let velocity;

let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let LEDvalue = 1401;

let goRight = 0;

let goLeft = 0;

let first

​

function setup() {

  createCanvas(1000, 360); //create canvas

  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 textDisplay()

{

  text("PRESS SPACE TO START SERIAL PORT", width/2 - 109, height/2 - 5); //display the appropriate text in the start

}

​

function draw() {

  background(255);

  if (serialActive) //if the serial is active

  {

    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)  //if the ball touches the bottom

    {

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

      position.y = height-mass/2;

      LEDvalue = 1401; //take LED value to be 1401 because we dont want the value (1) to be lurking in the serial and then affecting the wind values

​

    }

    else

    {

      LEDvalue = 1400; //when the LED is off

    }

  }

  else

  {

    fill(0);

    textDisplay();

  }

}

​

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==' '){ //if space is pressed, then serial is set up

    setUpSerial();

  }

  if (keyCode == DOWN_ARROW) //if down arrow is pressed

  {

    //mass etc is changed

    mass=random(15,80);

    position.y=-mass;

    velocity.mult(0);

  }

}

​

function readSerial(data) //call back function

{

  let sendToArduino = LEDvalue + "\n"; //sends value of LED to arduino with \n added

  writeSerial(sendToArduino); //write to arduino

  if (data != null) //if the data is not null and something is received

  {

    console.log(data);

    if (data > 1450) //if the distance is greater than 1450, then

    {

      wind.x = 1; //the ball/wind goes right

    }

    else if (data < 1350) //if the distance is less than 1350

    {

      wind.x = -1; //the ball/wind goes left

    }

  } 

}