// Include the Servo library to control the servo motor.
#include <Servo.h>
					
						// Create a servo object named myServo for controlling a servo.
						Servo myServo;  
					
						// Attach the servo on pin 9 to the servo object for PWM control.
						void setup() {
						  myServo.attach(9);  
						}
					
						// Move the servo from 0 to 180 degrees
						void loop() {
						  // Goes from 0 degrees to 180 degrees
						  for(int angle = 0; angle <= 180; angle += 1) { 
							myServo.write(angle);              // Tell the servo to go to the position in angle.
							delay(15);                         // Wait 15ms between each position to slow down the movement.
						  }
						  
						  // Move the servo from 180 to 0 degrees
						  for(int angle = 180; angle >= 0; angle -= 1) { // Goes from 180 degrees back to 0 degrees
							myServo.write(angle);              // Tell the servo to go to the position in angle.
							delay(15);                         // Wait 15ms between each position to slow down the movement.
						  }
						}