#include <SoftwareSerial.h>
SoftwareSerial mySerial(5, 6); // RX, TX

const int buttonPin = 0;     // the number of the pushbutton pin

// pins for the LEDs:
const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;

void setup() {

  //mySerial.begin(9600);

  pinMode(redPin, OUTPUT); 
  pinMode(greenPin, OUTPUT); 
  pinMode(bluePin, OUTPUT); 

}

void loop() {
  // if there's any serial available, read it:
  while (mySerial.available() > 0) {

    // look for the next valid integer in the incoming serial stream:
    int red = mySerial.parseInt(); 
    // do it again:
    int green = mySerial.parseInt(); 
    // do it again:
    int blue = mySerial.parseInt(); 

    // look for the newline. That's the end of your
    // sentence:
    if (mySerial.read() == '\n') {
      // constrain the values to 0 - 255 and invert
      // if you're using a common-cathode LED, just use "constrain(color, 0, 255);"
      red = 255 - constrain(red, 0, 255);
      green = 255 - constrain(green, 0, 255);
      blue = 255 - constrain(blue, 0, 255);

      // fade the red, green, and blue legs of the LED: 
      digitalWrite(redPin, red);
      digitalWrite(greenPin, green);
      digitalWrite(bluePin, blue);
      
      mySerial.println("1");
    }
  }
}