int datapin = 13;
int clockpin = 15;
int latchpin  = 14;

byte data = 0;

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

  pinMode(datapin, OUTPUT);
  pinMode(clockpin, OUTPUT);
  pinMode(latchpin, OUTPUT);
}

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

void shiftWrite(int desiredPin, boolean desiredState){

    bitWrite(data, desiredPin, desiredState);

    shiftOut(datapin, clockpin, MSBFIRST, data);

    digitalWrite(latchpin, HIGH);
    digitalWrite(latchpin, LOW);
}

void oneAfterAnother(){
  int index;
  int delayTime = 10000;

  shiftWrite(index, HIGH);
  delay(delayTime);
  shiftWrite(index, LOW);
  delay(delayTime);
  shiftWrite(index+1, HIGH);
  shiftWrite(index+2, HIGH);

/*
  for(index = 0; index <= 7; index++){
    shiftWrite(index, HIGH);
    delay(delayTime);
  }

 for(index = 7; index >= 0; index--){
    shiftWrite(index, LOW);
    delay(delayTime);
  }
  */
}