int8_t piny[]={2,3,4,5,6,7,8,9,10,11};
int8_t pocet_pinov=sizeof(piny)/sizeof(int8_t);
int rychlost;
int i=0;
int k=-1;
void setup() {
  for(int i=0;i<pocet_pinov;i++){
    pinMode(piny[i], OUTPUT);
  }
  Serial.begin(9600);
  Serial.println(pocet_pinov);
}

void loop() {
  rychlost=map(analogRead(A0),0,1023,50,1000);
  Serial.println(rychlost);

    i=(i>=10?0:i);
    k=(i==0||i==10?-k:k);
    delay(rychlost);
    digitalWrite(piny[i], HIGH);
    //delay(rychlost);
    
    digitalWrite(piny[i], LOW);
    //delay(rychlost);
  /*for(int i=pocet_pinov-1;i>=0;i--){
    //digitalWrite(piny[i], HIGH);
    //delay(100);
    //rychlost=map(analogRead(A0),0,1023,50,1000);
    digitalWrite(piny[i], LOW);
    delay(rychlost);
  }*/
}