let gravity;

let position;

let led;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

​

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);

}

​

function draw() {

  background(255);

  if (!serialActive) {

    textAlign(CENTER);

    text("Press Space Bar to select Serial Port", width / 2, height / 3);

  } else {

    text("Connected", width / 2, height / 3);

  }

  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;

  }

  console.log(position.y);

  if (position.y >= 360) {

    led = 1;

  } else if (position.y <= 330) {

    led = 0;

  }

  wind.x = map(alpha, 0, 1023, -1, 1);

}

​

function keyPressed() {

  if (key == " ") {

    // important to have in order to start the serial connection!!

    setUpSerial();

  }

}

​

function readSerial(data) {

  console.log(data);

}

​

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);

    position.y = -mass;

    velocity.mult(0);

  }

}

​