var portName = 'COM6';

var inData;

var outByte = 0;

​

function setup() {

  createCanvas(400, 300);

  serial = new p5.SerialPort(); 

  serial.on('data', serialEvent);

  serial.on('error', serialError);

  serial.open(portName);

}

​

​

function serialEvent() {

  var inByte = serial.read();

  inData = inByte;

}

​

function serialError(err) {

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

}

​

function draw() {

  background(0);

  fill(255);

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

}

​

​

function mouseDragged() {

  outByte = int(map(mouseY, 0, height, 0, 255));

  serial.write(outByte);

}

​

function keyPressed() {

 if (key >=0 && key <=9) { 

 outByte = byte(key * 25); 

 }

 serial.write(outByte); 

​

​

​

}