#define LED_PIN 2
#define BUTTON_PIN 13

#define PIN_RED    23 // GPIO23
#define PIN_GREEN  22 // GPIO22
#define PIN_BLUE   21 // GPIO21

int led_state = LOW;    // the current state of LED
int button_state;       // the current state of button
int last_button_state;  // the previous state of button

void setup() {
  Serial.begin(9600);

  pinMode(LED_PIN, OUTPUT);

  pinMode(PIN_RED,   OUTPUT);
  pinMode(PIN_GREEN, OUTPUT);
  pinMode(PIN_BLUE,  OUTPUT);

  // initialize the pushbutton pin as an pull-up input
  pinMode(BUTTON_PIN, INPUT_PULLUP);

  button_state = digitalRead(BUTTON_PIN);
}

void loop() {
  last_button_state = button_state;      // save the last state
  button_state = digitalRead(BUTTON_PIN); // read new state

  if (last_button_state == HIGH && button_state == LOW) {
    Serial.println("The button is pressed");

    // toggle state of LED
    led_state = !led_state;

    // control LED arccoding to the toggled state
    digitalWrite(LED_PIN, led_state);

    Serial.println("Flashing RGB...");
    // color code #00C9CC (R = 0,   G = 201, B = 204)
    setColor(0, 201, 204);
    delay(1000); // keep the color 1 second
    // color code #F7788A (R = 247, G = 120, B = 138)
    setColor(247, 120, 138);
    delay(1000); // keep the color 1 second
    // color code #34A853 (R = 52,  G = 168, B = 83)
    setColor(52, 168, 83);
    delay(1000); // keep the color 1 second
    Serial.println("Done");
  }

  //digitalWrite(LED, HIGH);
  //delay(500);
  //digitalWrite(LED, LOW);
  //delay(500);
}

void setColor(int R, int G, int B) {
  analogWrite(PIN_RED,   R);
  analogWrite(PIN_GREEN, G);
  analogWrite(PIN_BLUE,  B);
}