let portName = "/dev/cu.usbmodem1412201"; // fill in your serial port name here

​

let velocity;

let gravity;

let position;

let acceleration;

let wind = 0;

let drag = 0.99;

let mass = 50;

let hDampening;

let onOff = 0;

​

function setup() {

  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

​

  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, 0.98, 0.96);

}

​

function draw() {

  background(255);

​

  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

​

    //     // turning on/off led

    if (onOff) {

      onOff = 0;

    } else {

      onOff = 1;

    }

    position.y = height - mass / 2;

  }

}

​

function applyForce(force) {

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

​

// get the list of ports:

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 keyPressed() {

  if (key == " ") {

    mass = random(15, 80);

    position.y = -mass;

    velocity.mult(0);

  }

}

​

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();

  if (inString != "") {

    if (inString > 8 && inString < 12) {

      wind.x = 0;

    } else if (inString >= 12) {

      wind.x = 1;

    } else if (inString >= 0 && inString < 12) {

      wind.x = -1;

    }

  }

​

  serial.write(onOff);

}

​

function serialError(err) {

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

}

​

function portClose() {

  print("The serial port closed.");

}

​