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

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

I bought these motors for a Raspberry Pi star tracking telescope project. I'm doing hacker stuff with my daughter. Got the 5-pack because hey, they're not costly, we'll want to make many other projects anyway. Plus, we don't want to be afraid to let the magic smoke out of our Only One critical component so we always get several. We also like to test the limits of devices and the only way to find the absolute maximum limit is to go just a little bit more. The tested motor and board is as described in the listing. I drove it straight from the +5V pin of the Pi3, which is strongly not recommended because excess current draw might reboot your Pi. Torque is great for such a tiny motor. I was able to google the necessary information and operate the motor in Python with my Pi3 in just a few minutes. Some minor adaptation of the available information was necessary for our specific workflow - which is the hacker life. It wouldn't be fun without that. It's nice that the board and motor are together so we don't have to guess if they'll cooperate. I understand the tiny motor controller boards work with a wide variety of stepper motors, so it's great that we have a pluggable connector instead of wires soldered on. We will be using that. I'll probably be scavenging steppers from inkjets and scanners for months. They work with all the little programmable boards that make GPIO, so they'll be fine with a Pi Zero when we put them in service. But we'll develop on the Pi3. You're not going to get a lot of RPM out of these. That's not what they're for (and, specifically for our first application we're gearing down to 7*10^-4 RPM obviously). Also, these are not industrial stepper motors for your production line. And they're not going to drive your electric vehicle. People are asking questions about the gearsets to use with these. My motors came with a 5mm axle, double flat. Previously we bought a plastic gear set through Amazon: UCTOP 80Pcs Plastic DIY Robot Gear Kit Gearbox Motor Gear Set For DIY Car Robot The "D5" gearhead (the blue gearhead with the largest bore and a flat) fits diametrically, though the flat is not deep enough. I'll be filling that gap with epoxy, and it will work just fine. You can get a number of setscrew 5mm bore heads for your project. There's one with "timing belt" that looks interesting. It would be nice if someone with these motors and a matching gear set would post a review so we know what to buy. The seller of the motors, maybe? If it was me I would put the ASIN of the matching gears right in the product description, as it would help to move product - or even sell the gears myself. I happened to order some jumper wires in the same order. These saved a lot of time. Whether you're connecting to a male header on the Pi or your breadboard, there's a set of jumpers just right. These things are precious. You just peel off however many leads you need. Elegoo 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Wires Ribbon Cables Kit for arduino Is what it says, slamming deal, excellent delivery. Would buy again.

These are super easy to use and work great for the price. Unloaded they seem to need about 2.5 milliseconds for each step. As for reliability, I've used 3 out of the pack of 5 and all worked flawlessly. This is my second batch of these things and I've never had any trouble with them. One of them I tried running at 13.8 volts to get more torque for a particular job it was too weak for at 5V. It got hot enough to melt the PLA plastic I'd 3d printed to attach to it because I left it on too long. The driver chip was also very hot. Both worked fine after cooling down. Obviously you shouldn't do this and YMMV but I was really impressed the motor and driver survived that. You can run it as long as you want at 5V and it won't get hot.

These motors actually feel pretty good and are relatively easy to control. They'll even take a 3.3V control input, which makes them great for STM32 and STM8. Their step size is really fine due to their gearing. However, they do have quite a bit of backlash, which hinders their repeatability somewhat. Nevertheless, they'll be good for learning how to control stepper motors and for places where accuracy isn't too critical. They aren't particularly strong at 5V and tend to stall out under light to medium loads. Despite their voltage rating, they run perfectly fine at 9V (Do so at your own risk!) and are definitely more powerful, but get much warmer, as to be expected. They are a bit noisy due to the gearing, but are definitely on the quiet side when it comes to steppers. Overall, they're a good starting point for stepper motor control, and perhaps even small robotics applications. And for the price, they're pretty good at what they do. Plus, the plastic box they include is handy for storing the motors, or other projects.

I'll rate this stepper motor for what it is, not against stepper motors in general. This is a very inexpensive stepper motor (the motor, along with its driver board, is often under $1.50 ea. ), used extensively in such things as 2D and 3D printers and plotters, DVD drives, motion picture cameras, etc. Their cost and versatility make them a great motor to play around with, which is what I do. Cannot beat it.

Works as-advertised. These will not slew fast. What I misunderstood: "step angle: 5.625 x 1/64, Reduction ratio: 1/64" The full step angle is 1/64 of 360 degrees = 5.625 degrees. But then there's a 1/64 reduction on top of that: so the full-step is ~0.079 degrees, and the half-step is 0.0444 degrees. At first I thought the shaft wasn't moving. The steps were too small to see, even with the pointer attached.

one board failed out of the box, others are fine.

I've purchased five boxes of these, and given them to various young folks, along with a matching Arduino and wires. they all expressed interest in computers and electronics and robotics, so these are a great way of helping them, The included stepper motor is used in the Air Conditioning industry to move air vents. Being geared down, it has a good amount of torque. Also, being slower makes it a better "teaching/learning" item. The included driver board has four LED's to indicate when the step pulses are active, which again makes it a better "teaching/learning" item. Elegoo has some good example code on their website, and other code and tutorials are only a Google search away. I'm building some vehicles to "crawl" inside the crawl spaces and AC ducts inside my house. These will have a couple of cameras, and be tethered to simplify construction and operation. The slow speed is actually the best part, as it's hard to see anything if they were to sprint along. So yes.... VERY low price (two dollars per set(motor/driver); makes it "throw-away" and stress-free), good torque, teachable.

Todos los motores y controladores funcionan bien. Motores básicos con engranajes de plástico y sin mucho par, pero perfectos para aprender y diseñar. Además viene todo dentro de una caja de plástico ideal para almacenarlos y guardarlos. Lo recomiendo.

Ottimo set per iniziare a sperimentare con un Raspberry (ho costruito una pedana rotante step che, con una webcam USB, fa foto ad un oggetto per creare un oggetto 3d)

Prodotto come da foto , perfettamente funzionante

bien presentados en cja con todo lo que se describe.

Kit completo para hacer funcionar sin otros aditivos, los motores. No le doy 5 estrellas porque podrían incluir un prospecto con los datos esquemáticos de los motores identificando las bobinas y relacionándolas con sus cables de salida, aunque esa información se consigue fácilmente por internet.