Configuring S42B Close Loop Stepper Controller

Adamfilip

S42b - duet bob
Dir -> dir +
Step -> step +
En -> En +
Gnd -> gnd
5v -> 5v +
24 -> 24v + on power supply

Is this correct?

fcwilt

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

I am going to add two of the BigtreeTech S42B Closed Loop Stepper motor addons to my Custom CoreXY 3D printer.

Just out of curiosity why are you going to do that?

Everything I have read says there is no reason to do so.

Thanks.

Frederick

Adamfilip

I run into issue with occasional layer shifts that I havent been able to resolve.
so im trying this.

arhi

@fcwilt said in Configuring S42B Close Loop Stepper Controller:

Everything I have read says there is no reason to do so.

I found bunch of "tests" showing they are not precise (moire patterns worse then bad motors on microstepping) but I found also ppl saying they are awesome and that all their artifacts are now gone... so I ordered 4 drivers (only drivers no motors), attached to my own motors and now am thinking about good test jig to test how accurate they are ... will see if I'll attach some super high precision encoders or go another way about them.. but in any way more ppl testing them the better, the hal sensor precision is not bad and the software is not that hard to write for that so in theory they should be very good... (so far I just turned them on and I don't like the sound I hear but let's see if I manage to make some test during NY holidays)

Adamfilip

Had someone with Electronics experience help me figure out how to connect them.
hope this is right lol

dc42

You will damage the expansion breakout board with the driver connected like that. Disconnect the driver 5V common pin from all 3 pins on the breakout board. Connect it to 5V+ on one of the servo connectors on the breakout board instead.

Adamfilip

Servo connectors? Do you mean the 5v+ on the Two Heater6&7 areas?

dc42

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

Servo connectors? Do you mean the 5v+ on the Two Heater6&7 areas?

Yes.

Adamfilip

Here is a revised diagram

dc42

Still not right:

Leave the breakout board Step+, Dir+ and Enable+ not connected to anything (and not connected to each other)
Connect +5V from the breakout board to COM on your driver

Adamfilip

Ok so your suggesting like this

arhi

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

BigtreeTech S42B Closed

Is this working for you ?!

I'm doing the simplest thing possible

DIR -> GND
EN -> GND
GND -> GND
VM -> 12V
5V -> 5V
STEP -> 0-5V gpio

and darn thing won't move ?!?! loosing my hair for 2 days already

alankilian

@arhi said in Configuring S42B Close Loop Stepper Controller:

EN -> GND

I don't mean to be Captain Obvious, but do you have the system configured for enable=low?

It looks like it can be set to either.

Also, do you have both power supply grounds connected together and to GND on the servo?

Adamfilip

I have just wired up my S42B and Motors

After i changed settings, I do calibrated and it started working

This is my current settings for it,

M569 P5 R0 S0 T3.33:3.33:5:0                                      ; physical drive 0 goes backwards previously P0, p5 is on expansion board
M569 P8 R0 S0 T3.33:3.33:5:0                                  ; physical drive 1 goes backwarsa previously P1, p8 is on expansion board
M569 P2 S0                                       ; Z physical drive 2 goes backwards
M569 P3 S1                                       ; Extruder physical drive 3 goes Forwards
M584 X5 Y8 Z2 E3                                 ; set drive mapping , old X0 Y1 
M350 X16 Y16 Z32 I0                              ; configure microstepping without interpolation, previously 32
M350 E16 I1                                      ; configure microstepping with interpolation
M92 X100 Y100 Z1593 E409             ; set steps per mm
M566 X600 Y600 Z20 E800 ; Set maximum instantaneous speed changes (mm/min) JERK
M203 X9000 Y9000 Z1500 E10000 ; Set maximum speeds (mm/min)
M201 X1000 Y1000 Z250 E5000 ; Set accelerations (mm/s^2)
M906 X1400 Y1400 Z1500 E1300 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
M572 D0 S0.0125 ; Pressure Advance

Adamfilip

Woohoo Got it working. check out demo
https://youtu.be/Qz6EoinibEc

Phaedrux

@Adamfilip Very cool. Thanks for sharing. Let us know how it works out in practice.

arhi

@alankilian said in Configuring S42B Close Loop Stepper Controller:

I don't mean to be Captain Obvious, but do you have the system configured for enable=low?

tried both !Enable and Enable configuration for the good measure, no help

Also, do you have both power supply grounds connected together and to GND on the servo?

yes

Also tried 1234 dip's as 1111 (default, first two are what I understand microstepping, third is open/closed control and fourth is write enable for calibration), 1100, 1101, 0000, 0011, 0001 ... no change

at one point I got it to "turn" but was going into "error" after few steps but most of the time it just won't turn at all ... wasted too much time with it I'll try a second driver and a second motor to be sure but I'm moving with my testing to other systems I think this one was just not meant to be

fcwilt

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

Woohoo Got it working. check out demo
https://youtu.be/Qz6EoinibEc

In real world printing what conditions would correspond to displacing the position with your thumb as you did in your video?

Thanks.

Frederick

Adamfilip

@fcwilt none this was as test to see if it would return back to position. this is to help recover from layer shifts.
if nozzle gets snagged on something.. its an issue that has been a problem for me and I havent found another mechanical reason to resolve it.

fcwilt

@Adamfilip said in Configuring S42B Close Loop Stepper Controller:

if nozzle gets snagged on something.. its an issue that has been a problem for me and I havent found another mechanical reason to resolve it.

I've seen the nozzle get snagged on bits of the previous layer sticking up, most always in the area of the gap created by holes the are being made in a vertical section of the object.

It would be interesting to see how these devices would behave when that happened.

I may have to try closed-loop.

Thanks.

Frederick