int enable2=9;
int in3=10;
int in4=11;
int swPin=2;
int ledPin=13;
int swState=0;

void setup()
{
  pinMode(enable2,OUTPUT);
  pinMode(in3,OUTPUT);
  pinMode(in4,OUTPUT);
  pinMode(ledPin,OUTPUT);
  pinMode(swPin,INPUT);

}
void loop()
{
  swState=digitalRead(swPin);
  if(swState==HIGH)                       //stage 1
  {
     digitalWrite(ledPin,HIGH);
     analogWrite(enable2,255);               //any value between 0 and 255
     digitalWrite(in3,HIGH);                  //stage 1
     digitalWrite(in4,LOW);
     delay(10000);
     digitalWrite(in3,LOW);                    //stage 2
     digitalWrite(in4,LOW);
     delay(1000);
     analogWrite(enable2,150);                 //any value between 0 and 255
     digitalWrite(in3, LOW);                  // stage 3
     digitalWrite(in4,HIGH);
     delay(3000);
     digitalWrite(in3,LOW);                 //stage 4
     digitalWrite(in4,LOW);
     delay(1000);
     analogWrite(enable2,200);               //any vlaue between 0 and 255
     digitalWrite(in3,LOW);                   //stage 5
     digitalWrite(in4,HIGH);
     delay(7000);
     digitalWrite(in3,LOW);                 //stage 6
     digitalWrite(in4,LOW);
     delay(1000);
        }
  else
        {
    digitalWrite(ledPin,LOW);        //stage 7
    digitalWrite(in3,LOW);
    digitalWrite(in4,LOW);
    delay(1000);
  }
}