int pot1;
int pot2;

void stepper(int p)
{
    digitalWrite(8, LOW);
    delay(map(p,0,1023,50,0));
    digitalWrite(8, HIGH);
    delay(map(p,0,1023,50,0));
    digitalWrite(8, LOW);
}
void setup() 
{
  pinMode(7, OUTPUT);   
  pinMode(8, OUTPUT);   
  Serial.begin(9600);   
  digitalWrite(7, HIGH);  
}

void loop() 
{
  pot1 = analogRead(A0);  
  delay(500);
  pot2 = analogRead(A0);  
  Serial.print("pot1: ");
  Serial.println(pot1);
  delay(500);
  Serial.print("pot2: ");
  Serial.println(pot2);
  delay(500);
  if (pot1==0 && pot2==0) 
  {
     digitalWrite(8,LOW);
  }
  else if(pot1==pot2){
    stepper(pot1);
  }
}