int redLED = 9;
int greenLED = 5;
int blueLED = 1; // НЕ ШИМ
 
void setup() 
{
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
}

void loop()
{
  digitalWrite(redLED, HIGH); 
  delay(500);
  digitalWrite(redLED, LOW);
  delay(500);

  digitalWrite(greenLED, HIGH); 
  delay(500);
  digitalWrite(greenLED, LOW);
  delay(500);

  digitalWrite(blueLED, HIGH); 
  delay(500);
  digitalWrite(blueLED, LOW);
  delay(500);

  for (int i = 0; i < 255; i++)
  {    
     colorRGB(i, 0, 0); // плавное увеличение яркости синего цвета с 0 до максимума - 255  
     delay(20);
  }

  delay(500);
}

void colorRGB(int red, int green, int blue)
{
    analogWrite(redLED, red);
    analogWrite(greenLED, green);
    analogWrite(blueLED, blue);
}