Small 4 Axis Stepper Robot Arm

A Raspberry Pi & Arduino robot arm I made a few days ago. I used very cheap 28BYJ-48 stepper motors. You can find them for a few dollars on amazon. This project felt like a proof of concept. I wanted to proof to myself that it is possible to make a stepper robot arm with very cheap components. At this point in time, the robot arm isn't able to do anything interesting. A teach function is probably the next thing I will add to it. And some kind of gripper. It really needs a gripper!
Here's a blog post about this project:
electrondust.c...
Here are some other things I used on the robot arm:
- A Arduino Mega (This runs a fork of the superb grbl stepper controller software)
- A4988 (The stepper drivers)
- A Raspberry Pi 3 (The replica arm is connected to this. The Raspberry Pi send Gcode to the Arduino via serial)
Here's the code I used on the Raspberry Pi:
github.com/T-K...
The Pi controls an Arduino Mega running a grbl fork with 4 axis stepper support. Here's the fork:
github.com/dgu...

[@therandomguy4988]

AWESOME, Im trying the same with car starter motors

[@773ivan]

you need to use encoders! -then everything will work faster!

[@عبداللطيفالمشعور-ب2ج]

Tank you

[@MarinusMakesStuff]

I SO want to build my own arm. Looks really interesting. I have bought these stepper motors with drivers and am waiting for them to arrive. Just to make a little gimmick kind of project of a small robot arm. Did you consider using rotary encoders for the input instead of resistance pots?

[@ElectronDust]

I didn't, but it sounds like a great design choice.

[@MarinusMakesStuff]

@@ElectronDust I don't know how to translate rotary encoders to a smooth movement, but it should be possible.

[@TheChromePoet]

@@ElectronDust Thank you.

[@ProfessorVector]

Is it fast enough and have enough force to play an xylophone?

[@krazynut454]

How did you attach mechanical arm with the rotating shaft of the motor?

[@botak333]

It posible to record the movement sir?

[@leandro3710]

awesome!

[@kennethkindrich3114]

How do you get such quick movement from those 5v stepper motors? When i put the motors to 5v they move slowly or vibrate

[@8777ga]

nice ! :)

[@tomfebry]

How is that wood attached so strongly to those motors

[@jontriggerprivatei]

Any progress on this? I'd love to know if you managed to cut down on the latency issues in a more recent iteration

[@ElectronDust]

I made some progress. And the latency did go down a bit. Here's the latest video: kzbin.info/www/bejne/Z5aYp4WmhKl0ic0&t

[@royalmakai4956]

Instablaster...

[@aku7345]

How you made a hole in links, can you give me idea?

[@menukagamage5073]

It would so K if you can add record play back for motion

[@efikamara]

Very nice! Could you please share the code used?

[@ElectronDust]

Here's the code I used on the Raspberry Pi: github.com/T-Kuhn/StepperRobotArm The Pi controls an Arduino Mega running a grbl fork with 4 axis stepper support. Here's the fork: github.com/dguerizec/grbl-Mega-4axis

[@ElectronDust]

I really want to write up some small blog post about the thing, with all the hardware connections etc. But I haven't got around to do it.

[@efikamara]

Thank you

[@ElectronDust]

I wrote a blog post about the robot arm. Thought you might be interested: electrondust.com/2018/01/21/small-stepper-robot-arm/

[@eachineonlineeducation780]

I am new ....How to do this ?

[@williamhuang5329]

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

[@RangavittalaSR]

Very nice sir, Where did u got these motors

[@ElectronDust]

I actually just bought them on Amazon. Just search for " 28BYJ-48".

[@tawassolcellule7898]

Ranga vittal u

[@SwarthySkinnedOne]

Hmmm. I'd take that further. Add some reduction gears to the motor drive shaft to work the joints of the arm, enclose the whole apparatus, house it, and add powerful end effector. Should be able to lift and carry 5lb weight effortlessly to another spot and place. Hope you take it further. I would.

[@p-automation4558]

Can you use raspberry pi zero instead?

[@ElectronDust]

Yeah

[@bhaviksonawane3932]

can u just share a brief procedure of this project.

[@ElectronDust]

I will write something up in the next two days. But here's a really quick summary: - This robot arm uses 4 cheap geared stepping motors. - The motors are powered by 4 A4988 drivers. - The drivers are controlled by an Arduino Mega running a modified version of "grbl": github.com/dguerizec/grbl-Mega-4axis - The Arduino waits for movement commands coming in via serial port. - The movement comments are being sent from a Raspberry Pi. - The replica arm which is used to control the pose of the arm is mode of 4 potentiometers. - The potentiometers are connected to a MCP3006 (this is a A/D converter chip). The chip is connected to the Raspberry pi via SPI. - The Raspberry Pi reads all the potentiometer values and sends position commands to the Arduino. - Here's the complete code for the Raspberry Pi: github.com/T-Kuhn/StepperRobotArm That's roughly what it is made of and how it works.

[@ElectronDust]

I wrote a tutorial-like blog post. Hope it helps: electrondust.com/2018/01/21/small-stepper-robot-arm/

[@abdulrojak8556]

Awesome ,,please make the tutorial ,,,

[@ElectronDust]

Yeah, I am working on a tutorial. I think I will finish in about 3 days.

[@abdulrojak8556]

great,,i will subscibe your chanel,keep go on,,,

[@ElectronDust]

Thanks!

[@ElectronDust]

I wrote a tutorial-like blog post. Hope it helps: electrondust.com/2018/01/21/small-stepper-robot-arm/

[@abdulrojak8556]

thank you so much its so helful,,

[@kunaltaurani9445]

How to make automatic soldring from this??

[@Enoch_The_Gent]

Did you have to find the zero point to do this?