int PotPin = A0; 
int sensorValue = 0;
const int numLED = 8;
const int pinLED[numLED] = {2,3,4,5,6,7,8,9};
void setup() 
{  
  for(int i=0; i<8; i++)
	{
	pinMode(pinLED[i], OUTPUT);
	}
}

void loop() 
{
  sensorValue = analogRead(PotPin);
	for(int i=0; i<8; i++)
	{
	digitalWrite(pinLED[i], HIGH);
	delay(sensorValue);
	}
  for(int i=7; i>=0; i--)
	{
	digitalWrite(pinLED[i], LOW);
	delay(sensorValue);
	}
}