ELEGOO 5 Sets 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board Compatible with Arduino

This may have been user error, but I found these motors to be very low power (to be expected, I know). Speed was pretty limited range on the top and bottom end. These motors are great for small projects that may not need as much speed adjustability. Motors do their job and are cheap to buy.

A great prototyping/experimenter kit. The motors are clearly designed for light duty but well-made and suitable for many projects. The packaging and driver boards make this a must have for anyone wanting small steppers for Arduino, Pic, or Raspberry Pi projects. The price is reasonable for the combination pack. In general, Ive been pleased with Elegoo products, including this kit.

Easy to use, An they r actually durable

After I figured out how to run these, they are pretty cool. Amazing how cheap they are. My only concern is the slop, you can rotate a large enough arm freely by a few degrees without load and maybe thats how it is regarding high gearing/backlash. Anyway not complaining different needs but yeah. I think its a great deal and once figured out how to make it work, great to use for various applications. Ive used 3 out of 5 so far ha.

For the low price you wouldnt expect high quality stepper motors and drivers. However these perform amazingly well in both torque and accuracy for their price and size. I was hesitant at first but am happy with my purchase and would buy again. They do tend to heat up after extended use or with heavier loads, however for most applications of stepper motors this isnt a problem. If you are looking at these and wanting high speed rotation & long continuos running then a regular DC 5-9v motor would better suit you. Which is what these will provide you. They dont spin fast looking at the external shaft rotation however the inner gears & 4 phases allow you to use multiple step types depending on your need. Including wave step driving with each phase cycling one on at a time giving the simplest controlled rotation for beginners. Or full step using two of four phases on at a time for highest torque. Or Half step using a mix of two phases of full step with one phase alone in between, to give highly accurate movements with medium torque. The only suggestions I would have is buy or setup a separate dc power supply for these as the arduino or other micro controllers wont have the volts and mA that you need. Also if youre a beginner or new to arduino or micro controllers or stepper motors this is for you it is simple to set up, no soldering, no prior stepper knowledge required; just plug in motor to driver, hook up all four driver digital input pins to a micro controllers digital output (like arduino, raspberry pi, etc) plug ground and power cables to relating micro controller pins or seperate power supply pins and youre done. All thats left is running a code thru micro controller. I will note however that you will need more male to female cables if you plan to hook up more than 2 stepper drivers to micro controller; Good for both experienced users for projects/fun and good for beginners who are learning about steppers or just getting started, the LED lights are beneficial for troubleshooting and making sure your code works properly. I took one of the steppers apart. Taken apart theres Aluminum casing outer shell, 1 layer of 8 teeth on casing bottom & 3 layers of 8 teeth each interspersed inside center hole of the coil plastic rings sitting on top of first teeth layer, giving you 4 layers/phases & 32 teeth total or 32 steps. Both coils are wrapped around plastic rings and sealed. Soldering on steppers and drivers look & feel solid. First coils ends being the yellow and blue wires respectively. But being unipolar the center of the coil is also connected by center tap to red wire. Bottom coil is same with ends being orange and pink, center wires are connected between both coils into single red wire. The rotor is plastic with a permanent magnet surrounding it, the rotor shaft has 9 teeth. That shaft extends up to top plate that has 3 ganged gears plus the gear for external gear shaft. All these together do infact give you a 64:1 ratio where 64 rotations of the rotor = 1 rotation of the external gear shaft. Note that one rotation of the rotor requires the 4 phases 32 steps to make one full rotor rotation. So a lot of rpm is needed to give you even 10rpm of the external shaft. This is where torque is created and heat is generated, Seems solidify enough built for its power rating and most stepper uses, mechanically the gears are setup for best possible torque

Update: Elegoo took care of the issue I had very thoroughly. Changed rating to 5 stars for excellent customer service. I will continue to make my purchases through them. [Original review] These little stepper & driver boards are GREAT for learning your way around programming. Arduino libraries are a little under gunned for these driver boards; accelstepper works much, much better. I suggest running at 6 volts or better, as under that I cant seem to get the little guys to really run. The boards are rated from 5-12VDC. Fried one in seconds at 10v (although the motor ran quite smoothly & with sufficient torque to actually use). No torque or speed really to speak of, but hey, theyre cheap. Good learning tool. Will contact Elegoo for a replacement.

I attempted to use these to build a small robot for my daughter to play with, and it did eventually mostly work. I converted them to a 4-wire motor by cutting a trace on the inside of the blue cover, and they worked fine that way. There is a lot of back lash in the gear train which was a problem for my application, so Id recommend you use them for one-directional movement if backlash or absolute accuracy is a big concern. For driving to a limit switch or just rotating a display or something slowly, theyre a great option. I did strip one of the gear sets out by accident, but theyre cheap enough to just replace and move on.

Just what my grandson was looking for. He has built a number of projects using them.

Yeah, bought these... not really looking into the details. They are VERY SLOW. Too slow for my application. I can stop the shaft with my fingers, so no real torque either.

Items as described.