从处理到Arduino获得3个值

我在Processing中有一个颜色跟踪程序，它与Kinect一起使用 . 当我单击图片中的某个位置时，它会保存此颜色并在其周围绘制一个椭圆 . 我只想在myPort.write（）上将3个int值（一个用于红色，绿色和蓝色）发送到Arduino，并将这三个值保存在Arduino中的2个变量中 . 我的目标是在红色变量最高的情况下点亮红色LED，如果绿色最高则点亮绿色LED，依此类推 .

我已经尝试了几个我用谷歌搜索发现的例子，但没有任何作用 . 我不知道Arduino应该如何在变量中获得正确的值！

编辑：这里有我的处理代码 . 我从其他几个教程中将它粘在一起，直到我几乎哭了..

import processing.serial.*;
Serial myPort;

import SimpleOpenNI.*;

SimpleOpenNI kinect;
// Frame
PImage currentFrame;
color trackColor;

int r1, g1, b1, r2, g2, b2;


void setup()
{
  size(640, 480);

  String portName = Serial.list()[0]; //change the 0 to a 1 or 2 etc. to match your port
  myPort = new Serial(this, portName, 9600);

  kinect = new SimpleOpenNI(this);
  kinect.enableRGB();

  trackColor = color (255, 0, 0);
  smooth ();

  currentFrame = createImage (640, 480, RGB);
}

void draw()
{
  kinect.update();

  currentFrame = kinect.rgbImage ();
  image(currentFrame, 0, 0);

  currentFrame.loadPixels();

  // Before we begin searching, the "world record" for closest color is set to a high number that is easy for the first pixel to beat.
  float worldRecord = 500;

  // XY coordinate of closest color
  int closestX = 0;
  int closestY = 0;

  // Begin loop to walk through every pixel
  for (int x = 0; x < currentFrame.width; x ++ ) {
    for (int y = 0; y < currentFrame.height; y ++ ) {
      int loc = x + y*currentFrame.width;
      // What is current color
      color currentColor = currentFrame.pixels[loc];
      r1 = (int)red(currentColor);
      g1 = (int)green(currentColor);
      b1 = (int)blue(currentColor);
      r2 = (int)red(trackColor);
      g2 = (int)green(trackColor);
      b2 = (int)blue(trackColor);

      // Using euclidean distance to compare colors
      float d = dist(r1, g1, b1, r2, g2, b2); // We are using the dist( ) function to compare the current color with the color we are tracking.

      // If current color is more similar to tracked color than
      // closest color, save current location and current difference
      if (d < worldRecord) {
        worldRecord = d;
        closestX = x;
        closestY = y;
      }
    }
  }

  // We only consider the color found if its color distance is less than 10.
  // This threshold of 10 is arbitrary and you can adjust this number depending on how accurate you require the tracking to be.
  if (worldRecord < 10) {
    // Draw a circle at the tracked pixel
    fill(trackColor);
    strokeWeight(4.0);
    stroke(0);
    ellipse(closestX, closestY, 30, 30);
  }




  if (mousePressed == true) {
    color c = get(mouseX, mouseY);
    //println("r: " + red(c) + " g: " + green(c) + " b: " + blue(c));

    // Save color where the mouse is clicked in trackColor variable
    int loc = mouseX + mouseY*(currentFrame.width);

    trackColor = currentFrame.pixels[loc];

 println("red " + r2);
 println("green " + g2);
 println("blue " + b2);

 int colors[] = {r2, g2, b2};

 for(int i=0; i < 3; i++) {
   myPort.write(colors[i]); 
 }

} 
 println("ClosestX " + closestX);
  myPort.write(closestX);
}

还有我的Arduino代码，我不知道如何获得多个值 .

int val;
int ledPin = 13;
int freq;
int piezoPin = 9;

int redLED = 3;
int greenLED = 5;
int blueLED = 7;

int red, green, blue;

void setup() {
  pinMode(ledPin, OUTPUT); // Set pin as OUTPUT
  Serial.begin(9600); // Start serial communication at 9600 bps

  digitalWrite(ledPin, LOW);
}

void loop() {
  if (Serial.available() > 0)
  { // If data is available to read,
    val = Serial.read(); // read it and store it in val
}

 if(red > green && red > blue) {
 digitalWrite(redLED, HIGH); //light Red LED
 }

  if(green > red && green > blue) {
 digitalWrite(greenLED, HIGH); //light Red LED
 }

 if(blue > red && blue > green) {
 digitalWrite(blueLED, HIGH); //light Red LED
 }


  //Piezo buzzing higher when X-Position of tracked color is higher. 
  if (val < 100) {
    freq = 50;
  }
  else if (val < 200) {
    freq = 200;
  }
  else if (val < 300) {
    freq = 400;
  }
  else if (val < 400) {
    freq = 600;
  }
  else if (val < 500) {
    freq = 800;    
  }
  else (freq = 1000); 

  tone(piezoPin, freq);

}

EDIT2：是的，除了点亮LED之外，我还希望从压电蜂鸣器发出声音，但效果非常好，所以对此没有任何疑问 .

请帮忙！！