ฝัง
- เผยแพร่เมื่อ 2 มิ.ย. 2017
- This tutorial demonstrates how to control bi-polar stepper motors on a Raspberry Pi in Python using a DRV-8825 stepper motor driver.
Notes, schematics, code, updates and other resources are available on my website: www.rototron.info/raspberry-pi... - วิทยาศาสตร์และเทคโนโลยี
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OMG... This guy KNOWS HOW TO MAKE A GREAT TUTORIAL! Fast, concise and NO music!!! FIVE STARS!!!!!
Who doesn't like some loud energetic dubstep when you try to memorize stuff
Yag
You do a fantastic job of presenting a complex (probably not for you) system. I am an old school mainframe programmer from the 60's-70's. I have two Raspberry Pi's and am programming the hell out of them but you put my playing to shame. Kudos and love your tutorials
One of the clearest tutorials I've ever seen. Great work. Thanks very much!
Wow, this is the most concise and informative tutorial I've ever watched, thank you for taking the time to make it!
This is far and away the best tutorial on this! Thank you so much for being so clear and concise.
Agreed. I learned more about stepper motors and how to control them in this tutorial than anywhere else I looked. After mocking up something on a breadboard and getting it working, I transferred that onto a Raspberry Pi HAT breadboard and it works fantastically
May be, but I can not understand the language of this video. For me it is therefore useless.
Thk u
I also agree A+++ on raspberry code explain and wiring info
Perfect explanation, concise, to the point and well presented. Thank you!
I am 100% sure that this is the best video tutorial on this topic in the WORLD.
This is so informative that it should reach every stepper motor enthusiast out there....
This is simply one of the best tutorials I have ever seen. Thank you so much :)
Best stepper vid I've come across yet! So many useful little nuggets in there.
thank you! I really like how you took the time to walk through all the code and explain it to us
This is an exceptionally excellent tutorial and class. Thank you so much for sharing your knowledge! I'm currently studying stepper motors for usage on precision peristaltic pumps for prototyping a dosing machine. Thank you once more, you're great!
Great tutorial, very clear explanations. Easy to understand & well structured. Thanks heaps!
Excellent tutorial, explanations are just crisp and clear.
Awesome tutorial with a great amount of details shared. Thank you!
A lot of clever little tricks sprinkled throughout this video. Thanks!
This is the best tutorial I have ever seen!
By far one of the best tutorial about the Raspberry Pi and Stepper motor i have seen
Hey... Gotta say that this video was worth watching!!!
Excellent job - hugely informative and useful. Thank you.
Great work & nice to see something without having to listen through background music .
This was exactly what I needed to see. Thank you so very much!
thank you for this work as it did open some aspects of the PI to me, but also covered the method of telling what your stepper driver is doing, so that you can set it ahead of time to around what you need with a lot less fidgeting to get the output for a given motor, (if you know the values it is supposed to receive) to get it set up, the first time. Again thank you.
Why can't every tutorial video be this good?
Excellent tutorial! Clear and concise! bravo!
thank you for this tutorial! your effort is deeply appreciated.
Wow. Such a clear explanation 👏 excellent job!
Timely, succinct and complete ... *THANKS*
This has been so helpful. Thank you for this
every time you upload amazing video thank you for your affairs
Fantastic video! Thanks for taking the time to make this. Answered all my questions and more.
Great tip using the LED to figure out the pairs. I had headers wired the wrong way till I tried this. Thanks.
You are a hero! Thanks a lot for explaining this to us this clearly! I needed someone to explain this to me like I'm braindead!
me too! I'm really good at blinking a lot
EXcellent video, just what I needed 😄
This video will help me so much, Thank you!
Best tutorial ever!
Wow this is really dense. Great tutorial, thank you :)
Excellent video!
Very Good.You have solved many questions. The BIG AH HUrH. THANK YOU.
Brilliant tutorial, to the point and no waffling. Really useful thanks very much
Very good video, very helpful! Thanks you.
