let portName = "/dev/tty.usbmodem14201"; // fill in your serial port name here

let velocity;

let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let hDampening;

let inVal = 0;

let outVal = 0;

​

function setup() {

  createCanvas(640, 360);

  noFill();

  position = createVector(width/2, 0);

  velocity = createVector(0,0);

  acceleration = createVector(0,0);

  gravity = createVector(0, 0.5*mass);

  wind = createVector(0,0);

  hDampening=map(mass,15,80,.98,.96);

  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

}

​

function draw() {

  background(255);

  if (!keyPressed){

    wind.x=0;

    velocity.x*=hDampening;

  }

  applyForce(wind);

  applyForce(gravity);

  velocity.add(acceleration);

  velocity.mult(drag);

  position.add(velocity);

  acceleration.mult(0);

  ellipse(position.x,position.y,mass,mass);

  if (position.y > height-mass/2) {

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

      position.y = height-mass/2;

    }

 outVal = position.y >= height-mass/2-5 ? 255 : 0;

 wind.x = map(inVal, 0, 1023, -5, 5)*hDampening;

}

​

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 (key==' '){

    mass=random(15,80);

    position.y=-mass;

    velocity.mult(0);

  }

}

​

​

​

​

​

function printList(portList) {

  // portList is an array of serial port names

  for (let i = 0; i < portList.length; i++) {

    // Display the list the console:

    print(i + " " + portList[i]);

  }

}

​

function serverConnected() {

  print("connected to server.");

}

​

function portOpen() {

  print("the serial port opened.");

}

​

function serialEvent() {

  // read a string from the serial port

  // until you get carriage return and newline:

  let inString = serial.readLine();

  inVal = parseInt(inString);

  serial.write(outVal);

}

​

function serialError(err) {

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

}

​

function portClose() {

  print("The serial port closed.");

}