var portName;

//var data = { "sensor1": -1, "sensor2": -1, "sensor3": -1};

var data;

var dataOK = false;

​

function setup() {

  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('open', portOpen);

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

  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

  createCanvas(400, 400);

}

​

// get the list of ports, standard version

function printList(portList) {

  // portList is an array of serial port names

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

    // Display the list the console:

    console.log(i + " " + portList[i]);

  }

} 

​

function draw() {

  background(255, 0, 200);

  fill(255);

  // console.log("Hi from the draw loop");

  // console.log(data);

  if (dataOK) {

    text("Sensor1 is " + data.sensor1, 100, 100);

    text("Sensor2 is " + data.sensor2, 100, 150);

    text("Sensor3 is " + data.sensor3, 100, 200);

  }

}

​

function portOpen() {

  console.log("--OPEN! Connected with " + portName);

}

​

function portClose() {

  console.log('The serial port closed.');

}

​

function serverConnected() {

  console.log('connected to server.');

}

​

function serialEvent() {

  var inString = serial.readLine();

  if (inString.length > 0) {

    console.log(inString);

    data = JSON.parse(inString);

    console.log(data);

    dataOK = true; //could check this

  }

}

​

function serialError(err) {

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

}

​

function portClose() {

  console.log('The serial port closed.');

}