Anybody wants a stepper motor analyzer?

zapta · 29 Dec 2021, 19:59

@dogma2k said in Anybody wants a stepper motor analyzer?:

I still have a problem that as soon as the motors are working, the display does not react at all or almost not at all

Can you explain what what you mean? Chan you change pages? Do you see any reading on the main page?

Per my previous post, it seems that your sensors need zero calibration. This is done in the Settings page (accessible from the main page) with the motor disconnected.

Dogma2k · 29 Dec 2021, 20:16

@zapta said in Anybody wants a stepper motor analyzer?:

@dogma2k said in Anybody wants a stepper motor analyzer?:

I still have a problem that as soon as the motors are working, the display does not react at all or almost not at all

Can you explain what what you mean? Chan you change pages?

Would you have to recognize property in the two videos what I mean (if not, I'll make better ones)
If no stepper has been used, I can switch through the menus, as soon as the stepper has moved once, the displays can no longer be operated.

I'll do the zeroing with disconnected stepper afterwards when I'm back.

Th0mpy · 1 Jan 2022, 12:05

@dogma2k I had this issue on my first analyzer I boiled it down to a couple things.

As @zapta mentions, if you don't cut the pins there may just enough bite into the back of the LCD which shorts things out. I pulled the connectors out, recut, and used some 3M VHB to secure the LCDs.

Finally, double check the castellated pins on the PICO and make sure they're solid. If you used a thicker adhesive behind the PICO it might prevent good connections.

Dogma2k · 1 Jan 2022, 12:05

@th0mpy said in Anybody wants a stepper motor analyzer?:

@dogma2k I had this issue on my first analyzer I boiled it down to a couple things.

How can you reduce the choice, I really don't have a clue about it yet.
I took the APPLICATION.uf2 file from the temp directory on github, was it wrong?

Finally, double check the castellated pins on the PICO and make sure they're solid. If you used a thicker adhesive behind the PICO it might prevent good connections.

Now the analyzers just don't run properly when the steppers are moving.
So it is more as if the Pico does not have enough power to process the incoming data quickly enough

zapta · 1 Jan 2022, 17:17

@dogma2k ,

Do you have the same problem on all four analyzer or just a few?
If you power the analyzers from a power supply on your printer, I suggest, as an experiment, to power one of them from a regular USB 5V charger and see if the problem persists.

A Former User · 2 Jan 2022, 00:07

Hey
Is it possible to indicate layer shifts with this analyser?
Richard

zapta · 2 Jan 2022, 19:37

@gruna-studio, that a good question. I guess it depends on the cause. E.g.

Intermittent wiring connection - It detects idling and electrical stepping error events so will probably detect.

Low current/torque due to an high speed - it will probably diagnose it in the current vs speed histogram page.

Mechanical binding - I am not sure about that. May need to research how that condition is reflected on the electrical signals. Also, the analyzer measures only current, monitoring also the stepper voltage may help here.

Dogma2k · 2 Jan 2022, 19:46

@zapta said in Anybody wants a stepper motor analyzer?:

@dogma2k ,

Do you have the same problem on all four analyzer or just a few?

Yes all four analyzer have the same problem.

If you power the analyzers from a power supply on your printer, I suggest, as an experiment, to power one of them from a regular USB 5V charger and see if the problem persists.

I'll try, but don't have much hope because I've already built a 24V / DC to 5V / DC power supply into the case

Or could it be because of the APPLICATION.uf2 file I used from the temp folder in github?

Dogma2k · 4 Jan 2022, 11:30

@zapta and everyone else who has an idea
Today I had some time to deal with the problem a little more intensively.

The result is that it doesn't matter how I supply the analyzer with voltage
1 analyzer -> everything OK (if stepper on or off)
2 Analyzer -> everything OK (if stepper on or off)
3 Analyzer -> if the stepper is off then everything is OK, if the stepper is on it does not immediately become sluggish but after approx. 10 seconds all of them are no longer really operable
4 Analyzer -> if the stepper is off then everything is OK, when the stepper is on it is immediately sluggish and inoperable

The combination of which analyzers are used together does not matter, it always gets the above result
When I use two different voltage sources, the above result counts.

Are there any influences that can arise if more than 2 are switched on at the same time. Diodes on each of the + 5V / DC wires of the Pico may

zapta · 4 Jan 2022, 15:53

@dogma2k, that sounds bad. Everything should work.

