Відео

Please make more vides like that

use AccelStepper Library, more simple with max speed and acceleration variables!!

Sir, your only 3 videos were the best. Will you please come back to UA-cam. I don't think you understand the clarity and distinct method you use to explain your works. Your style is unmatched and we will miss out on your knowledge if you don't donate it to us. Please come back 😢

It sounds like you’ve done a thorough comparison of different actuators for your robotic arm project. Here’s a brief summary of what you covered: 1. **DC Motors**: - **Pros**: Simple, low cost. - **Cons**: Difficult to control speed and acceleration accurately. Not precise enough for high-precision applications. 2. **Servo Motors**: - **Pros**: Includes a position feedback mechanism, decent torque. - **Cons**: Limited rotation range (typically 180 degrees), precision can be lacking, and not ideal for applications requiring more than 180 degrees of rotation. 3. **Stepper Motors**: - **Pros**: High precision with defined steps, better control over position and acceleration. - **Cons**: Lower torque compared to servo motors, requires additional components like drivers and possibly sensors for homing. For your robotic arm, you decided on **stepper motors**, specifically the NEMA 17, due to their precision and control capabilities, despite the need for additional components and lower torque. The plan to use a gearbox to increase torque is a good approach to address the torque limitation. You also mentioned future improvements, such as implementing smooth acceleration and deceleration to make the arm's movements less abrupt and more fluid. That’s a great next step to enhance the overall performance of the robotic arm.

Great explination. Thank you Sir

I strongly recommend designing from the wrist to the shoulder, one step at a time. You'll never unexpectedly run out of torque.

Thank you for posting the files. I'm trying to utilize ConstantAcceleratioStepper2 and I need a bit of help. Are you available to answer a couple of questions? Thanks very much. Regards

Couldn't you do something like: for (stepperDelay = 3000; stepperDelay >= 700; stepperDelay = stepperDelay*.99) and achieve similar results? I mean, unless I am not understanding something, I was lost on the explanation of angular and linear acceleration, it seems as what you are looking for is acceleration that is proportional so that the speed ramps up in a straight line instead of curving.

HOW DO YOU MAINTAIN A REQUIRED SMOOTHNESS OF COORDINATED MOTION AMONG STEPPERS?

Subscribed 😉👍 👏👏👏

Big show 😉👏👏👏 great video !

it's a pity that you stopped posting new video, it would be awesome to see the finall roboproject.

Fantastic Video and explanation, but I wonder what the formula would be for the number of steps for deaccelerating to stop using the linear algorithm. Thank you!

😮❤

Can it be possible follow with Stepper motor ua-cam.com/video/K7FQSS_iAw0/v-deo.htmlsi=arbj93d4FtY-aq5e

could you please provide more info about the nema 17 motor , is there a link i can read more about it , thank you

Have you considered BLDC motors? HDD uses this type of motor to spin the disk with high precision.

The servo motor can be hacked to provide 360 rotation. If you take it apart you will notice little notches which mechanically limit rotation. Use a Dremel to grind down the limiters and bam! 360 rotation. 👌 You will learn these things over time.

awesome video, i really enjoyed it!

Thank you. This will be a valuable asset in coding for Stepper Motors, as in some cases, the motor won't start at high speeds without problems. Thanks

wow amazing video you gave me so much insight about servo and strepper motors

For driving stepper motors, I would highly recommend TMC drivers like TMC2209. These drivers can run the motors silently, have sensor-less homing feature and can run much higher current through them.

I agrey with BlakeRobrt

Do you know the name of an integrated circuit that gradually increases the frequency, which means acceleration?

