​

var x = 0;

​

function setup() {

    createCanvas(400, 400);

    serial = new p5.SerialPort();

    serial.list();

    serial.open("/dev/cu.usbmodem1421");

    // serial.on('connected', serverConnected);

    serial.on('data', doSomething);

}

​

function draw() {

    background(220);

    ellipse(x, height/2, 50, 50);

}

​

function serverConnected(){

    print("connected to server");

}

​

​

function doSomething(){

    // get the data

    var currData = serial.readLine();

    // clean it up

    trim(currData);

    if (!currData) return; 

    x = int(currData);

    print(x);

}