Hi I really need solution quick

I'm trying to make a motion sensor alarm; when the webcam detects motion, the sound will alarm for few seconds and turns off.

I'm currently using my webcam as a motion detection, as well as using my arduino kit. I got the motion detection but here's the biggest problem. I want the sound to activate right as the webcam detects a motion.

Anyway here's my code

import ddf.minim.signals.*;
import ddf.minim.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;
import ddf.minim.*;
import processing.video.*;
import processing.serial.*;

Minim minim;
AudioPlayer groove;

Serial myPort;      // Create object from Serial class
Capture video;        // Create capture device from Video class
PImage prevFrame;     // Previous Frame ro compare with
float threshold = 10;  // How much change before the code reacts


int theswitch = 0;
int counter = 0;

void setup()
{
size(320, 240);
String portName = Serial.list()[0];
myPort = new Serial(this, portName, 9600);
video = new Capture(this, width, height, 15);

// Create an empty image the same size as the video
prevFrame = createImage(video.width,video.height,RGB);

 minim = new Minim(this);
 groove = minim.loadFile("Rods_and_Cones.mp3", 512);
 frameRate(75);
 noCursor();
 smooth();
}

void draw() {
background(0);

// You don't need to display it to analyze it!
image(video,0,0);

float motion = DetectMotion();
/*
if (motion > threshold) {
  theswitch = 1;
}

if(theswitch == 1) {
  counter++;
}

if(counter > 200) {
  theswitch = 0;
  counter = 0;
}*/

if (motion > threshold) {
  theswitch =1;
  counter = 0;
} else {
 if (counter > 150) {
  theswitch = 0;
 }
}
counter++;

if(theswitch == 1) {
  fill(204);
  myPort.write(1);
}
else {
  fill(0);
  myPort.write(0);
}
rect(50, 50, 100, 100);
}

// Test if anything in view moves
float DetectMotion() {

// Capture video
if (video.available()) {
  // Save previous frame for motion detection!!

prevFrame.copy(video,0,0,video.width,video.height,0,0,video.width,video.
height);
  prevFrame.updatePixels();
  video.read();
}

loadPixels();
video.loadPixels();
prevFrame.loadPixels();

// Begin loop to walk through every pixel
// Start with a total of 0
float totalMotion = 0;

// Sum the brightness of each pixel
for (int i = 0; i < video.pixels.length; i ++ ) {
  // Step 2, what is the current color
  color current = video.pixels[i];

  // Step 3, what is the previous color
  color previous = prevFrame.pixels[i];

  // Step 4, compare colors (previous vs. current)
  float r1 = red(current);
  float g1 = green(current);
  float b1 = blue(current);
  float r2 = red(previous);
  float g2 = green(previous);
  float b2 = blue(previous);

  // Motion for an individual pixel is the difference between the previous color and current color.
  float diff = dist(r1,g1,b1,r2,g2,b2);
  // totalMotion is the sum of all color differences.
  totalMotion += diff;
}

// averageMotion is total motion divided by the number of pixels analyzed.
float avgMotion = totalMotion / video.pixels.length;
return avgMotion;
}

void float(){
 if (groove.isPlaying()){
   groove.pause();
 } else {
   groove.play();
 }
}

void stop()
{
 groove.close();
 minim.stop();
 super.stop();
}

Please I need solution.