#include <Servo.h>

Servo myServo; // Create a Servo object

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

void loop() {
  // Sweep from 0 to 180 degrees
  for (int pos = 0; pos <= 180; pos += 1) { // from 0 to 180 degrees
    myServo.write(pos); // Set the servo position
    delay(15); // Wait for the servo to reach the position
  }

  // Sweep from 180 to 0 degrees
  for (int pos = 180; pos >= 0; pos -= 1) { // from 180 to 0 degrees
    myServo.write(pos); // Set the servo position
    delay(15); // Wait for the servo to reach the position
  }
}