#include <Servo.h>
Servo servo1;
void setup() 
{
  servo1.attach(3);
  }
  void loop() 
  {
    servo1.write(0);
      delay(2500);
      servo1.write(45);
      delay(2500);
      servo1.write(90);
      delay(2500);
      servo1. write(135);
      delay(2500);
      servo1. write(180);
      delay(2500);
      servo1. write(135);
      delay(2500);
      servo1. write(90);
      delay(2500);
      servo1. write(45);
      delay(2500);
      servo1. write(0);
  }