let pulse = 255;

let left = 0;

let right = 0;

​

​

function setup() {

  createCanvas(600,600);

  textSize(18);

}

​

function draw() {

  // one value from Arduino controls the background's red color

  background(0);

​

  // the other value controls the text's transparency value

  fill(255, 255, 255);

  strokeWeight(0);

​

  if (!serialActive) {

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

  } else {

    text("Connected", 20, 30);

  }

  drawingContext.shadowBlur = 80;

  drawingContext.shadowColor = color(255);

  ellipse(width/2, height/2, map(pulse, 0, 255, 10, 100))

​

}

​

​

function keyPressed() {

  if (key == " ") {

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

    setUpSerial();

  }

}

​

// This function will be called by the web-serial library

// with each new *line* of data. The serial library reads

// the data until the newline and then gives it to us through

// this callback function

function readSerial(data) {

  ////////////////////////////////////

  //READ FROM ARDUINO HERE

  ////////////////////////////////////

​

  if (data != null) {

    // make sure there is actually a message

    // split the message

    let fromArduino = split(trim(data), ",");

    // if the right length, then proceed

    if (fromArduino.length == 2) {

      // only store values here

      // do everything with those values in the main draw loop

      rVal = fromArduino[0];

      pulse = fromArduino[1];

      print(pulse);

    }

​

    //////////////////////////////////

    //SEND TO ARDUINO HERE (handshake)

    //////////////////////////////////

    let sendToArduino = left + "," + right + "\n";

    writeSerial(sendToArduino);

  }

}