#include <Servo.h>
int servoPin=9;
Servo Servo1;
void setup() {
  Servo1.attach(servoPin);
}

void loop() {
  Servo1.write(0);
  delay(1000);
  Servo1.write(90);
  delay(1000);
  Servo1.write(180);
  delay(1000);
  Servo1.write(270);
  delay(1000);
}