void setup() {
  pinMode(4, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(17, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
 digitalWrite(4, HIGH); // put your main code here, to run repeatedly:
  delay(400); // this speeds up the simulation
  digitalWrite(4, LOW);
  delay(400);
  digitalWrite(2, HIGH); // put your main code here, to run repeatedly:
  delay(350); // this speeds up the simulation
  digitalWrite(2, LOW);
  delay(350);
  digitalWrite(16, HIGH); // put your main code here, to run repeatedly:
  delay(350); // this speeds up the simulation
  digitalWrite(16, LOW);
  delay(350);
  digitalWrite(17, HIGH);
  delay(350); // put your main code here, to run repeatedly:// this speeds up the simulation
  digitalWrite(17, LOW);
  delay(350);
  digitalWrite(19, HIGH);
  delay(350);
  digitalWrite(19, LOW);
  delay(350); 
  digitalWrite(18, HIGH);
  delay(350);
  digitalWrite(18, LOW);
  delay(350);
  
  
}