Did you make any hardware changes to the board?
Are you the exact same components in the original schema?
What TFT module are you using?
What version of the firmware UF2 file do you use?

The original schema is here
https://github.com/zapta/simple_stepper_motor_analyzer/blob/main/kicad/stepper_analyzer.pdf

The original firmware is here
https://github.com/zapta/simple_stepper_motor_analyzer/releases/download/F1.0.4/APPLICATION.uf2

If you want, you can send me one analyzer (to the US) and I will look at it and send you back.

dc42 · 4 Jan 2022, 15:57

@dogma2k is your PSU powerful enough to supply current to all 4 Picos and LCD screens? Colour TFT screens draw quite a lot of current.

Dogma2k · 4 Jan 2022, 17:07

@dc42
I hope so. Both PSU have 5V/DC 5A

Dogma2k · 13 Jan 2022, 18:43

Anyone have an idea? Something like soldering a diode?
It would be a shame if I had to take it all apart again because it doesn't work

PS it may be that an analyzer is defective (or the engine). Yes, I know I didn't zero it

rjenkinsgb · 13 Jan 2022, 19:11

@dogma2k said in Anybody wants a stepper motor analyzer?:

Anyone have an idea?

What cable or cables are you using to power them?

A lot of cheap USB cables are really for data only and have ludicrously thin cores for the power connections, causing serious voltage drops as soon as you try to run anything that takes significant current.

I've even had ones advertised as "high current" / "Heavy duty" that will not run USB devices that need 200 - 300mA.

Oddly enough, the early (typically cream coloured) ones I have work fine!

zapta · 13 Jan 2022, 20:02

@dogma2k, can you swap the connections of two analyzers to see if the problem follows the stepper or the analyzer?

BTW, some of the artifacts, but not the noise you marked with arrows, are due to the screen being refreshed during the camera's exposure. You can pause the analyzer (using the || button at the bottom) if you want to avoid it.

Dogma2k · 14 Jan 2022, 07:44

@rjenkinsgb
At the moment, the power supply comes from a 5V / 5A power pack with 2x1mm² wires to the analyzer housing. In the housing, USB cables are used to distribute to the analyzers.

The cables to and from the analyzer for the motors are LIYCY-OB 4x0.5mm² (i.e. shielded cable)

However, I think that the cross-section of the eagle of the USB cable is sufficient. Because the problem only occurs when more than 2 analyzers work at the same time with active engines (with 3 it gets worse over time)

However, I noticed that if I press a button longer with 4 active analyzers, the display then reacts. Just not with the analyzer at the top left, it even switches back and forth on its own

Dogma2k · 14 Jan 2022, 07:54

@zapta said in Anybody wants a stepper motor analyzer?:

@dogma2k, can you swap the connections of two analyzers to see if the problem follows the stepper or the analyzer?

I can at least swap the analyzers to see if the noise moves with it. But only tonight

BTW, some of the artifacts, but not the noise you marked with arrows, are due to the screen being refreshed during the camera's exposure. You can pause the analyzer (using the || button at the bottom) if you want to avoid it.

That with the II is a good tip.

Another question, I just have the APPLICATION.uf2 from https://github.com/zapta/simple_stepper_motor_analyzer/tree/main/temp
taken and copied. Is this still a beta version or is it already stable?

zapta · 14 Jan 2022, 16:26

@dogma2k , I am not sure what is in that temp dir.

This is the latest stable release of the firmware

https://github.com/zapta/simple_stepper_motor_analyzer/releases/tag/F1.0.4

Dogma2k · 14 Jan 2022, 19:08

@zapta
So the artifacts with the analyzer. So I can actually rule out everything else.
If I disconnect the stepper with the noise and only have the 3 other analyzers in operation, there are no problems (regardless of whether the steppers are on or off).
Did I possibly break a current sensor while soldering or simply get it defective?

P.S. Thx for the link

zapta · 14 Jan 2022, 23:24

@dogma2k, it's not clear from 'only have the 3 other analyzers in operation' if you tried to monitor the motor that had noise with another analyzer.

Please try this two cases:

Operate the analyzer that gave you noise with another motor in and see if you still see noise with the new motor.
Operate the motor that gave you noise with another analyzer and see if you still see noise with the new analyzer.

This tell us if the problem is related to the motor and its driver or to the analyzer.

Anybody wants a stepper motor analyzer?

Robert J.