const int RED_PIN = 0;
const int GREEN_PIN = 1;
const int BLUE_PIN = 2;


int DISPLAY_TIME = 100;  


void setup()
{
  

  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}


void loop()
{
  
  mainColors();
  
 
  showSpectrum();
}



void mainColors()
{
  

  digitalWrite(RED_PIN, LOW);
  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  

  digitalWrite(RED_PIN, HIGH);
  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  
  digitalWrite(RED_PIN, LOW);
  digitalWrite(GREEN_PIN, HIGH);
  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

 

  digitalWrite(RED_PIN, LOW);
  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

 
  digitalWrite(RED_PIN, HIGH);
  digitalWrite(GREEN_PIN, HIGH);
  digitalWrite(BLUE_PIN, LOW);

  delay(1000);

  
  digitalWrite(RED_PIN, LOW);
  digitalWrite(GREEN_PIN, HIGH);
  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

  

  digitalWrite(RED_PIN, HIGH);
  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);

  

  digitalWrite(RED_PIN, HIGH);
  digitalWrite(GREEN_PIN, HIGH);
  digitalWrite(BLUE_PIN, HIGH);

  delay(1000);
}







void showSpectrum()
{
  int x;  

  for (x = 0; x < 768; x++)

  

  {
    showRGB(x);  
    delay(10);   
  }
}






void showRGB(int color)
{
  int redIntensity;
  int greenIntensity;
  int blueIntensity;

  

  if (color <= 255)         
  {
    redIntensity = 255 - color;    
    greenIntensity = color;        
    blueIntensity = 0;            
  }
  else if (color <= 511)    
  {
    redIntensity = 0;                    
    greenIntensity = 255 - (color - 256); 
    blueIntensity = (color - 256);        
  }
  else   
  {
    redIntensity = (color - 512);         
    greenIntensity = 0;                   
    blueIntensity = 255 - (color - 512);  
  }

  

  analogWrite(RED_PIN, redIntensity);
  analogWrite(BLUE_PIN, blueIntensity);
  analogWrite(GREEN_PIN, greenIntensity);
}