const serial = new p5.WebSerial();

// HTML button object:

let portButton;

let inData;                   // for incoming serial data

let outByte = 0;              // for outgoing data

let c; 

let outData; 

let bounces = 0; 

​

let velocity;

let gravity;

let pos;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

​

​

function setup() {

  createCanvas(640, 360);

  noFill();

  pos = createVector(width/2, 0);

  velocity = createVector(0,0);

  acceleration = createVector(0,0);

  gravity = createVector(0, 0.5*mass);

  wind = createVector(0,0);

​

  // check to see if serial is available:

  if (!navigator.serial) {

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

  }

  // if serial is available, add connect/disconnect listeners:

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

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

  // 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);

}

​

​

function draw() {

  background(255);

  applyForce(wind);

  applyForce(gravity);

  velocity.add(acceleration);

  velocity.mult(drag);

  pos.add(velocity);

  acceleration.mult(0);

  ellipse(pos.x,pos.y,mass,mass);

  if (pos.y > height-mass/2) {

    velocity.y *= -0.9;  // A little dampening when hitting the bottom

    pos.y = height-mass/2;

    bounces+=1; 

    outData = "H"; 

    serial.write(outData); 

    console.log(outData); 

  }

​

}

​

function applyForce(force){

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

​

function keyPressed(){

  if (keyCode==LEFT_ARROW){

    wind.x=-1;

  }

  if (keyCode==RIGHT_ARROW){

    wind.x=1;

  }

  if (key==' '){

    mass=random(15,80);

    pos.y=-mass;

    velocity.mult(0);

  }

}

​

​

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:

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):

function serialEvent() {

  inData = Number(serial.read());

  console.log(inData);

}

// 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();

}