#define Enable  23
#define Dir 17
#define Step  18
#define MS1 22
#define MS2 21
#define MS3 19
#define step_per_rev 200
#define timestep 5000
#define chave_dir 26
#define btn_step 25
unsigned char ea,ef;
void setup()
{
  Serial.begin(115200);
  pinMode(Enable, OUTPUT);
  pinMode(Dir, OUTPUT);
  pinMode(Step, OUTPUT);
  pinMode(MS1, OUTPUT);
  pinMode(MS2, OUTPUT);
  pinMode(MS3, OUTPUT);
  pinMode(btn_step, INPUT);
  pinMode(chave_dir, INPUT);
  delay(10);
  digitalWrite(MS1, LOW);
  digitalWrite(MS2, LOW);
  digitalWrite(MS3, LOW);
  ea = digitalRead(btn_step);
}

void loop()
{
  if (digitalRead(chave_dir)){
    digitalWrite(Dir, HIGH);
    Serial.println("Sentido horario.");
  }else{
    digitalWrite(Dir, LOW);
    Serial.println("Sentido anti-horario.");
  }
  ef = digitalRead(btn_step);
  if ( !ef && ea){
    digitalWrite( Step, HIGH);
    delayMicroseconds(timestep);
    digitalWrite( Step, LOW);
    delayMicroseconds(timestep);
  }
  ea= ef;
}