int mot1 = 8;
int mot2 = 9;
int en1 = 10;
int dir = 6;
bool state = true;
int nob = A0;
int val=0;



void setup()
{
  pinMode(mot1,OUTPUT);
  pinMode(mot2,OUTPUT);
  pinMode(en1,OUTPUT);
  pinMode(dir,INPUT_PULLUP);

}

void loop()
{

  val = analogRead(nob);

  analogWrite(en1, val / 4);

  if(digitalRead(dir)==LOW)
  {
     state=!state;
     while(dir==LOW);
     delay(300);
  }
  if(state)
  {
    digitalWrite(mot1,HIGH);
    digitalWrite(mot2,LOW);
  }
  else
  {
    digitalWrite(mot1,LOW);
    digitalWrite(mot2,HIGH);
  }


}