Pulse width modulation analog output example by adding led to arduino nano

PWM-LED.ino

int i = 0;
int j = 0;
const int W = 6;       // white, 2 white connected to same pin 

const int R2 = 3;      // red
const int R1 = 11;     // red

const int G1 = 10;     // green
const int G2 = 5;      // green

const int B = 9;       // blue

void setup() {
  pinMode(W, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(R1, OUTPUT);
  pinMode(R2, OUTPUT);
  pinMode(G1, OUTPUT);
  pinMode(G2, OUTPUT);
}

void loop() {
  int k = 5;
  for( j = 0; j < k; j++) {sequence();}
  delay(1000);
  for( j = 0; j < k; j++) {fadeIn();}
  delay(1000);
  for( j = 0; j < k; j++) {fadeInColor();}
  delay(1000);
  for( j = 0; j < k; j++) {rotate();}
  delay(1000);
  for( j = 0; j < k; j++) {oppSequence();}
  delay(1000);
}

void oppSequence() {
  for (int i = 0; i < 255; i++) {analogWrite(B, i);delay(1);}
  {
    for (int i = 0; i < 255; i++) {analogWrite(G1, i);analogWrite(G2, i);delay(1);} 
    {
      for (int i = 0; i < 255; i++) {analogWrite(R1, i);analogWrite(R2, i);delay(1);}
      {
        for (int i = 0; i < 255; i++) {analogWrite(W, i);delay(1);}
      }
    }
  }
  for (int i = 255; i >= 0; i--) {analogWrite(B, i);delay(1);}
  {
    for (int i = 255; i >= 0; i--) {analogWrite(G1, i);analogWrite(G2, i);delay(1);}
    {
      for (int i = 255; i >= 0; i--) {analogWrite(R1, i);analogWrite(R2, i);delay(1);}
      {
        for (int i = 255; i >= 0; i--) {analogWrite(W, i);delay(1);}
      }
    }
  }
}

void rotate() {
  digitalWrite(W, HIGH);
  for (int i = 0; i < 255; i++) {analogWrite(R2, 254-i);analogWrite(R1, i);delay(1);}
  {
    for (int i = 0; i < 255; i++) {analogWrite(R1, 254-i);analogWrite(G1, i);delay(1);}
    {
      for (int i = 0; i < 255; i++) {analogWrite(G1, 254-i);analogWrite(B, i);delay(1);}
      {
        for (int i = 0; i < 255; i++) {analogWrite(B, 254-i);analogWrite(G2, i);delay(1);}
        {
          for (int i = 0; i < 255; i++) {analogWrite(G2, 254-i);analogWrite(R2, i);delay(1);}
        }
      }
    }
  }
}

void fadeInColor() {
  for (int i = 0; i < 255; i++) { analogWrite(W, i);delay(1); }
  {
    for (int i = 0; i < 255; i++) {analogWrite(R1, i);analogWrite(R2, i);delay(1);}
    {
      for (int i = 0; i < 255; i++) {analogWrite(G1, i);analogWrite(G2, i);delay(1);}
      {
        for (int i = 0; i < 255; i++) {analogWrite(B, i);delay(1);}
      }
    }
  }

  for (int i = 255; i >= 0; i--) {analogWrite(B, i);delay(1);}
  {
    for (int i = 255; i >= 0; i--) {analogWrite(G1, i);analogWrite(G2, i);delay(1);}
    {
      for (int i = 255; i >= 0; i--) {analogWrite(R1, i);analogWrite(R2, i);delay(1);}
      {
        for (int i = 255; i >= 0; i--) {analogWrite(W, i);delay(1);}
      }
    }
  }
}

void fadeIn() {
  int pins[6] = { W, R1, G1, B, G2, R2 };
  for (int j = 0; j < 6; j++) {
    for (int i = 0; i < 255; i++) {analogWrite(pins[j], i);delay(1);}
    for (int i = 255; i >= 0; i--) {analogWrite(pins[j], i);delay(1);}
  }
}

void sequence() {
  int pins[7] = { W, R1, G1, B, G2, R2, W };
  for (int i = 0; i < 255; i++) {
    for (int j = 0; j < 7; j++) {
      analogWrite(pins[j], i);
    }
    delay(3);
  }
  for (int i = 255; i >= 0; i--) {
    for (int j = 0; j < 7; j++) {
      analogWrite(pins[j], i);
    }
    delay(3);
  }
}