#define IN1 4
#define IN2 5
#define IN3 6
#define IN4 7

const int stepsPerRevolution = 200;
const int stepDelay = 5;

int stepSequence[4][4] = {
  {1, 0, 0, 0},
  {0, 1, 0, 0},
  {0, 0, 1, 0},
  {0, 0, 0, 1}
};

void setup() {
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);

  // Start with motor OFF
  releaseMotor();
}

void loop() {
  rotateForward();
  delay(500);

  rotateBackward();
  delay(500);
}

// 🔁 Rotate Forward
void rotateForward() {
  for (int step = 0; step < stepsPerRevolution; step++) {
    for (int i = 0; i < 4; i++) {
      setStep(i);
      delay(stepDelay);
    }
  }
  releaseMotor();
}

// 🔁 Rotate Backward
void rotateBackward() {
  for (int step = 0; step < stepsPerRevolution; step++) {
    for (int i = 3; i >= 0; i--) {
      setStep(i);
      delay(stepDelay);
    }
  }
  releaseMotor();
}

// ⚙️ Apply step to motor
void setStep(int index) {
  digitalWrite(IN1, stepSequence[index][0]);
  digitalWrite(IN2, stepSequence[index][1]);
  digitalWrite(IN3, stepSequence[index][2]);
  digitalWrite(IN4, stepSequence[index][3]);
}

// ⛔ Turn off coils
void releaseMotor() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
}