#define latchPin 21
#define clkPin 22
#define dataPin 19


unsigned char C[] = {B00000000,B00011110,B00100000,B01000000,B01000000,B01000000,B00100000,B00011110};

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

  digitalWrite(latchPin, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  
  for(int i=7; i>=0; i--){
    byte aa = B11111111;
    shiftOut(dataPin, clkPin, MSBFIRST,  C[7-i]);
    shiftOut(dataPin, clkPin, MSBFIRST,  bitClear(aa, i));
    digitalWrite(latchPin, HIGH);
    digitalWrite(latchPin, LOW);
  }
}