let squareState = false;

let connection = new SerialConnection();

​

function setup() {

  connection.init()

  theSquare = createCanvas(240, 240);

  background(220);

  fill(0);

  stroke(255);

  rect(40, 40, 160, 160);

  theSquare.mousePressed(toggleSquare);

}

​

function toggleSquare() {

  background(220);

  if (squareState) {

    fill(0);

    stroke(255);

    connection.write('on');

    squareState = false;

  } else {

    fill(255);

    stroke(0);

    connection.write('off');

    squareState = true;      

  }

  theSquare = rect(40, 40, 160, 160);

}

​

function draw() {

}