let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let heightOfBall = 0;

​

function setup() {

   createCanvas(640, 360); // Create a canvas of 800x400 pixels

  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(215);

  fill(0);

  if (!serialActive) {

    text("Press Space Bar to select Serial Port", 20, 30);

  } else {

    text("Connected", 20, 30);}

  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;

    }

​

}

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 == " ") {

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

    setUpSerial();

  }   

   if (key=='s'){

    mass=random(15,80);

    position.y=-mass;

    velocity.mult(0);

  }

}

​

​

​

// this callback function

function readSerial(data) {

    ////////////////////////////////////

    //READ FROM ARDUINO HERE

    ////////////////////////////////////

     if (data != null) {

    // make sure there is actually a message

    console.log(data);

    console.log("fromArduino");

    let fromArduino = split(trim(data), ",");

    // if the right length, then proceed

    console.log(fromArduino);

    if (fromArduino.length == 2) {

            console.log("data is here ")

            console.log(data);

            //wind.x += data; 

          //////////////////////////////////

          //SEND TO ARDUINO HERE (handshake)

          //////////////////////////////////

             console.log("position.y");

             console.log(position.y);

​

          if (position.y + mass/2 == height)

         { 

           heightOfBall =0; 

         }

            else{

              heightOfBall = 1;

            }

             console.log("height of ball = ");

             console.log(heightOfBall);

​

          let sendToArduino = heightOfBall  + "\n";

          writeSerial(sendToArduino);

          }

  }

}