#include<Servo.h>
Servo servo;

void setup() {
  servo.attach(9);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  servo.write(0);
  delay(2000);

  servo.write(90);
  delay(2000);

  servo.write(180);
  delay(2000);

}