// based on Tom Igoe's lab examples

​

const serial = new p5.WebSerial();

let portButton;

let inData =0;

let posX = 0,

  posY = 0,

  step = 10;

​

function setup() {

  createCanvas(400, 300);

  allSerialStuff();

}

​

function draw() {

  posX += step;

  if (posX > width) {

    posX = 0;

    posY += step;

    if (posY > height) posY = 0;

  }

  fill(inData);

  rect(posX, posY, step, step);

}

​

function serialEvent() {

  inData = Number(serial.read());

}

​

/*  

// Arduino Code 

void setup() {

  Serial.begin(9600);

}

void loop() {

  int analogValue = analogRead(A0);

  byte byteToSend = map (analogValue, 0, 1023, 0, 255);

  Serial.write(byteToSend);

  delay(50);

}

*/

​

​

​

​

​

function allSerialStuff() {

  if (!navigator.serial) {

    alert("WebSerial is not supported in this browser. Try Chrome or MS Edge.");

  }

  // check for any ports that are available:

  serial.getPorts();

  // if there's no port chosen, choose one:

  serial.on("noport", makePortButton);

  // open whatever port is available:

  serial.on("portavailable", openPort);

  // handle serial errors:

  serial.on("requesterror", portError);

  // handle any incoming serial data:

  serial.on("data", serialEvent);

  serial.on("close", makePortButton);

  // add serial connect/disconnect listeners:

  navigator.serial.addEventListener("connect", portConnect);

  navigator.serial.addEventListener("disconnect", portDisconnect);

}

// if there's no port selected,

// make a port select button appear:

function makePortButton() {

  // create and position a port chooser button:

  portButton = createButton("choose port");

  portButton.position(10, 10);

  // give the port button a mousepressed handler:

  portButton.mousePressed(choosePort);

}

​

// make the port selector window appear:

function choosePort() {

  if (portButton) portButton.show();

  serial.requestPort();

}

​

// open the selected port, and make the port

// button invisible:

// open the selected port, and make the port

// button invisible:

function openPort() {

  // wait for the serial.open promise to return,

  // then call the initiateSerial function

  serial.open().then(initiateSerial);

​

  // once the port opens, let the user know:

  function initiateSerial() {

    console.log("port open");

  }

  // hide the port button once a port is chosen:

  if (portButton) portButton.hide();

}

​

// pop up an alert if there's a port error:

function portError(err) {

  alert("Serial port error: " + err);

}

// read any incoming data as a string

// (assumes a newline at the end of it):

​

// try to connect if a new serial port

// gets added (i.e. plugged in via USB):

function portConnect() {

  console.log("port connected");

  serial.getPorts();

}

​

// if a port is disconnected:

function portDisconnect() {

  serial.close();

  console.log("port disconnected");

}

​

function closePort() {

  serial.close();

}

​