#include <AccelStepper.h>

// Define step constant
#define MotorInterfaceType 4

// Creates an instance
// Pins entered in sequence IN1-IN3-IN2-IN4 for proper step sequence
AccelStepper myStepper(MotorInterfaceType, 8, 10, 9, 11);

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // set the maximum speed, acceleration factor, initial speed and the target position
  myStepper.setMaxSpeed(1000.0);
  myStepper.setAcceleration(50.0);
  myStepper.setSpeed(200);
  myStepper.moveTo(2038);

  // Wait for serial connection
  while (!Serial) {  ;   }// Do nothing
  // Print initialization message
  Serial.println("Stepper motor initialized.");
}

void loop() {
  // Change direction once the motor reaches target position
  if (myStepper.distanceToGo() == 0) {
    myStepper.moveTo(-myStepper.currentPosition());  }

  // Move the motor one step
  myStepper.run();
  // Print current position to serial monitor
  Serial.print("Current position: ");
  Serial.println(myStepper.currentPosition());
  // Delay for 10 milli second before moving again
  delay(10);
}