let portName = '/dev/tty.usbserial-1410'; 

let inData;

let xPos, yPos, buttonState;

​

function setup() {

  createCanvas(800, 800);

  background(0);

  serial = new p5.SerialPort(); 

  serial.on('data', serialEvent); 

  serial.on('error', serialError); 

  serial.open(portName); 

}

​

function draw() {

  background(0);

  fill(255);

  if (buttonState == 1) {

    ellipse(xPos, yPos, 40, 40);

  }

​

}

​

function serialEvent() {

  let inString = serial.readLine();

  if (inString.length > 0) {

    let sensors = split(inString, ",");

    if (sensors.length == 3) {

      xPos = Number(sensors[0]);

      yPos = Number(sensors[1]);

      buttonState = Number(sensors[2]);

    }

  }

}

​

function serialError(err) {

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

}

​

​