Stepper motor 28byj-48 with driver board uln2003A

Hi guys, I’m italian and my english isn’t very well, so excuse me for my errors. I’ve bought this motor with his driver board:
http://www.ebay.it/itm/new-Stepper-Motor-Driver-Board-ULN2003-5V-4-phase-5-line-/370852565924?pt=LH_DefaultDomain_0&hash=item56588913a4#ht_4173wt_1055
But i’ve got any problems. I would use the arduino library called Stepper to control this stepper motor, this is the code i use:

#include   <Stepper.h>
 
Stepper myStepper(2048,8,9,10,11);
 
void setup() {
 
  myStepper.setSpeed(10);
}
 
void loop() {
 myStepper.step(2048);
  delay(1000);

  myStepper.step(-2048);
  delay(1000);
}

But the motor buzzs and the shaft doesn’t turn! If i change this line of code:

Stepper myStepper(2048,8,9,10,11);

to:

Stepper myStepper(1500,8,9,10,11);

The shaft turns, but after a complete revolution, the direction of rotation doesn’t change as it should!
Can you help me please?
Thanks :slight_smile:

Show us your wiring.

This is my wiring, but all wires are reported in order to pins 8, 9, 10, 11.

Cattura.PNG

And if you use a 9Volt battery rather than the Arduino 5 volts what happens?

I haven't tried, i tried to use an external power supply of 5V, but the result was the same.

Try:
http://www.4tronix.co.uk/arduino/Stepper-Motors.php

EDIT
Also:

/* 
 Stepper Motor Control - one revolution <<<<<<<<<<<<<<<<<<<<< Modified
 
 This program drives a unipolar or bipolar stepper motor. 
 The motor is attached to digital pins 8 - 11 of the Arduino.
 
 The motor should revolve one revolution in one direction, then
 one revolution in the other direction.  
 
  
 Created 11 Mar. 2007
 Modified 30 Nov. 2009
 by Tom Igoe
 
 */

#include <Stepper.h>
const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
//const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
                                     // for your motor

// initialize the stepper library on pins 8 through 11:
//  Stepper myStepper(stepsPerRevolution, 8,9,10,11);              
  Stepper myStepper(stepsPerRevolution, 11,9,10,8);   // <<<<<<<<<<< Note 8 & 11 swapped
void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(120);
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
//**************************    
  for (int x=1;x<12;x++)
  {
  myStepper.step(stepsPerRevolution);
  Serial.println(x);  
  }
//**************************    
  delay(500);
  // step one revolution in the other direction:
  Serial.println("counterclockwise");
//**************************    
  for (int x =1;x<12;x++)
  {
  myStepper.step(-stepsPerRevolution);
  Serial.println(x);  
  }
//**************************  
  delay(500); 
}

Thank you very much LarryD, now i can control my stepper motor with the library Stepper.
This is the correct combination of pin:

Stepper myStepper(stepsPerRevolution, 11,9,10,8); // <<<<<<<<<<< Note 8 & 11 swapped

Thanks :slight_smile:

hi guys,
i had the same problem as buster009 and i tried LarryD's posted code.
the shaft turns when clockwise code executed but in counterclockwise part it starts trembling and the shaft remains still.
is there any posibility of the step motor to have problem or something else migh cause that? any ideas plz would be apreciated.

p.s. sorry for my english, i know they are not that good.