6 PCS 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board

This is an amazingly low price for 6 stepper motors and 6 drivers. I feared they would be too cheap to work, but they work great! You can find a test program on Amazon from some vendor. I ran it immediately on a Teensy 4.0, then translated it to Raspberry Pi (C++). We are using two of them in a scientific instrument to tune a matching network..

These look like they will work perfectly for my purpose. I am going to set these up to be switch machines on a model railroad. Tested one and it rotated 180° each step at a slow speed which is perfect. Great value! I used Arduino to test my mock up.

Servos worked as expected on my Raspberry Pi Zero but I broke one when turning it manually. Good thing I bought extra!

Compared to larger NEMA-style motors, this takes far less current and is stronger. Nowhere near as accurate, but has more torque for the same current and FAR more holding power. What's nice is the holding power without any current! The NEMA-14 and NEMA-17 steppers are very easy to turn when the coils are not energized. There are 2048 steps per revolution: * It has 32 steps x 1:64 gear ratio. * That's (360 / 32 / 64) = (11.25 / 64) degrees per step (the product info says 5.625 which is half the true amount). You can convert this unipolar motor to a bipolar by popping off the plastic cover and cutting the trace between the center two pins. Then the supplied drivers cannot be used to drive it, but you'll be able to use a standard bi-polar motor driver to get even more toque out of it. And if more toque is desired, some of those drivers come with configurable current limiting, so you can use a higher voltage (e.g., 12V) to drive this motor and tune it for 300mA and those drivers ensure you don't burn it up. You could probably drive this at 24 or even 36V with the TI 8434A. These motors do get hot, though, if energized continuously for several minutes. That's why I limit them to 300mA and deactivate them in between uses (de-energize their coils). I've provided a photo of how to modify the internal PCB for those brave souls who want to use their own bi-polar motor driver, instead of the one included.

There are many hobbyist projects that use 28BYJ-48 stepper motors. They are inexpensive, small, reliable and this vendor not only supplied the needed driver boards but also included jumper cables for easy prototyping.

My first project using this stepper motor and controller board using Arduino. It was used to power a 3D printed clock and it worked great. I now have 5 extra motors and control boards for future projects and the price was very good also.

Used these for testing and later for valve operator for A/C system. Well made and I abused to see limits. Worked well at 200% of limit and is now in use.

Items were reasonably neatly packaged and came quickly. Four stars because the box seems too small as seen by the dents in the cardboard from the motor shafts and one of the DuPont wires was missing it’s cover on one end (green wire). It’s slightly unprofessional. The boards seem in decent shape and I will be testing them. If I do not update my review assume they all worked as intended. For the price, I’d say it’s worth it.