// RGB LED cycle through the colors of the rainbow
const int redPin = 15;   // GPIO 15 is connected to the red pin of the RGB LED
const int greenPin = 13; // GPIO 13 is connected to the green pin
const int bluePin = 12;  // GPIO 12 is connected to the blue pin

void setup() {
  // Set up the RGB pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  // Let's start with red
  setColor(255, 0, 0);  // Red
  delay(1000);

  // Then mix in some green to make orange
  setColor(255, 128, 0);  // Orange
  delay(1000);

  // Full green for yellow
  setColor(255, 255, 0);  // Yellow
  delay(1000);

  // Just green
  setColor(0, 255, 0);  // Green
  delay(1000);

  // Now blue
  setColor(0, 0, 255);  // Blue
  delay(1000);

  // Now Mixing blue and red for indigo
  setColor(75, 0, 130);  // Indigo
  delay(1000);

  // Finally, mixing of blue and red for violet
  setColor(148, 0, 211);  // Violet
  delay(1000);
}

// This function sets the color of the RGB LED
void setColor(int red, int green, int blue) {
  // We subtract from 255 to invert the logic if using a common anode RGB LED
  analogWrite(redPin, 255 - red);
  analogWrite(greenPin, 255 - green);
  analogWrite(bluePin, 255 - blue);
}