Hi,
I'v just got my Robin Nano v3.1 here with TMC2209 drivers. But I couldn't find any accurate information about the current I need for my steppers.
Contacting Anet I didn't get any answer... So maybe anyone got an idea?

My stepper drivers are TMC2209 V2.0 MKS.
I'd like to use UART mode on the Robin Nano v3.1. So do I have to setup the potentiometer on the drivers itself anymore or is the current set up in digital manner?

Edited 2 time(s). Last edit at 02/01/2022 06:14AM by cysign.

Internet says there is no such thing as a anet a9 plus

But basically you have to examine all the stepper motors for any labels for clues. Looking for a current rating

You're right...it's a typo I corrected!

I already googled for one stepper....but there are different current settings on the internet for this thing.

Can't see the z-axis labels without unmounting them. But the others are all the same:

Extruder: STEP MOTOR 42SHDC3025-24B LOT NO.200730
Y-Axis: STEP MOTOR 42SHDC3025-24B LOT NO.200905
X-Axis: STEP MOTOR 42SHDC3025-24B LOT NO.200903

They're rated 0.9A on this blog:
[caggius.wordpress.com]

Whilst on this site they're marked for 1.5A:
[www.druckzeug.de]

I found [3dprint.wiki]

Which looks like they might know what they are talking about.

so Rated Current 0.9A sounds good.

Now note this is Peak current * 0.707 for RMS current, ie what TMC's use ie a absolute max value of 636.3

Also check the value of the r-sense resistor on your stepper drivers. most are 0.11 ohms, but some are not.

Attached is a picture of one of my drivers. Looks like R7 = R110 = 0,11 Ohm would be Rs.

What do you mean by 636.3?
Multiplicationfactor between RMS current and peak current?


//edit: Ok, I see => 0,9A Peak *0,707 = 0,6363A RMS

So do I have to set the current using the potentiometer on the PCB or do I set it digitally using Uart? I've never been using uart on stepper drivers...

Edited 3 time(s). Last edit at 02/01/2022 01:46PM by cysign.

If you can enable uart, you can set it in firmware. this is the point of uart, to be a able to set all the stepper driver parameters in software/firmware

Edited 1 time(s). Last edit at 02/01/2022 05:48PM by Dust.

There'a a Marlin repo on github for the Robin Nano v3.x - so it should be possible