ELEGOO5 Sets 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board Compatible with Arduino

These stepper motors are great for the price. They are very strong and sufficiently fast for any of my purposes. I read online that the reason they are so cheap is because they are mass produced for commercial uses, and it sounds totally plausible. These are great, versatile motors. Another reviewer mentioned that they run a bit hot, which I agree with. After a minute or so of continuous running, they start to get very warm, faster if you are running them fast or under load. Honestly, though, it's not much different than the other stepper motors I've been scavenging. For normal, non-continuous use applications, it should be fine.Although they are not super fast, I can't think of all that many applications when you would want a super fast stepper motor. With the amount of torque these have, you could gear it up anyway. I vaguely recall someone mentioning they were geared down inside the box, which seems plausible because the number of motor steps differs from the number of steps per revolution by like 32 or something, but honestly I can't remember. Sorry. If I end up taking one of these apart someday, I'll update.I won't take the time to make actual measurements for torque and speed because datasheets seem pretty readily available for these motors.The mounting holes are well placed and the cable is very convenient for quick and easy solderless connections. The motors are very sturdy and show no signs of wear despite my relentless abuse (on account of the low price). 5 Is a good number in a set.The ULN2003 driver modules are nice both for quickly testing and even for final installation, provided you are not strapped for space. The LEDs are useful for troubleshooting if you don't have much experience with stepper motors. In fact, if you don't have much experience with stepper motors, I highly recommend this set. It's cheap, versatile, and super easy to use. It's also convenient that these run on 5V.I think these take something like 500mA depending on speed, load, etc. , but I can't really remember well so that may be completely wrong. In any case, these are too big to run safely on the 5V pin of an arduino.All around, I highly recommend these stepper motors (or equivalents from other retailers) for a multitude of uses and there is a very good chance I'll be buying more of these in the future.

For the low price you wouldn't 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 don't 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 won't have the volts and mA that you need. Also if you're 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 you're 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 there's 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

Nice packaging. Came with necessary cables to prototype. I used this with an ESP32 and a couple 5V power supplies to make some automatic curtain openers. Slow, but effective. Documentation could be better, but hey, they work.