#include <Servo.h>
Servo myservo;
int pos = 0;
void setup(){
  myservo.attach(9);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}
void loop(){
  for (pos = 0; pos <= 180; pos += 1){
    if(pos==0){digitalWrite(11, HIGH);}else{digitalWrite(11, LOW);}
    if(pos==90){digitalWrite(12, HIGH);}else{digitalWrite(12, LOW);}
    if(pos==180){digitalWrite(13, HIGH);}else{digitalWrite(13, LOW);} 
     myservo.write(pos);
    delay(10);
  }
  for (pos = 180; pos >= 0; pos -= 1){
     if(pos==0){digitalWrite(11, HIGH);}else{digitalWrite(11, LOW);}
    if(pos==90){digitalWrite(12, HIGH);}else{digitalWrite(12, LOW);}
    if(pos==180){digitalWrite(13, HIGH);}else{digitalWrite(13, LOW);} 
   myservo.write(pos);
   delay(10); 
  }
}