int pot = 0;
int i = 0;

void setup() 
{
  Serial.begin(9600);
  for (i=2;i<12;i++)
  { 
    pinMode ( i, OUTPUT );
  }
    pinMode ( A0, INPUT );
}

void loop ( ) 
{
pot = analogRead ( A0 );
pot = map ( pot, 0, 1023 , 2, 11);
Serial.println(pot);
  for (i=2;i<12;i++)
  { 
    digitalWrite ( i, LOW );
  }

digitalWrite ( pot,  HIGH);

}