// https://editor.p5js.org/aaronsherwood/sketches/I7iQrNCul

// https://editor.p5js.org/aaronsherwood/sketches/q2Pl77SWl

// 

// Instead of using a keyboard, this version communicates with Arduino

// to receive inputs. In the circuit, a button, a potentiometer, and an LED

// are placed for a digital input, an analog output, and a digital output.

//

// Only lines of code that I wrote may be commented.

​

let hit = 0;  // whether the ball hit the ground

let reset = 0;  // whether Arduino sent a reset argument (a button press)

​

// Ball physics

let velocity;

let gravity;

let position;

let acceleration;

let wind; // wind direction is controlled by Arduino (potentiometer)

let drag = 0.99;

let mass = 50;

​

function setup() {

  createCanvas(600, 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);

  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;

    hit = 1;

  } else {

    hit = 0;

  }

​

  if (!serialActive) {

    console.log("Press Space Bar to select Serial Port");

  } else {

    // 

    // console.log("Connected");

    if (reset == 1) { // if reset signal is sent and flagged (button press)

      reset = 0; // clear the flag

      // reset ball with some random mass

      mass = random(15, 80);

      position.x = width / 2;

      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 keyPressed() {

  // Only SPACEBAR, which is used to setup serial remains.

  // All other keyboard interaction are removed

  if (key == " ") {

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

    setUpSerial();

  }

}

​

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

      reset = fromArduino[0];

      wind.x = fromArduino[1];

    }

​

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

    //SEND TO ARDUINO HERE (handshake)

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

    let sendToArduino = hit + "\n";

    writeSerial(sendToArduino);

  }

}

​

//Arudino Code

/*

int buttonSwitch = A2;

int potentiometer = A0;

int ledOut = 11;

​

void setup() {

  Serial.begin(9600);

  pinMode(12, OUTPUT);

  digitalWrite(ledOut, LOW);  // in the case of reconnection while p5 is running

  // start the handshake

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

    Serial.println("-1,-1");  // send a starting message

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

  }

}

​

void loop() {

  // wait for data from p5 before doing something

  while (Serial.available()) {

    int hit = Serial.parseInt(); // receives 1 argument, whether the ball hit the ground

    if (Serial.read() == '\n') {

      digitalWrite(ledOut, hit); // turn on LED if the ball is in contact with the ground (1 -> HIGH) turn off LED if not (0, -> LOW)

      int sensor = digitalRead(buttonSwitch); // read button

      delay(1);

      int sensor2 = analogRead(potentiometer); // read potentiometer

      delay(1);

      Serial.print(sensor); // button

      Serial.print(',');

      if (sensor2 < 512) { // potentiometer; depending whether the value is over or below half, direction of the wind is set

        Serial.println(1);

      } else {

        Serial.println(-1);

      }

    }

  }

}

*/

​