#include <Servo.h>
Servo myservo;
#define buttin 10
int summer = 1;
void setup() {
  myservo.attach(9);
  myservo.write(0);
  pinMode(buttin, INPUT);
}
int pos=0;
void loop() {
  if(digitalRead(buttin)==false){
    pos += summer;
    delay(10);
    if(pos==180){
      summer = -1;
    }
    if (pos==0){
      summer = 1;
    }
  }
  myservo.write(pos);

}