#include <Stepper.h>

const int stepsPergorden = 30;  

Stepper myStepper(stepsPergorden, 8, 9, 10, 11);

void setup() {
  myStepper.setSpeed(60);
  Serial.begin(9600);
}

void loop() {
  Serial.println("membuka");
  myStepper.step(stepsPergorden);
  delay(500);

  Serial.println("menutup");
  myStepper.step(-stepsPergorden);
  delay(500);
}