/* Pin initialization, setting up pins 3, 5, 6 for connecting the anode of RGB
LED, use any PWM pin to connect the anode of RGB but have to mention the correct pin
number to initialize it for connecting it  anode for RGB LED "Analog pins can also be used instead of PWM pins in digital side"
the PWM pins in the digital i/o side will be marked with a symbol '~' */
const int RGB_red=3;
const int RGB_green=5;
const int RGB_blue=6;

/* Initializing three empty variables to store the RGB value received from the Serial communication */
int red=0;
int green=0;
int blue=0;

void setup()
{
    Serial.begin(9600);             //Begin the serial communication
    pinMode(RGB_red, OUTPUT);       //Initialize RGB_red pin as output
    pinMode(RGB_green, OUTPUT);     //Initialize RGB_green pin as output
    pinMode(RGB_blue, OUTPUT);      //Initialize RGB_blue pin as output
  }

void loop()
{
        while(Serial.available()>0)           // Until data is present in serial port this "while" statement executes
        {
            red=Serial.parseInt();            // detect and store the first longest variable
            green=Serial.parseInt();          // detect and store the first longest variable 
            blue=Serial.parseInt();           // detect and store the first longest variable
            Serial.print(red);
            Serial.print(green);
            Serial.print(blue);
            if(Serial.read()!='\n')
            {
                red=255-constrain(red, 0, 255);       // Include this code if your LED is Common Cathode
                green=255-constrain(green, 0, 255);   // Include this code if your LED is Common Cathode
                blue=255-constrain(blue, 0, 255);     // Include this code if your LED is common Cathode
                analogWrite(RGB_red, red);
                analogWrite(RGB_green, green);
                analogWrite(RGB_blue, blue);
              }
      }
}