Excellent tutorial. Would also like to see one with C++ control.
Very informative video. I hope you keep it up.
This helped me a lot! Thank you
Amazing video, very informative
This is an awesome tutorial
This was super helpful!! Thank you
Nanotec makes some really great stepper motors and drivers, we use these a lot for our industrial applications
THAnk you boss... thanks for deep explanantion..
Wonderful video. Engaging and informative.
Nice tutorial, thank you a lot !
This is an awesome video. I have been struggling to use a RPI with a serial port HAT to control bipolar stepper motors using old Shopbot control boards and the Shopbot DOS program through an emulator. It works, but the DOS emulation is not powerful enough to run the motors at full speed. It looks like I need to try a DRV-8825 and learn some Python. Thank you!
Great video !!
Liked, subscribed and favorited! This is awsome!
Hi guy thanks for your explain is vero complete congratulations
Very well explained
IT WORKS thank you.
After watching this video...
Me: "OK, I got it, let's try it"
My Raspberry Pi: "No, you didn't"
same to me but maybe its the version that we use... depend on version tha for i in range( in my case) is different to python 2.7
For real cuz . exactly how I feel Xd
Awesome video! Thank you!!
Hi, firstly this code (including the micro-steps) all worked great for me. I was just wondering if you could further customise the code to allow manual control of the motor (ie typing a positive or negative value into terminal so motor moves clockwise or anti-clockwise a number of steps) and then controlling multiple motors at once? I'd love to run up to 4 motors and I think this is such a solid base setup for code but looking for some help! Thanks :)
very clear, thank you
Great explanation
It worked! Thank you very much!!
Great tutorial, was just planning on playing with some stepper motors! For the current limiting calibration, if I'm using a 12V 0.4A Nema, I should set the Vref to 0.2v?
Yes, the maximum Vref would be 0.2V because Current Limit = Vref × 2
Actually, if you are only running in *full step* mode the maximum Vref would be about 0.28V because there is an additional 71% limit.
It's always a good idea to monitor the motor and driver temperature. I like to use a 5 second rule. If I can touch the motor and driver for at least 5 seconds without burning my fingers then the current is probably OK. Please note that the current can also be limited by the coil resistance. If your coil resistance is greater than 30 ohms then your current won't exceed 0.4A at 12V because of Ohm's law.
Thank you this fixed my problem!
excellent tutorial..
Brilliant. very informative
Nice info, thanks :)
can I setup a set of If then commands to follow up with an small toy machine?? like an small excavator???
You are a genius. you should be woking for space x
Great Video,
I need to move my stepper motor as a function of sine wave
lets say for time in incrementing from 0to 100s
y=amplitude*sin(2*pi*frequency*t)
so displacement of stepper motor should as per change in y
could you help me in that
I am using nema 17 and the torque reduced substantially compared to when I ran the stepper with 12V with arduino uno.... any help is appreciated
Nice work. How any stepper motors can be controlled using this driver?
Generally speaking, one stepper motor per stepper driver. In theory you could run 2 motors but I haven't tried it. You would probably need to double the current if running in parallel or double the voltage if running in series. I've heard there are issues using the DRV8255 in parallel so series would probably be the best bet.
Hello, what would be the ideal voltage of drv 8825 driver if usinf a nema stepper with 1.5A current at 12V. I want to make a button presser to press button of 1.6N in a full step mode but its skipping a step while pressing a button thus not presing it all the time
top class knowledge
I wonder if its possible to integrate PID control in this as well
Nice job.
I found this video to be incredibly helpful. I'm currently working on a project that requires me to drive 5 NEMA 17 motors. I was wondering if I would be able to use 5 of these drivers for this task. If so, would I just need to wire each driver to its own pin and then connect them all to the same 3.3 v and ground pins on the pi? Thanks for the help.
Yes in theory you should be able to control multiple stepper drivers depending on your timing requirements. At least 1 pin would be required per driver (2 if direction required.)
