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
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
One of the clearest tutorials I've ever seen. Great work. Thanks very much!
Perfect explanation, concise, to the point and well presented. Thank you!
Wow, this is the most concise and informative tutorial I've ever watched, thank you for taking the time to make it!
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....
thank you! I really like how you took the time to walk through all the code and explain it to us
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.
Great tutorial, very clear explanations. Easy to understand & well structured. Thanks heaps!
Best stepper vid I've come across yet! So many useful little nuggets in there.
This is simply one of the best tutorials I have ever seen. Thank you so much :)
Awesome tutorial with a great amount of details shared. Thank you!
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!
Excellent tutorial, explanations are just crisp and clear.
Excellent job - hugely informative and useful. Thank you.
A lot of clever little tricks sprinkled throughout this video. Thanks!
Hey... Gotta say that this video was worth watching!!!
By far one of the best tutorial about the Raspberry Pi and Stepper motor i have seen
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!
This is the best tutorial I have ever seen!
thank you for this tutorial! your effort is deeply appreciated.
Timely, succinct and complete ... *THANKS*
Excellent tutorial! Clear and concise! bravo!
Why can't every tutorial video be this good?
Wow. Such a clear explanation 👏 excellent job!
Great tip using the LED to figure out the pairs. I had headers wired the wrong way till I tried this. Thanks.
Fantastic video! Thanks for taking the time to make this. Answered all my questions and more.
This has been so helpful. Thank you for this
every time you upload amazing video thank you for your affairs
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
Very Good.You have solved many questions. The BIG AH HUrH. THANK YOU.
This video will help me so much, Thank you!
Nanotec makes some really great stepper motors and drivers, we use these a lot for our industrial applications
EXcellent video, just what I needed 😄
Wow this is really dense. Great tutorial, thank you :)
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!
Brilliant tutorial, to the point and no waffling. Really useful thanks very much
Excellent tutorial. Would also like to see one with C++ control.
Best tutorial ever!
THAnk you boss... thanks for deep explanantion..
Very good video, very helpful! Thanks you.
Excellent video!
Very informative video. I hope you keep it up.
Amazing video, very informative
This helped me a lot! Thank you
This is an awesome tutorial
This was super helpful!! Thank you
Wonderful video. Engaging and informative.
very clear, thank you
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
Nice tutorial, thank you a lot !
Liked, subscribed and favorited! This is awsome!
Hi guy thanks for your explain is vero complete congratulations
Great video !!
Awesome video! Thank you!!
It worked! Thank you very much!!
Great explanation
Very well explained
You are a genius. you should be woking for space x
Brilliant. very informative
top class knowledge
excellent tutorial..
Excellent 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 :)
Nice info, thanks :)
thank you
wow you're genius
Nice job.
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
Most excellent
Thanks
THANKS
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!
can I setup a set of If then commands to follow up with an small toy machine?? like an small excavator???
exellent
very nice.
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
I wonder if its possible to integrate PID control in this as well
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.)
awesome!!
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.
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.
Hi I starting my small project with stepper motor and I found your solution for controlling it , I am very impressive of you work , The last part using hardware_PWM is great and doing exactly what I need , but one thing :) how to change the direction instead slowing down. I mean the motor will do one ramp on CW direction then another ramp but on CCW direction .
I'm not sure I understand your question. It has been a long time since I used this library, but you should be able to set the direction using pi.write(DIR, 0) or pi.write(DIR, 1).
@@rdagger Thanks a lot, I have solved my problem .
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.
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
thank you
Thumbs up!
Is it a good idea to connect STEP pin to hardware PWM pin on RPi? Thanks!
First off thank you for such a clear and detailed explanation of this process. I have been successful in performing your steps. My application has a need for switch controlled movement with a pair of momentary buttons. ex. button 1 press moves ccw until released and a press of button 2 moves cw until released. Any guidance for this capability would be appreciated. I don't want to have to change over to an Arduino solution if i don't have to. My application is for a Z-axis bed for a laser engraver that will be controlled separately. Again thanks for your videos..
My example with the toggle switch would work. You just need to change the main loop to something like:
dc = 128
if pi.read(SWITCH1) == 0:
pi.write(DIR, 0)
elif pi.read(SWITCH2) == 0:
pi.write(DIR, 1)
else:
dc = 0
pi.set_PWM_dutycycle(STEP, dc)
sleep(.1)
@@rdagger thanks for the head start... i'll be giving this a try soon.
I am wanting to use a Raspberry Pi Pico to run a NEMA 34 stepper motor. IMO using a raspberry pi to run a stepper motor is like driving an 18 wheeler to the store to buy milk and eggs. Granted the Pico was released after this video was made. The problem with the Arduino is the frequency is not high enough to run the NEMA 34 at maximum speed. I am going to experiment with the DRV-8825 Controller since it takes up less Real Estate then a standard Stepper Controller.
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
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
can you make a video on how to control a motor using serial communication with modbus rtu rs485 usb converter and python
i wish there would be a implementation for gpio in ugs or bcnc or something, so you can actually use your rpi directly without having to connect a extral driver board. it's just a matter of programming, but nope.... non existing, or at least, not to be found.
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.
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.