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#include <Servo.h>
  
Servo myservo;

int pos = 0;

   
// variable to store the servo position
 
void setup()

{

  myservo.attach(7);

 
}
 
void loop()

{

  for(pos = 0; pos <= 180; pos++)
  {

                               
    myservo.write(pos);

           
    delay(50);

                    
  }

  for(pos = 180; pos >= 0; pos--)  
  

{                               
    

myservo.write(pos);

           
    delay(50);

                    
  }

}