int ledPins[] = {2, 3, 4, 5, 6};
int Leds = 5;
int zpozdeni=1;

void setup() {
  //Preruseni
  attachInterrupt(digitalPinToInterrupt(19), preruseni, HIGH);
  for (int i = 0; i < Leds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}
void loop() {
  delay(200);
  //Rozsveceni
  for (int i = 0; i < Leds; i++) {
    for (int j = 0; j <= 255; j++) {
      analogWrite(ledPins[i], j);
      zpozdeni=analogRead(A0)/400; 
      delay(zpozdeni);
      } 
    
    if (i < Leds - 1) {
      //Zhasinani
      for (int j = 255; j >= 0; j--) {
        analogWrite(ledPins[i], j);
        zpozdeni=analogRead(A0)/400; 
        delay(zpozdeni);
      }
     } 
     
    if (i == Leds - 1) { 
      Leds--;
     } 
  }
}

void preruseni() {
  Leds=5;
  for (int a = 0; a < Leds; a++) {
    digitalWrite(ledPins[a], LOW);
    }  
}