​

let rVal = 0;

let alpha = 255;

let left = 0;

let right = 0;

let LED_value;

​

// the bouncing ball code

let velocity;

let gravity;

let position;

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);

  textSize(18);

}

​

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) {

      LED_value = 255;

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

      position.y = height-mass/2;

    }

  else{

    LED_value = 0;

  }

  print(LED_value);

​

  // one value from Arduino controls the background's red color

  // background(map(rVal, 0, 1023, 0, 255), 255, 255);

​

  // the other value controls the text's transparency value

  // fill(255, 0, 255, map(alpha, 0, 1023, 0, 255));

​

  if (!serialActive) {

    fill("black");

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

  } else {

    fill("black");

    text("Connected", 20, 30);

    text("press left or right to change wind direction, and press k to drop another ball",20, 60)

  }

  fill("white");

​

  // click on one side of the screen, one LED will light up

  // click on the other side, the other LED will light up

  if (mouseIsPressed) {

    if (mouseX <= width / 2) {

      left = 1;

    } else {

      right = 1;

    }

  } else {

    left = right = 0;

  }

}

​

function keyPressed() {

  if (key == " ") {

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

    setUpSerial();

  }

  if (keyCode==LEFT_ARROW){

    wind.x=-1;

  }

  if (keyCode==RIGHT_ARROW){

    wind.x=1;

  }

  if (key=='k'){

    mass=random(15,80);

    position.y=-mass;

    velocity.mult(0);

  }

}

​

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 readSerial(data) {

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

  //READ FROM ARDUINO HERE

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

​

  if (data != null) {

    // make sure there is actually a message

    // split the message

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

    // if the right length, then proceed

    if (fromArduino.length == 2) {

      // only store values here

      // do everything with those values in the main draw loop

      rVal = fromArduino[0];

      alpha = fromArduino[1];

    }

​

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

    //SEND TO ARDUINO HERE (handshake)

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

    let sendToArduino = LED_value + "\n";

    writeSerial(sendToArduino);

  }

}

​

//Arudino Code

/*

void setup() {

  Serial.begin(9600);

  pinMode(2, OUTPUT);

  pinMode(5, OUTPUT);

  // start the handshake

  while (Serial.available() <= 0) {

    Serial.println("0,0"); // send a starting message

    delay(300);            // wait 1/3 second

  }

}

​

void loop() {

  // wait for data from p5 before doing something

  while (Serial.available()) {

    int left = Serial.parseInt();

    // int right = Serial.parseInt();

    if (Serial.read() == '\n') {

      analogWrite(2, left);

      // digitalWrite(5, right);

      int sensor = 3;

      delay(1);

      int sensor2 =3;

      delay(1);

      Serial.print(sensor);

      Serial.print(',');

      Serial.println(sensor2);

    }

  }

}

*/

​