let portName = "not set";

let inData;

​

function setup() {

  serial = new p5.SerialPort();

  serial.on('list', printList);

  serial.on('open', portOpen); 

  serial.on('error', serialError);

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

​

  serial.list();

  console.log("Opening " + portName);

  createCanvas(400, 400);

}

​

function draw() {

  background(220);

}

​

//Once everything is set up and working, all the action happens here:

function serialEvent() {

  console.log("Serial event");

  var inString = serial.readLine();

  // check to see that there's actually a string there:

  if (inString.length > 0 ) {

  // convert it to a number:

    inData = Number(inString);

    console.log(inString);

  }

}

​

​

​

function printList(portList) {

  print("Inside printList");

  var candidatePort = "not set";

  var foundPort = false;

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

    // Display the list the console:

    console.log(i + portList[i]);

    if (portList[i].indexOf('usbmodem')>=0) {

      console.log(portList[i] + " is probably the Arduino");

      candidatePort = portList[i];

      foundPort = true;

    }

  }

  if (foundPort) {

    console.log("From list, opening " + candidatePort);

    serial.open(candidatePort);

  }    

}

​

function portOpen() {

  console.log('The serial port opened.')

}

​

function serialError(err) {

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

}