//sweep code for turning servo 180 degrees and back
#include <Servo.h>
Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards
int pos = 0;    // variable to store the servo position in degrees
void setup() {
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}
void loop() {
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees, in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(5);                       // waits 5ms between each degree for the servo to reach the position (speed of the shaft)
  }
  
delay(2000);
  
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(5);                       // waits 5ms between each degree for the servo to reach the position (speed of the shaft)
  }
delay(2000);
}