(0)

  ellipse(map(x,0,1023,0,width),height/2,100,100)

}

​

function keyPressed() {

  if (key == " ") {

    setUpSerial();

  }

}

​

function readSerial(data) {

  if (data != null) {

    let fromArduino = trim(data); 

    x = int(fromArduino);

  }

}

​

​