#include <Servo.h> // Include the Servo library

Servo myServo; // Create a Servo object

void setup() {
  myServo.attach(9); // Attach the Servo control pin to digital pin 9
}

void loop() {
  // Sweep the servo from 0 to 180 degrees
  for (int pos = 0; pos <= 180; pos += 1) { // Goes from 0 to 180 degrees
    myServo.write(pos); // Tell the servo to go to the position in variable 'pos'
    delay(15); // Wait 15 milliseconds for the servo to reach the position
  }
  
  // Sweep the servo back from 180 to 0 degrees
  for (int pos = 180; pos >= 0; pos -= 1) { // Goes from 180 to 0 degrees
    myServo.write(pos); // Tell the servo to go to the position in variable 'pos'
    delay(15); // Wait 15 milliseconds for the servo to reach the position
  }
}