void setup() {
  // put your setup code here, to run once:
  for(int i = 2, i <= 7; i++){
    pinMode(i, OUTPUT)
  }
  pinMode(A0, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  mapPot = map(analogRead(A0), 0, 1023, 1, 6);

  for(int i = 2, i <= 7, i++){
    digitalWrite(i, LOW);
  }

  switch(mapPot){
    case 6;
      digitalWrite(7, HIGH);
    case 5;
      digitalWrite(6, HIGH);
      case 4;
      digitalWrite(5, HIGH);
    case 3;
      digitalWrite(4, HIGH);
    case 2;
      digitalWrite(3, HIGH);
    case 1;
      digitalWrite(2, HIGH);
  }

}