#include<Stepper.h>
const int passos=200;
const int bt1=4;
const int bt2=5;
const int bt3=6;
const int bt4=7;

Stepper motor (passos,8,9,10,11 );
const int posi0=0;
const int posi90=passos/4;
const int posi180=passos/2;
const int posi270=(3*passos)/4;

int posiAtual=0;

void setup(){
  motor.setSpeed(10);
  pinMode(bt1, INPUT_PULLUP);
  pinMode(bt2, INPUT_PULLUP);
  pinMode(bt3, INPUT_PULLUP);
  pinMode(bt4, INPUT_PULLUP);
  
}
void loop(){
    if(digitalRead(bt1)==0){
      moverMotor(posi0);
    }
    if(digitalRead(bt2)==0){
      moverMotor(posi90);
    }
    if(digitalRead(bt3)==0){
      moverMotor(posi180);
    }
    if(digitalRead(bt4)==0){
      moverMotor(posi270);
    }
}
void moverMotor(int posiNova){
  int pasNesc=posiNova-posiAtual;
  motor.step(pasNesc);
  posiAtual=posiNova;
}