Watch winder

Watch winder with detachable holder.
Fits best 18mm strap.

Parts used:
28BYJ_48 stepper with controller
Arduino Uno
M3 screws and nuts

Code:

#include "Stepper_28BYJ_48.h"

unsigned long delay_time = 900000; //15
int loops = 3; 
int turns = 3; 
unsigned long previousMillis=0;
Stepper_28BYJ_48 stepper(7,6,5,4);
void idle(){
  digitalWrite(7,LOW);
  digitalWrite(6,LOW);
  digitalWrite(5,LOW);
  digitalWrite(4,LOW);   
}
void turn(){
    for(int i=0;i<loops;i++){
      stepper.step(turns*512);
      delay(200);
      stepper.step(-turns*512);
    }
    idle(); 
}
void setup() {
 turn();
}
void loop() {
  unsigned long currentMillis = millis();
  if ((currentMillis - previousMillis) >= delay_time) {
    turn();
    previousMillis = currentMillis;
  }
}