#include <Stepper.h>

const int stepsPerRevolution = 100;

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

void setup() {
  myStepper.setSpeed(50);
  Serial.begin(9600);
}

void loop() {
  for (int i = 0; i < 2; i++) {
    myStepper.step(stepsPerRevolution/2);
    delay(500);
  }

  for (int i = 0; i < 2; i++) {
    myStepper.step(-stepsPerRevolution);
  delay(500);
  }
}