int a=27;
int b=22;
int c=26;
int d=19;
int e=25;
int f=18;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(a, HIGH);
  delay(1000);
  digitalWrite(a, LOW);
  delay(1000);
  digitalWrite(b, HIGH);
  delay(1000);
  digitalWrite(b, LOW);
  delay(1000);
  digitalWrite(c, HIGH);
  delay(1000);
  digitalWrite(c, LOW);
  delay(1000);
  digitalWrite(d, HIGH);
  delay(1000);
  digitalWrite(d, LOW);
  delay(1000);
  digitalWrite(e, HIGH);
  delay(1000);
  digitalWrite(e, LOW);
  delay(1000);
  digitalWrite(f, HIGH);
  delay(1000);
  digitalWrite(f, LOW);
  delay(1000); // this speeds up the simulation
}