// date: 13 April 2023

// class: Intro to IM

// professor: Michael Shiloh

// description:

// week 11 homework ex.3 -

// gravity wind example with LED lighting up everytime ball touches the ground and potentiometer being used to control the direction and power of the wind

​

let velocity;

let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let isBouncing = 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, 230, 240);

​

  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;

      isBouncing = 1;

    } else {

      isBouncing = 0;

    }

  }

}

​

function keyPressed() {

  if (key == " ") {

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

    setUpSerial();

  } else if (key == "ENTER") {

    mass = random(15, 80);

    position.y = -mass;

    velocity.mult(0);

  }

}

​

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 potValue = int(fromArduino[0]);

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

    }

​

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

    //SEND TO ARDUINO HERE (handshake)

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

    let sendToArduino = isBouncing + "\n";

    writeSerial(sendToArduino);

  }

}

​

function applyForce(force) {

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

​

//Arduino Code

/*

int ledPin = 2;

const int potPin = A1;

​

void setup() {

  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(ledPin, OUTPUT);

  pinMode(potPin, INPUT);

  // start the handshake

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

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

    Serial.println("0,0"); // 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

    digitalWrite(ledPin, LOW);

    int isBouncing = Serial.parseInt();

    if (Serial.read() == '\n') {

      int potValue = analogRead(potPin);

      delay(5);

      Serial.println(potValue);

    }

    // Set LED brightness based on whether bouncing.

    if (isBouncing == 1) {

      digitalWrite(ledPin, HIGH);

    } else {

      digitalWrite(ledPin, LOW);

    }

  }

  digitalWrite(LED_BUILTIN, LOW);

}

*/

​