const int buttonPin = 2;   
const int redPin = 9;      
const int greenPin = 10;   
const int bluePin = 11;     

int buttonState = 0;      
int colorIndex = 0;       

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

void loop() {
 
  buttonState = digitalRead(buttonPin);

  
  if (buttonState == HIGH) {
   
    colorIndex = (colorIndex + 1) % 7; 
    
    
    switch (colorIndex) {
      case 0: 
        setColor(255, 0, 0);
        break;
      case 1:
        setColor(0, 255, 0);
        break;
      case 2: 
        setColor(0, 0, 255);
        break;
      case 3:
        setColor(0, 255, 255);
        break;
      case 4: 
        setColor(255, 0, 255);
        break;
      case 5: 
        setColor(255, 255, 0);
        break;
      case 6: 
        setColor(255, 255, 255);
        break;
    }
    
    
    delay(100);
  }
}


void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}