* Originally by Aaron Sherwood

 * Modified by Mangtronix

 *

 * Add this library to Sketch files

 *  https://github.com/mangtronix/IntroductionToInteractiveMedia/blob/master/code/p5.web-serial.js files

 *

 * You must include this line in your index.html (in Sketch Files) to load the

 * web-serial library

 *

 *     <script src="p5.web-serial.js"></script>

 *

 * Arduino code:

 * https://github.com/mangtronix/IntroductionToInteractiveMedia/blob/master/code/Week11Serial.ino

 */

​

let rVal = 0;

let alpha = 255;

let left = 0;

let right = 0;

​

​

function setup() {

  createCanvas(640, 360);

  noFill();

  //create an ellipse with x position changing and y (300) position constant 

}

​

function draw() {

  background(255);

​

  if (!serialActive) {

    fill(0)

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

  } else {

    fill(0)

    text("Connected", 20, 30);

  }

  let xPos = 300;

  xPos = map(alpha, 0, 1023, 0,width);

  ellipse(xPos, 150, 50, 50);

​

  console.log(rVal);

}

​

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

      // We take the string we get from Arduino and explicitly

      // convert it to a number by using int()

      // e.g. "103" becomes 103

      rVal = int(fromArduino[0]);

      alpha = int(fromArduino[1]);

    }

​

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

    //SEND TO ARDUINO HERE (handshake)

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

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

    writeSerial(sendToArduino);

  }

}

​