Week 11 | Serial Communication: Serial Communication Exercises Assignment

Serial Communication Exercises Assignment:

Exercise (1) make something that uses only one sensor  on Arduino and makes the ellipse in p5 move on the horizontal axis, in the middle of the screen, and nothing on arduino is controlled by p5

ellipse(map(alpha, 0, 1023, 0, 640), 80, 80, 80);

Video Demonstration IMG_5539 2

Exercise (2) make something that controls the LED brightness from p5

function keyPressed() {
  
  // set up connection with p5:
  if (key == " ") {
    setUpSerial();
  }
  
  if (key == "1"){
    left = 10;
  }
  
  if (key == "2"){
    left = 100;
  }
  
  if(key == "3"){
    left = 255;
  }
}

Video DemonstrationIMG_5542

Exercise (3) take the gravity wind example  and make it so every time the ball bounces one led lights up and then turns off, and you can control the wind from one analog sensor

P5 CODE

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);

  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 = 5;
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);
}

Video Demonstration IMG_5610