int redPin = 9;   // 紅色引腳接在D12

int greenPin = 10; // 綠色引腳接在D10

int bluePin = 11;  // 藍色引腳接在D11

void setup() {

  pinMode(redPin, OUTPUT);

  pinMode(greenPin, OUTPUT);

  pinMode(bluePin, OUTPUT);

}

void loop() {

  for (int color = 0; color <= 255; color++) {

    // 紅色漸變至綠色

    setRGBColor(color, 255 - color, 0);

    delay(10);

  }

  for (int color = 0; color <= 255; color++) {

    // 綠色漸變至藍色

    setRGBColor(0, color, 255 - color);

    delay(10);

  }

  for (int color = 0; color <= 255; color++) {

    // 藍色漸變至紅色

    setRGBColor(255 - color, 0, color);

    delay(10);

  }

}

void setRGBColor(int red, int green, int blue) {

  analogWrite(redPin, red);

  analogWrite(greenPin, green);

  analogWrite(bluePin, blue);