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

zapta

I am experimenting now with a new screen whose purpose is to evaluate the signal and phase cleanness. It takes the signals from the two coils and draw them as https://en.wikipedia.org/wiki/Lissajous_curve .

Here what you get from a well fed stepper with good microsteps interpolation, a balanced, large and smooth circle.

And this is what you see in a system where the supply is insufficient to drive the current at high movement speeds. Skinny and distored.

BTW, each rotation along the circle is equivalent to 4 full steps that make up a single 'electronic rotation'.

These patters are shown in real time while the printers operates. This screen is experimental, need to clean it up and include in the official release.

EDIT: here is an interesting animation from Wikipedia that shows how it works:

https://en.wikipedia.org/wiki/Lissajous_curve#/media/File:Circular_Lissajous.gif

PCR

PCBs are here,

i can supply the pcb, the two sensors and the eprom.
due too some family buisness i do not know if i can solder them in the next weeks. So selling the parts only would be the best for me. Best

fma

No problem to sold them myself.
How do we proceed to pay you?

PCR

Contact me via PM

PCR

So for the price.

5 € the pcb
2,5€ for the sensors and eprom
1€ for 40 pin connector
1€ for resistors

due to a mistake at digikey the capacitors are to small.. So these have to be self sourced ( easy)

shipping with tracking 8€ without 4€ in europe
germany 3 € shipping

fcwilt

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

So for the price.

5 € the pcb
2,5€ for the sensors and eprom
1€ for 40 pin connector
1€ for resistors

due to a mistake at digikey the capacitors are to small.. So these have to be self sourced ( easy)

shipping with tracking 8€ without 4€ in europe
germany 3 € shipping

Do you have any for sale?

Can you ship to the US?

Thanks.

Frederick

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.)