​

let serial; // variable to hold an instance of the serialport library

let portName = '/dev/tty.usbmodem142101'; // fill in your serial port name here

​

let xPos = 0;

let yPos = 0;

let isLedOn = false;

​

function setup() {

  createCanvas(800, 600);

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

  serial.on('open', portOpen); // callback for the port opening

  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

  serial.open(portName); // open a serial port

​

  background(0);

}

​

function draw() {

  fill(255);

  noStroke();

  ellipse(xPos, yPos, 10, 10);

}

​

// get the list of ports:

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 serverConnected() {

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

}

​

function portOpen() {

  console.log('the serial port opened.')

}

​

function serialEvent() {

  const inString = serial.readStringUntil('\r\n');

​

  if (inString.length > 0) {

    const sensors = split(inString, ','); // split the string on the commas

    const leftPot = sensors[0];

    const rightPot = sensors[1];

    xPos = map(leftPot, 0, 1023, 0, width);

    yPos = map(rightPot, 0, 1023, 0, height);

  }

}

​

function serialError(err) {

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

}

​

function portClose() {

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

}

​

function keyPressed() {

  if (key === 'H' || key === 'L') { // if the user presses H or L

    console.log(key);

    serial.write(key); // send it out the serial port

  }

}