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Recent Posts

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Member Introductions / Re: Try to study here ;)
« Last post by Phebex on May 23, 2016, 01:49:03 AM »
That fine if you are busy now.

My Brushless is
MARSPOWER 220880T Brushless Gimbal Motor, you can google it, but hard to find datasheet.
there is 14 pole and 12 cogs.
Yes, after I tried to understand the theory of brushless (trigonometry). I also suspect that. there may be a step is missed.

Sorry if it makes you misunderstood. im not using h-bridge at a trial, This trial temporarily halted, because I'm ordering the item.
Member Introductions / Re: Try to study here ;)
« Last post by ElectroNick on May 22, 2016, 02:59:53 PM »
Hello Phebex,

Thanks for stopping by my blog/site.

I have to admit, it's been 5 years since I've done the original post you are referring to, and some of the finer details of the software would not be immediately apparent to me now. At least until a careful review, for which I have to admit I don't have a lot of time now. But I will try to at least validate some of your own concerns.

You are absolutely right - the phases of a 14-pole/?? cogs motor will be different than 12-pole/9cogs . You would need to modify the software to have more (I assume more - depends on the # of cogs) PWM steps. Otherwise the rotor will be skipping some of the positions which can lead to uncertain movements - sometimes the next    step in the software would result in the back step rotation of the physical rotor. Which is, I think is what you are experiencing.

I am not so sure how you can make it work at all without using an H-bridge. Arduino's  40mA outputs are not strong enough to drive anything in the physical world (maybe except for the tiniest of the stepper motors). Certainly not any gymbal BLDC I've ever seen. Perhaps you meant "no integrated H-bridge circuit", which would mean that you are using an H-brdge on discrete transistors? I don't know what you mean but if you did not, you should really look into employing one kind of an H-bridge circuit or another. Otherwise you will either fry your Arduino or it simply won't work.

Good luck!
Member Introductions / Try to study here ;)
« Last post by Phebex on May 20, 2016, 02:13:19 PM »
Hello, I'm a newbie here. I came here for 2 weeks ago.
First I want try to make Gimbal for steady cam. But I have nothing. I see many people have same interests with this.
So I'm hunt what I need to build one. Some people managed to make it by using arduino.
So, first think must I have is :
Arduino uno
Mpu6050 (gy521)
Brushless Gimbal motor

I have no knowledge at all about this. Find out anything about arduino code to make brushless rotate, googling about it.
Find your post ( this awesome.

Try your code, but my brushless only shake. Do not know what was wrong at first. Keep reading your articles about Brushless. It makes me more and more insight. I known about pwm, sinusoidal, and etcetera. The Most important is know how brushless work.
For now I assume why my brushless didn't work with your code it's because my brushless using 14 pole magnet. Try with pwmsine for 8 bit make spinning/rotate then stop later. And I not using H bridge.

That's introduced by me.
Motor Control / Re: Updated schematics for a BLDC motor controller
« Last post by ElectroNick on March 31, 2016, 09:39:05 PM »
Jannat, see if you can increase the stepDelay value so the phases are changing slower, and perhaps the pattern may be more clear . One other think I would suggest - comment out the serial communication code around line 71 in the code and re-compile and upload into Arduino again. That serial comm is too slow for the winding phase change and does mess up the normal motor operation. It was there for debugging, I don't know why I didn't take it out of the final code. It's been a couple of years since, I don't remember finer details of the project all that clear now.
Motor Control / Re: Updated schematics for a BLDC motor controller
« Last post by jbachhal on March 31, 2016, 12:55:55 AM »
I recently built the circuit shown in the schematic and connected it to a voltage supply (3.3V) and the arduino programmed using the code provided. After the system is powered up and the potentiometer is adjusted, the motor simply jolts a tiny bit back and forth. I connected LED's in series with the motor windings in hopes of seeing the phase of the system. The bulbs illuminate however, are not in any sort of three phase pattern, instead light up in a strange pattern with a substantial gap before the next "cycle" starts. If you have any idea as to why this would be happening, please let me know as soon as possible as this project is one that must be completed very very soon.
Thank you for any help. It is greatly appreciated.


Motor Control / Re: Arduino BED stepper Manual Control
« Last post by PaulBailey on December 16, 2015, 12:03:18 PM »
Actually there is a way to make your own driver out of a whole bunch of MOSFET transistors  a heap of MOSFET drivers and a heatsink.
Also the issue of microstepping as well as current sensing and feedback would still have to be solved.
You can use an Arduino as a stepper driver, but it will run out of available I/Os really quickly.

circuit board manufacturing
Motor Control / Re: Arduino BED stepper Manual Control
« Last post by MarkN on July 05, 2015, 12:55:15 PM »
G'day All, by the number of "looks" at this site, I am sure, there are a lot of people looking for the same thing, that I want to do.
ie, to drive any AXIS, with a Stepper Motor ( with the appropriate torque) f/r and with speeed control. ( I am not going to correct that, extra "e" in speed, because it takes too long, tippy tapping on the key board, which is why, you should, when visiting, like a Fart in a Phone Box, just say G'day, or, For Ever, Hold Your Breath.)
So, anyways, here is the link......
to see where I am at, the moment. 'n it works, for under a A$100.00, she will drive my axis to heaven 'n back.
That, at least, deserves you to just say "G'day"
Otherwise, why do we even try....Hey!
Just love to hear your, tippy taps.
Mark Needham
or else " off"
Motor Control / Re: Arduino BED stepper Manual Control
« Last post by MarkN on May 30, 2015, 11:34:07 PM »
G'day All, well the rat is leaving the ship.
I have cooked 2 more Arduino boards, and seem to be having all sorts of troubles. The problems are mostly generated by myself, so I am not giving up on the fact that arduino controlling my stepper is unobtainable.
I have jumped ship, to the CNCZONE, and have currently on order 2 different units, which may do the job, or not.

...and this one also.

So that is that. I will keep an eye on this site, for advancements, and thank all participants.
Luck to us All,
Mark Needham
Motor Control / Re: Arduino BED stepper Manual Control
« Last post by MarkN on May 10, 2015, 08:31:22 PM »
G'day All. As is obvious with the lack of postings, I have done bugger all. Heart attacks, cyclones and other stuff has interfered and now I am moving house. Hopefully, I shall get this beasty working, but just not at the moment. My milling machine is currently in storage, so.yeah, may  take a while.
But if anyone, manages to get this all to work in the meantime, be great to hear from you.
Cheeers, Mark N
General Discussion / Good starter kits for kids.
« Last post by jdave on April 11, 2015, 03:27:01 PM »
Hi everyone.   I've been tinkering with stuff professionally and casually all my life(I'm 59) and I'm happy to see my 13 year old grandson showing an interest in electronics and mechanics as well.  I'm looking for some advice on good beginner kits for a kid that age.  I don't live close enough to help him out with things like soldering or advanced techniques so I'm looking right now for very basic kits based either on breadboard or snap together type construction.  Right now I'm leaning towards Arduino or perhaps Lego.  He's had Lego kits and enjoyed them so that would be an extension of what he already is familiar with.   But they can make anything look wonderful online, I'd like to hear from folks who have had actual experience with products because reality is always different from the advertising.
      Also, my ten year old granddaughter has been determined since she was six that she's going to be an architect.  I realize it's a bit off topic but if anyone knows of any kits or software that would be good for her I'd be glad to hear about it as well. 
        Many thanks, and keep on tinkering.
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