let val = 0;

function setup() {

  serial = new p5.SerialPort();

  serial.open("COM11");

  serial.on('data', gotData); 

  createCanvas(400, 400, WEBGL);

}

​

function draw() {

  background(20);

  directionalLight(val, val, 0, 1, 1, -1)

  fill(255);

  noStroke();

  sphere(100);

}

​

function gotData() {

  lecture = serial.readStringUntil('\n');

  if(lecture) {

    lecture = int(lecture)

    //console.log(val)

    val = map(lecture, 0, 1023, 0, 300);

  }

}