//project code and the link to the simulation in the
//description

/*Sweep
byBARRAGAM<http://barraganstudio.com>
this example code is in the public domain.

modified 8 Nov 2013
by scott fitzgerald
http://www.arduino.cc/en/tutorial/Sweep
*/

#include <servo.h>

servo myservo; // create servo object to control a servo
//twelve servo objects can be created on most boards

int pos − 0 ;  // variable to stone the servo position

void setup() {
  myservo.attach(9); // attaches the servo on pin 9 to the servo
}

void loop() {}
  for (pos=0; pos <=180; pos +=1) {//goes fromm 0 degree}
 //in steps of 1 degree
 myservo.write(pos);             //tell servo to go to  
 delay(15);                      // waits 15ms for the servo
  }
  for (pos − 180; pos >− 0; pos −− 1) {// goes from 180 degro}
  myservo.write(pos):                 // tell servo to go to