#define PIN_RED   23  // GPIO23 connected to pin RED
#define PIN_GREEN 22  // GPIO22 connected to pin GREEN
#define PIN_BLUE  21  // GPIO21 connected to pin BLUE

void setup() {
  Serial.begin(115200);
  pinMode(PIN_RED, OUTPUT);
  pinMode(PIN_GREEN, OUTPUT);
  pinMode(PIN_BLUE, OUTPUT);
}

void loop() {
  // set color code #00C9CC (R = 0, G = 201, B = 204)
  setColor(0, 201, 204);

  delay(1000);  // keep the color 1 second

  // set color code #F7788A (R = 247, G = 120, B = 138)
  setColor(247, 120, 138);

  delay(1000); // keep the color 1 second

  // set color code #34A853 (R = 52,  G = 168, B = 83)
  setColor(52, 168, 83);

  delay(1000); // keep the color 1 second
}

// set color for RGB LED
void setColor(int R, int G, int B) {
  analogWrite(PIN_RED, R);
  analogWrite(PIN_GREEN, G);
  analogWrite(PIN_BLUE, B);
}