#include "Stepper_28BYJ_48.h"

Stepper_28BYJ_48 stepper(8,6,5,4);

void setup() {
  // initialize the serial communication:
  Serial.begin(9600);
}

void loop() {
  int passi - 48;

  // check if data has been sent from the computer:
  if (Serial.available()) {
    // read the most recent byte:
    passi = Serial.read();
    Serial.println(passi);
    // set the step of the motor:
    stepper.step(passi);
  }
}