Webcam controlled fan

A simple interface to switch a circuit with a webcam (no direct use at all)

Processing is 'controlling' the webcam, when key-c is pressed a picture is taken and the 'dark pixels' are counted. When more then 11000 dark pixels, a serial signal is send to the Arduino who switches the tranistor to low. When key-r is pressed, the Arduino gets a signal and the transistor is switched high again.

Arduino sketch:

int pin12 = 12;

int numReceived;

void setup(){

  Serial.begin(9600);

  pinMode(pin12, OUTPUT);

  digitalWrite(pin12, HIGH);

}

void loop(){

  if (Serial.available() > 0){

    numReceived = Serial.read();

  }

  if (numReceived == 125){

    digitalWrite(pin12, LOW);

  } else {

    digitalWrite(pin12, HIGH);

  }

}

Processing sketch:

import processing.video.*;

import processing.serial.*;

Capture cam;

PImage img;

color pixelColor;

Serial myPort;

void setup() {

  size(640, 480, P3D);

  myPort = new Serial(this, Serial.list()[0], 9600);

  String[] cameras = Capture.list();

  

  if (cameras.length == 0) {

    println("There are no cameras available for capture.");

    exit();

  } else {

    println("Available cameras:");

    for (int i = 0; i < cameras.length; i++) {

      println(cameras[i]);

    }

    println("Press c to capture || Press r restart");

    

    // The camera can be initialized directly using an 

    // element from the array returned by list():

    cam = new Capture(this, cameras[1]);

    cam.start();

  }  

}

void draw() {

  if (cam.available() == true) {

    cam.read();  

  }

  image(cam, 0, 0);

}

void keyPressed(){

  if (key == 'r' || key == 'R'){

    cam.start();

    loop();

    int restart = 0;

    myPort.write(restart);

  }

  

  if (key == 'c' || key == 'C') {

    noLoop();

    img = get (0, 0, width, height);

    color dark = color(30, 30, 30);

    color black = color(0, 0, 0);

    color white = color(255, 255, 255);

    color pixelColor;

    int countDark = 0;

    int dimension = width * height;

    img.loadPixels();

    for (int i = 0; i < dimension; i ++) {

      pixelColor = img.pixels[i];

      if (pixelColor <= dark){

        img.pixels[i] = black;

        countDark++;

      } else {

        img.pixels[i] = white;

      }

    }

    img.updatePixels();

    img.save("test");

    cam.stop();

    PImage photo = loadImage("test.tif");

    image(photo, 0, 0);

    println("Dark: "+countDark);

    if (countDark > 11000){

      int stop = 125;

      myPort.write(stop);

      println("byte:"+stop);

    }      

  }

}