light dimmer Better

const int LedPin = 6;
const int ButtonPin = 12;
int ReadVal = 0;
int counter = 0;
void setup()

{
  pinMode (LedPin, OUTPUT);
  pinMode (ButtonPin, INPUT) ;
  Serial.begin(9600) ;

}

void loop()
{
  ReadVal = digitalRead(ButtonPin) ;
  Serial.println(ReadVal) ;
  if (ReadVal == 1 && counter == 0)
  {
    for (int i = 0; i < 200; i++)
    {
      analogWrite(LedPin, i);
      delay(20);
    }
    counter++;
  }
  else if (ReadVal == 1 && counter == 1)
  {
    for (int i = 200; i >= 0; i--)
    {
      analogWrite (LedPin, i);
      delay(20);
    }
    counter = 0;
  }

}