Excellent Thank You
Is it a good idea to connect STEP pin to hardware PWM pin on RPi? Thanks!
Hi! Thanks for the tutorial! I'd like to ask how I would implement multiple motor controllers to the Pi. Would I be able to use the multiple GPIO ports and establish what ports I am using in the code?
I’ve been asked that questions multiple times and I will probably address it in another video when I have more free time. The short answer is yes, but it depends on the type of precision and timing you need. For example CNC or 3D printing would probably require a dedicated controller. Please take a look at github.com/Nikolay-Kha/PyCNC
We are looking to control two steppers with a raspberry pi and have them open and close doors on a building. Is it possible to use a single dial of some sort to control the opening and closing of the doors. As a matter of fact, the doors only have to open and close about 15-20 degrees . So, we want to be able to turn the dial and move both steppers (one to the right and one to the left) at the same time. Can this be done with raspberry pi?
Can this be done by incorporating an arduino with the pi? We really need to use the pi
Yes, it could be done. The Raspberry Pi doesn’t have an analog input so you would need an analog to digital converter to connect the pot. I have a video on connecting ADC’s: th-cam.com/video/wJgyszOSoQU/w-d-xo.html
Potentiometers often have jitter so you would need code to smooth out the rotation and prevent unwanted movement.
Depending on the size and weight of the door, you might need an industrial stepper motor, driver and power supply. I don't think the 2A driver used in the video would work. There are more pitfalls as you scale up and you could be dealing with potentially dangerous voltages. I would use end-stops to limit the range of motion. I would also add sensors to detect if something or someone is blocking the path of the door. You could also go with a closed-loop system to accurately track the position of the door.
Please check your local building and fire codes to ensure you comply with all safety ordinances.
can you make a video on how to control a motor using serial communication with modbus rtu rs485 usb converter and python
Hello, I am trying to do the same with a raspberry pi zero, a nema 17 stepper motor and an L9110S controller but without success, the motor vibrates and spins randomly. can you help me ?
HELP PLEASE. Yes I love the presentation as everyone else has mentioned. However, I'm at a loss here... I've hooked everything us as seen, and my motor wont move at all. There's no resistance either, just as though the power is off completely...
So It's a sl42sth34-1334a stepper motor I 'borrowed' from my Flyingbear 3d printer.
The stepper driver is a generic pololu ripped from a ramps board (i tried two, same issue)
When measuring the v.ref pot, I'm getting a range from 0.00v to 0.20v (on both drivers)
The driver is green, with a small square chip. The text on the chip is: 4988ET A1640 990L
Tested motor with the LED coil test, both coils are generating power, and lighting the led.
The cap i'm using is 24v 100uF
The External PSU is 12v
If you have any suggestions, please let me know. Thank you :)
Awesome tutorial! Thanks much! One question, if I want to run 2 stepper can I use 14,15,18 for both stepper to set the resolution? Or does each motor need extra 3 pins for resolution?
You can share the pins.
rdagger68 thanks!! And another question :-) .. can you recommend any node.js module to run steppers instead of using python?
Sorry I don't have any node.js recommendations other than just searching npmjs.com for stepper motor.
wow you're genius
Great tutorial. I followed it to the dot. Unfortunately, I have failed to get my motor running. I am using a NEMA 17 motor with a rated current of 1.2A per phase, after some troubleshooting, I measured the GPIO output signal and it was 1.6V for the STEP pin, the DIR pin gives 3.3V. Im not sure if this could be the problem. If you have any pointers please help.
The voltages on the DIR and STEP pins are not the issue. The DIR pin would only change the direction of the motor. The STEP pin is being pulsed so a meter is not going to give you any meaningful numbers (you would need a scope to look at the waveform). As long as the pulses are not too fast, you should get movement. Did you set the current limit on the driver to 1.2A (a value of .6V on the Vref)? Is your motor power supply adequate? It's always possible that you got a bad DRV8825. Is the motor or the driver getting hot?
