int merah = 21;
int hijau = 22;
int biru = 23;
int angka = 4;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(merah, OUTPUT);
  pinMode(hijau, OUTPUT);
  pinMode(biru, OUTPUT);

  /*digitalWrite(merah, HIGH);
  digitalWrite(biru, HIGH);
  digitalWrite(hijau, HIGH);*/

  while(angka>=0){
    RGB(1,0,0);
    delay(500);
    RGB(0,1,0);
    delay(500);
    RGB(0,0,1);
    delay(500);
    RGB(1,1,0);
    delay(500);
    RGB(1,0,1);
    delay(500);
    RGB(0,1,1);
    delay(500);
    RGB(1,1,1);
    delay(500);
    Serial.println(angka);
    angka--;
  }
  RGB(0,0,0);
  delay(500);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}

void RGB(bool pinmerah, bool pinhijau, bool pinbiru){
  digitalWrite(merah, pinmerah);
  digitalWrite(biru, pinbiru);
  digitalWrite(hijau, pinhijau);
}