int nLED=5;      //number of LEDs
int LEDpin[]={8,9,11,12,13};   //LED pins
int reading,level;



void setup() {
 for (int i=0; i<5;i++) pinMode(LEDpin[i],OUTPUT);   //define LED pins as output

}

void loop() {
  reading=analogRead(A0);   // voltage divider reading
  level=0                   // set number of LEDs at zero
  level=map(reading,0,1023,0,nLEDs+1);  // map reading to level
  for (int i=0;i<nLEDs;i++){
                          
    if (i<level) digitalWrite(LEDpin[i],HIGH); //turn on LEDs less than level

    else digitalWrite(LEDpin[i],LOW);         // otherwise turn off
    }

    delay (1000);
}