#include <Servo.h>
 
Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards
 #define sensor 8
int pos = 0;    // variable to store the servo position
 
void setup() {
  pinMode(sensor,INPUT);
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}
 
void loop() {
  if(digitalRead(sensor) == HIGH && pos == 0){
      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(15);                       // waits 15 ms for the servo to reach the position
      }
      pos = 180;
    }else if(digitalRead(sensor) == LOW && pos == 180){
      
  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(15);                       // waits 15 ms for the servo to reach the position
  }
      pos = 0;
      }


}