//Declaration of Driver pins
byte IN1 = 4;  
byte IN2 = 5;  
byte IN3 = 6;  
byte IN4 = 7;  

//Step sequence
const int UnPaso[4] = {B1000, B0100, B0010, B0001};

//Variable indicating the number of steps
int paso = 2048; // 360° a full step
//Step counter
int Cpaso = 0;

void setup() {
  // Configure 4 Digital Pins as OUTPUTS
  for (int i = IN1; i <= IN4; i++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  // Move forward
  for (int i = 0; i < paso; i++) {
    Cpaso++;
    if (Cpaso >= 4) {
      Cpaso = 0;
    }
    for (int j = 0; j < 4; j++) {
      digitalWrite(j + IN1, bitRead(UnPaso[Cpaso], j));
    }
    delay(5); // Adjust delay for speed
  }

  // Move backward
  for (int i = 0; i < paso; i++) {
    Cpaso--;
    if (Cpaso < 0) {
      Cpaso = 3;
    }
    for (int j = 0; j < 4; j++) {
      digitalWrite(j + IN1, bitRead(UnPaso[Cpaso], j));
    }
    delay(5); // Adjust delay for speed
  }
}