let portName = "/dev/cu.usbmodem11201"; // fill in your serial port name here

let inData;

​

function setup() {

  createCanvas(400, 300);

  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

}

​

// 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 draw() {

   background(0);

   fill(255);

   text("sensor value: " + inData, 30, 50);

}

​

function serverConnected() {

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

}

​

function portOpen() {

  console.log("the serial port opened.");

}

​

function serialEvent() {

  inData = Number(serial.read());

}

​

function serialError(err) {

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

}

​

function portClose() {

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

}

​