const int buttonPin = 13;
int buttonState = HIGH;
int redPin = 9;
int greenPin = 10;
int bluePin = 11;
void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}
void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState == LOW) 
  {
  setColor(255, 0, 0);
  delay(500);
  }
  if (buttonState == HIGH)
  setColor(0, 255, 0);
  delay(500); 
}
void setColor(int red, int green, int blue) {
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}