Week 11 – Exercises

1. I used a photoresistor as input to control the position of the sphere.

p5js:

let xcord = 0;
let left=0;
let right=0;

function setup() {
  createCanvas(640, 480);
}

function draw() {
  background("white");
  
  if (!serialActive) {
    text("Press Space Bar to select Serial Port", 20, 30);
  } else {
    text("Connected", 20, 30);

    ellipse(xcord,height/2,100,100);
    console.log(xcord);

  }

}

function keyPressed() {
  if (key == " ") {
    // important to have in order to start the serial connection!!
    setUpSerial();
  }
}

function readSerial(data) {


  if (data != null) {

    let fromArduino = trim(data);

    xcord = int(fromArduino);
    
  }
}

Arduino:

int inPin = A0;

void setup() {
  // Start serial communication so we can send data
  // over the USB connection to our p5js sketch
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(inPin, INPUT);
}

void loop() {

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


  int sensor = analogRead(A0);
  delay(5);
  Serial.println(sensor - 300);

  digitalWrite(LED_BUILTIN, LOW);
}

2.

p5js:

let ycord;

function setup() {
  createCanvas(640, 480);
  textSize(18);
}

function draw() {

  if (!serialActive) {
    text("Press Space Bar to select Serial Port", 20, 30);
  } else {
    text("Connected", 20, 30);

  }

  if (mouseIsPressed) {
    ycord=mouseY;
    console.log(ycord);
  }
}

function keyPressed() {
  if (key == " ") {
    // important to have in order to start the serial connection!!
    setUpSerial();
  }
}

function readSerial(data) {

  if (data != null) {
    let fromArduino = trim(data);
                     
    let sendToArduino = ycord + "\n";
    writeSerial(sendToArduino);
    console.log("sent");
  }

}

Arduino:

int inPin = A0;
int outpin = 8;

void setup() {
  // Start serial communication so we can send data
  // over the USB connection to our p5js sketch
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(inPin, INPUT);
  pinMode(outpin, INPUT);
}

void loop() {

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

  int brightness = Serial.parseInt();
  if (Serial.read() == '\n') {
    digitalWrite(outpin, HIGH);
    delay(brightness/100);

    digitalWrite(outpin, LOW);
    delay(4.80-brightness/100);
  }
  Serial.println(brightness);
}

3. It works but the lag is insane.

Arduino:

int inPin = A0;
int outpin = 8;

void setup() {
  // Start serial communication so we can send data
  // over the USB connection to our p5js sketch
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(inPin, INPUT);
  pinMode(outpin, INPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, LOW);

  while (Serial.available()) {
    // led on while receiving data
    digitalWrite(LED_BUILTIN, HIGH);
    int left = Serial.parseInt();
    if (Serial.read() == '\n') {

      int sensor = analogRead(A0);
      Serial.println(sensor);
    }
    if (left >= 350 && left <= 360) {
      digitalWrite(outpin, HIGH);
    } else {
      digitalWrite(outpin, LOW);
    }
  }
  int sensor = analogRead(A0);
  Serial.println(sensor);
}

P5:

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, 0.1*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;
    }
}

function readSerial(data) {
    ////////////////////////////////////
    //READ FROM ARDUINO HERE
    ////////////////////////////////////
  
    if (data != null) {
    // make sure there is actually a message
    
    let fromArduino = trim(data);
   
    //console.log(fromArduino);
    let sensorVal = int(fromArduino);
      
    if (sensorVal < 600){
      wind.x=1;
    }
    else if(sensorVal >= 600 && sensorVal < 800){
      wind.x = 0;
    }

    else {
      wind.x = -1;
    }
//           //////////////////////////////////
//           //SEND TO ARDUINO HERE (handshake)
//           //////////////////////////////////
  }
  else{
    console.log("empty input");
  }
//height of ball sent to arduino to check if ball on floor or not
  let sendToArduino = position.y + 0.5 * mass + "\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);
}

function keyPressed(){
  if (keyCode==LEFT_ARROW){
    wind.x=-1;
  }
  if (keyCode==RIGHT_ARROW){
    wind.x=1;
  }
  // if (key==' '){
  //   mass=random(15,80);
  //   position.y=-mass;
  //   velocity.mult(0);
  // }
  if (key == " ") {
    if (!serialActive) {
      setUpSerial();
      console.log("serial")
    }
    mass=random(15,80);
    position.y=-mass;
    velocity.mult(0);
  }
}