Dear respected sir, I'm very happy for your awesome video. I trying to control my CNC machine by Raspberry pi where I need to use 3 stepper motor. Please could you help me?
I don't have any experience using a Pi for CNC. I use Mach3 with a dedicated controller board for my CNC machine which uses Geckos. There are numerous examples of using the Pi for CNC such as:
blog.protoneer.co.nz/raspberry-pi-cnc-board-hat
github.com/Nikolay-Kha/PyCNC
hackerspacepardubice.cz/cnc/
Thanks a lot for your information.
You know arduino is much slower than Raspberry pi. Therefore, If I use Raspberry pi instead of arduino, Will it be much faster?
I don’t know. Perhaps it’s an ambiguous comparison because many solutions off-load the processing to external hardware. For example, the Protoneer Pi CNC hat uses an embedded Arduino for its micro-controller. Again, I haven’t done any CNC with the Pi.
First example which actually made my motor run using Python on the Raspberry, a lot of other tuts did not make my motor run. I used Livecode too, which also works, but the graphic interface interferes with the motor strangely. With the GPIO i got errors like: please use GPIO.setmode(GPIO.BCM) which i did, so i don't understand this error, also it also run only CW and not CCW, could see the motor react on it and stalled.
thank you
Most excellent
Hey great video! Would you have any advice on using the TB67S128FTG instead of the DRV8825? I love the wiring diagram you show with the RPi, motor driver, and stepper motor. However, I can't find a similar one for the TB67S128FTG.
Haven't used it but Pololu has some resources: www.pololu.com/product/2998/resources
Hello, very good tutorial, hepled me a lot! I just have one problem, I wanted to build a robot and use the stepper motor for the movement but your tutorial show the stepper driver still connected to a power supply, which is impossible for a robot. How can I bypass this problem?
A 12V battery should work similarly to a 12V bench power supply assuming the battery can provide the necessary current. Please note that stepper motors draw power continuously regardless of motion which may not be optimal for a battery powered application.
This is the best tutorial I have seen. However, could you tell me please how the code becomes if we want adjust the speed of a stepper motor by selecting a specific frequency (example :1010 Hz) using hardware_PWM(18, frequency, duty cycle) and then rotate the motor with a specific angle at that speed ?
To accurately control both frequency and steps, I think you would need to use the PiGPIO _generate_ramp()_ method. I’m not sure if it supports the hardware PWM which would afford more precise frequency control. It might automatically switch to hardware if you use GPIO 18. You would have to hook up a scope to determine if you are getting the correct frequency. You could also ask Joan the creator of PiGPIO. She is very good about responding to questions and she might have additional recommendations.
exellent
Thank you for the Tutorial :) can i use the second method but with specifying the number of steps for a more precise control ?
and for the first one, can i use it like that ? : GPIO.high , delay1, GPIO.low, delay2 , with 2 different delay times ? thank you in advance :)
Assuming you are referring to the Pigpio approach, yes you can use the generate_ramp() method which takes arguments for frequency and number of steps.
I followed this to the letter looking for answers why my stepper motor does not turn smoothly, but is very erratic and jumps in both directions. I've been hoping to find out why I'm having this problem.
I am building a cnc and want to use raspberry pi 3 to control it, I have the gecko type drivers. Any diagrams for how that would hook up? Great info 👍🏼
The hook up should be similar to the video but it is very important to read all the application notes on Gecko's website because the Geckos are easy to damage (depending on the model). You'll want to use 3.3V for the direction and step pulse because the Pi's GPIO pins will not tolerate 5V. I don't have any experience using a Pi for CNC. I use Mach3 with a dedicated controller board for my CNC machine which also uses Geckos.
Hey, in the last code even the loop is infinite my step motor stop after accelerated a few seconds later.
Hi, this video is a bit over my head. Can you recommend a video that explains all the things you are doing and why? Thanks.