int LEDR = 15;
int LEDW = 2;
int LEDY = 4;
int LEDB = 5;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
  pinMode(LEDR, OUTPUT);
  pinMode(LEDW, OUTPUT);
  pinMode(LEDY, OUTPUT);
  pinMode(LEDB, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LEDB , HIGH);
  delay(500);
  digitalWrite(LEDB , LOW);
  delay(500);  

  digitalWrite(LEDY , HIGH);
  delay(500);
  digitalWrite(LEDY , LOW);
  delay(500);
  
  digitalWrite(LEDW , HIGH);
  delay(500);
  digitalWrite(LEDW , LOW);
  delay(500);

  digitalWrite(LEDR , HIGH);
  delay(500);
  digitalWrite(LEDR , LOW);
  delay(500);

}