let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let ledON = 0;

​

function setup() {

  createCanvas(640, 480);

  textSize(18);

  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) {

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

  } else {

    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;

      ledON = 1;

    } else {

      ledON = 0;

    }

  }

  print(ledON);

}

​

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();

  }

}

​

function readSerial(data) {

  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 == 1) {

      // only store values here

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

      let xValue = int(fromArduino[0]);

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

    }

​

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

    //SEND TO ARDUINO HERE (handshake)

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

    let sendToArduino = ledON + "\n";

    writeSerial(sendToArduino);

  }

}

​

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

//////ARDUINO CODE////////

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

​

// int ledPin = 2;

​

// void setup() {

//   Serial.begin(9600);

​

//   pinMode(LED_BUILTIN, OUTPUT);

​

//   // Outputs on these pins

//   pinMode(ledPin, OUTPUT);

​

//   // start the handshake

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

//     digitalWrite(LED_BUILTIN, HIGH); // on/blink while waiting for serial data

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

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

//     digitalWrite(LED_BUILTIN, LOW);

//     delay(50);

//   }

// }

​

// void loop() {

//   // wait for data from p5 before doing something

//   while (Serial.available()) {

//     digitalWrite(LED_BUILTIN, HIGH); // led on while receiving data

​

//     int right = Serial.parseInt();

//     if (Serial.read() == '\n') {

//       digitalWrite(ledPin, right);

//       int pot = analogRead(A1);

//       delay(5);

//       Serial.println(pot);

//     }

//   }

//   //digitalWrite(LED_BUILTIN, LOW);

// }