int leds[10] = {13, 12, 11, 10, 9, 8, 7, 6, 5, 4};
int pot_pin = A0;
int led_balandlik;
int pot_qiymat;

void sample1() {
  for(int i=0; i<10; i++) {
    digitalWrite(leds[i], HIGH);
    delay(500);
  }

  for(int i=9; i>=0; i--) {
    digitalWrite(leds[i], LOW);
    delay(500);
  }
}

void setup() {
 for(int i=0; i<10; i++) {
  pinMode(leds[i], OUTPUT);
 }

 Serial.begin(9600);
}

void loop() {
  pot_qiymat = analogRead(pot_pin);
  Serial.println(pot_qiymat);

  led_balandlik = map(pot_qiymat, 0, 1023, 0, 10);

  for(int i=0; i<led_balandlik; i++) {
    digitalWrite(leds[i], HIGH);
  }

  for(int i=led_balandlik; i<10; i++) {
    digitalWrite(leds[i], LOW);
  }
}