LED_Flow.c

const int DELAY = 100;
int LEDS[] = {11, 10, 9, 6, 5, 3};
const int LEDS_COUNT = 6;

void setup() {
  Serial.begin(9600);
  
  for(int i=0; i<LEDS_COUNT; i++) {
   pinMode(LEDS[i], OUTPUT);
  }

  pinMode(2, INPUT);
}

int lol = 0;

void loop() {

  int reading = digitalRead(2);
  Serial.println(reading);
  
  if(reading == 1) {
    lol++;
  } else {
    lol = 0;
  }


  if(lol > 20) {
    Serial.println("\n\n\nactivating");
    for(int i=0; i<LEDS_COUNT; i++) {
      int prev = i-1;
      if(prev < 0) {
        prev = LEDS_COUNT-1;
      }
      digitalWrite(LEDS[prev], LOW);
      digitalWrite(LEDS[i], HIGH);
      delay(100);
    }
    digitalWrite(LEDS[5], LOW);
    lol = 0;
  }
}