For me, this is a very valuable video because it shows me how to code part of my project that I know quite a bit about but didn't know how to even begin to implement the up/down ramps. Actually, I think I can package his code into my support code verbatim. This is an excellent presentation with really clean and consice code. This engineer really knows his trade! You, Sir, will be saving me many hours of grief and constipation. Thank you so very, very much...... FWIW: 45+ yrs ago, I was the senior electronics design engineer in a small company that was developing a product that relied heavily on the performance of a stepping motor to slew and position a print head on a highly advanced dot matrix printer. Too often in testing, the stepper would 'lose sync' when starting or changing direction. It could lose one or two steps or totally lose it and chatter/vibrate like the dickens. A few lost steps resulted in fuzy characters being printed. The software weenies blamed my Z80 hardware design, but my cohort in crime explained to me what was happening and educated me on the need to 'ramp' stepper motors. Charley had Been-There-Done-That years before in a previous job. Along with becoming a lifelong personal friend, Charley was a very good and experienced engineer with many talents. When I diplomatically explained the situation to the software iguneers, they balked, told me to mind my own business, and complained to the owner that I was interfering with their work. The boss called me in and said I needed to leave the 'kids' alone. Later, the 'kids' convinced the boss that they were working with bad motors and an inferior Z80 hardware design that was losing interrupts, which of course was my fault. He asked the manufacturer/supplier to come up and help identify our hardware problems. The supplier evaluated our hardware design and motor control microcode and said nothing was wrong with the hardware but that the microcode was really lacking and really bad. As they briefed a bunch of us on their findings, a small smile creeped across my face, but our boss never looked at me. I think he was embarrassed. Four weeks later, we had a new software team leader, 2 of the original 4 'kids' were laid off, and I was appointed as project engineer with oversight over the entire project. BTW : I think those 2 kids should have been fired. The other two were good guys who knew their stuff, and one of them picked up where the two losers left off and fixed the code to perfection. Anyways, as the almighty stepper motor god in the back room sais, 'Don't ever forget your ramps, your job may depend on it'.......

thnx a lot that's helped me

Thanks

please can you explain to me why there is no delay after digitalWrite(stepPin, LOW)?

Timestamp(Num_Step)=(sqrt(2)*(ALPHA/STEP_MODE))/ACCELERATION*(sqrt(Num_Step+1)-sqrt(Num_Step)) Calcul de l'intégrale sous la droite de vitesse en considérant une accélération constante ACCELERATION in step/s/s ALPHA = unit/s^-1 = 1000000 (for µs) STEP_MODE = number of precision steps / real step = 1 by default (maybe 1/2/8/16/...) Note : ((sqrt(2)*(ALPHA/STEP_MODE))/ACCELERATION) is a fixed value and could be calculated one time per stepper acceleration to freed up some CPU time

keep up the amazing work dude very informative

Time is always an issue when working on software with precision movements and add work also. Where does your life go with so little time? Your videos are A+ rating

good video

Thank you. I'm going to look around your channel to see if you added interrupts for my motors

Bravo 👏 👏 merci

Thoughts on using brushless DC motors? It seems like the benefits would be greater but cost would increase so Def not used for many diy robots.

Nice thought But I am bit confuse about your for loop. You are decreasing pulse width/delay and giving it to motor. So acceleration you are giving to one micro step of motor. Or Acceleration to one complete rotation of motor ?

Im actually making a robot arm for a school project! THX for your video!

That big DC motor with extra wires Those wires are for encoder it's very accurate if you know how to use them

in your for loop, instead of incrementing delay, if you increment the frequency then calculate the corresponding delay, the acceleration will be linear, right?

Hi Sichun Xu, I love your presentation. I would like to know if I can stop the stepper motor in one spot indefinitely , then when I switch off my machine the stepper motor reverses to original position

great stuff ! I would love to see more about the arm project.

You NEVER want to disconnect the ground. You always disconnect the +

Dude almost 1 year completed where is your robotic arm

I saw you only have 3 videos. Really interesting I wish you would keep making them!!!!

Not sure about 180, most likely potentiometers can rotate 270 degrees

great explanation

Great video 👍

Hanzhen harmonic drive gear , over 30 years experience , robot gear , joint gear reducer

very interesting, i typed your code and tried it for myself, i couldnt find the link to the github, i guess to make drive a robot arm you will update the code so that you can drive from a possition to an other while accelerating and keeping a stady max speed and deselerating before you reash the end possition. Is this about right or you have something else in mind? I'm also in the prosses of building a robot arm, i would love to see more videos from you.

How far are you in the project?