#include "Servo.h"  //Library for the servo object and PWM function
Servo blue_servo;   //Name your servo
int angle = 0;      //Save the position
void setup() {
  blue_servo.attach(6);     //Place of the servo
  blue_servo.write(angle);  //Return to 0
}
void loop() {
  // move in little steps of 1° until reaching the end
  for (angle = 0; angle < 180; angle++) {
    blue_servo.write(angle);
    //add a delay to wait for the servo to arrive
    //add more time when moving more distance
    delay(15);
  }
  // move back in little steps of 1°
  for (angle = 180; angle > 10; angle--) {
    blue_servo.write(angle);
    delay(15);
  }
}