//https://www.artem.ru/cgi-bin/news?c=v&id=737&ysclid=lt1q5to3ii516726430
//https://arduinoplus.ru/74hc595-arduino/?ysclid=lt1psysbys817081605
//https://arduino.ru/forum/programmirovanie/programmnyi-shim-na-sdvigovom-registre?ysclid=lt1qdmqg8u699016855
int latchPin = 8;
int clockPin = 12;
int dataPin = 11;
byte leds = 0;
int currentLED = 0;

void setup()
{
    pinMode(latchPin, OUTPUT);
    pinMode(dataPin, OUTPUT);
    pinMode(clockPin, OUTPUT);
    pinMode(2, INPUT_PULLUP);

    leds = 0;
}

void loop()
{
  bool btnState = digitalRead(2);
  if (btnState==0)
  {
     LEDpush();
      if (currentLED == 7)
    {
        currentLED = 0;
    }
    else
    {
        currentLED++;
    }
  }
    delay(80);

}


void LEDpush()
{
      bitSet(leds, currentLED);

    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, leds);
    digitalWrite(latchPin, HIGH);

}