int redPin = 11;
int greenPin = 10;
int bluePin = 9;

int redPin2 = 6;
int greenPin2 = 5;
int bluePin2 = 3;

int r = 0;
int g = 0;
int b = 0;

int r2 = 0;
int g2 = 0;
int b2 = 0;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  pinMode(redPin2, OUTPUT);
  pinMode(greenPin2, OUTPUT);
  pinMode(bluePin2, OUTPUT);
}

void loop() {
  setColor(50, 0, 100);    // red
  setColor(40, 0, 70);    // green
  setColor(100, 0, 100);    // blue
  setColor(80, 0, 100);  // yellow
  setColor(0, 50, 100);    // purple
  setColor(100, 0, 50);  // aqua
  setColor(0,0,0);
  setColor2(50, 0, 100);    // red
  setColor2(40, 0, 70);    // green
  setColor2(100, 0, 100);    // blue
  setColor2(80, 0, 100);  // yellow
  setColor2(0, 50, 100);    // purple
  setColor2(100, 0, 50);  // aqua
  setColor(0,0,0);
  }

void setColor(int red, int green, int blue) {
  while ( r != red || g != green || b != blue ) {
    if ( r < red ) r += 1;
    if ( r > red ) r -= 1;

    if ( g < green ) g += 1;
    if ( g > green ) g -= 1;

    if ( b < blue ) b += 1;
    if ( b > blue ) b -= 1;

    _setColor();
    delay(70);
  }
}

void setColor2(int red2, int green2, int blue2) {
  while ( r2 != red2 || g2 != green2 || b2 != blue2 ) {
    if ( r2 < red2 ) r2 += 1;
    if ( r2 > red2 ) r2 -= 1;

    if ( g2 < green2 ) g2 += 1;
    if ( g2 > green2 ) g2 -= 1;

    if ( b2 < blue2 ) b2 += 1;
    if ( b2 > blue2 ) b2 -= 1;

    _setColor();
    delay(100);
  }
}

void _setColor() {
  analogWrite(redPin, r);
  analogWrite(greenPin, g);
  analogWrite(bluePin, b);

  analogWrite(redPin2, r2);
  analogWrite(greenPin2, g2);
  analogWrite(bluePin2, b2);
}