Low cost, public domain, stepper analyzer - season 2.

PCR

I have about 20pcbs and for 10 pieces parts

fma

I sent you a message in the private chat; did you get it?

fcwilt

This post is deleted!

zapta

Hi @PCR, did you manage to get it working? Any problems with the design?

arhi

where are you purchasing acs70331 ?! comet don't hold them, jlc don't have them, mouser offer only dev boards, digikey nothing on stock for ages and min order q is 6000 .. I was looking to get them for another project but ..

PCR

@arhi orderd them at digikey.

Best

zapta

@arhi , this is the digikey part I used https://www.digikey.com/en/products/detail/allegro-microsystems/ACS70331EESATR-2P5B3/8120682

Egon.Net

@PCR do you still have spare boards and parts?

Egon.Net

@zapta I really love your project! Just what I was looking for!

arhi

@PCR what part? QFN also or?
@zapta that's QFN I need soic and taht's 2.5A I need 5A ..

I'll probably go then with 5A regular HAL ACS712 .. it's not fancy GMR but regular HAL but at least I can get it easily .... I hoped I can easily get GMR version in soic8 package but..

tenaja

@zapta I'd like to get one of your boards, if you still have one. I sent a private chat message.

zapta

@tenaja, don't have spare boards left but I can make a few for shipping in the US if there is a demand. It will be at cost, and you will need to order the TFT display from buydisplay.com yourself.

PCR

Still have Boards. Will answer all PM today. Stressfull weeks... Sorry

tenaja

@PCR I will take one! (If you can ship to USA.)

zapta

@arhi said in Low cost, public domain, stepper analyzer - season 2.:

@zapta that's QFN I need soic and taht's 2.5A I need 5A ..

SOIC is definitely easier to solder and I would love to find one.

I modified the QFN footprints on the board be easier to hand solder, having longer pads, somewhat similar to the Schmartboard boards.

dc42

In SOIC parts, ACS724LLCTR-05AB-T is very good, much better than ACS712 in our experience. We use them in our latest automated test equipment.

arhi

@dc42 said in Low cost, public domain, stepper analyzer - season 2.:

In SOIC parts, ACS724LLCTR-05AB-T is very good, much better than ACS712 in our experience. We use them in our latest automated test equipment.

Thanks, I'll try to find them, I started using JLCPCB full service recently so I try to go with parts they have (and acs712 they do have on offer). will see what else is there but if I can get easily acs724 (issue with digikey is that shipping is rather expensive so I wait till I have a need for more parts to order something to spread the shipping cost on to more parts as I pay same for 1 and for 1000 parts, same small box) locally I don't mind soldering them myself ... those QFN I really hate and if JLC had them it would be no problem as they would solder them on but ... they don't

droftarts

@zapta's stepper motor analyzer is the star of this Teaching Tech video! https://youtu.be/4iII25DGIdA

Ian

zapta

@droftarts, he did a very good job IMO, precise and informative.

There are two analyzers shown in that video, one with the standard base and another with the enclosed case design. Functionality wise they are identical and the open frame design is easier to build and therefore the default option.

The enclosed case is documented in the link below but is more complex to build so I am not sure it worth it.

https://github.com/zapta/simple_stepper_motor_analyzer/blob/master/case_option.md

And the Onshape design is at https://cad.onshape.com/documents/146b8b994145177887407b23/v/c2dc7870c6f0bf989cd611b5/e/b6453eca2ba530476c30538a

BTW, how does your analyzer progress? Any problems?

droftarts

@zapta I sent it to Tony, who has the equipment and time to put it together! However, we’re waiting for screens to come from China. I think we’re going to use the 411 Blackpill, as the 401 seems unavailable.

Ian