var portName = '/dev/cu.usbmodem1421';  // fill in your serial port name here

var inData;                             // for incoming serial data

let song;

​

function preload() { 

song = loadSound('assets/Hold_On.mp3', loaded);

}

​

function setup() {

  //song = loadSound('assets/Hold_On.mp3', loaded);

  song.setVolume(0.3);

  createCanvas(400, 300);

  serial = new p5.SerialPort();       // make a new instance of the serialport library

  serial.on('list', printList);  // set a callback function for the serialport list event

  serial.on('connected', serverConnected); // callback for connecting to the server

  serial.on('open', portOpen);        // callback for the port opening

  serial.on('data', serialEvent);     // callback for when new data arrives

  serial.on('error', serialError);    // callback for errors

  serial.on('close', portClose);      // callback for the port closing

  serial.list();                      // list the serial ports

  serial.open(portName);              // open a serial port

}

​

function loaded() {

  console.log('loaded');

}

​

function draw() {

  background(0);

  fill(255);

  text("button value: " + inData, 30, 30);

  if (inData == 1){ 

    togglePlaying();  

  }

}

​

function togglePlaying() {

  if (song.isPlaying() ) { // .isPlaying() returns a boolean

    song.stop();

  } else {

    song.play();

  }

}

​

// get the list of ports:

function printList(portList) {

 // portList is an array of serial port names

 for (var i = 0; i < portList.length; i++) {

 // Display the list the console:

 println(i + " " + portList[i]);

 }

}

​

function serverConnected() {

  println('connected to server.');

}

function portOpen() {

  println('the serial port opened.')

}

function serialEvent() {

  inData = Number(serial.read());

}

function serialError(err) {

  println('Something went wrong with the serial port. ' + err);

}

function portClose() {

  println('The serial port closed.');

}

​

function playSong() { 

  song.play(); 

} 

​

​