Duet3 Mini + BLtouch - Z Homing problem

karbo90x

Hi Friends,today I have started configuring my new Duet3 mini. But I have a problem when trying to home Z axis,Homeall and Bed Level.

The Homing with Sensorless X and Y axis works very well for me and i'm very happy,because i read that some other users have problems with this configurations...

The Bltouch it's original Antclabs, wires and connections on the board are ok.
I have upgrade the firmware first to version 3.2 (Final) and then to 3.3 (Beta) : there are the same problems.

The case it's this..
-M401,M402 and selftest work perfectly.

-If i move the hotend at the bed center and send (G92 X155 Y155) first and then (G30) the Bltouch works and records Z0.

-If I send Homeall,the X and Y axis go homing correctly,except the Z axis.
It goes in the bed center and start with its downward movement without however deploy the probe.

-If I send Home X firs and then Y separately and then Home Z,the hotend goes in the bed center, starts with its downward movement but the probe doesn't deploy.

This happen with all the other command that use the bltouch too... (G32 ecc) : The Hotend moves on X , Y and Z correctly but the probe doesn't deploy itself and will maybe crush on the bed.

I share the links my config files:
config.g
homez.g
homeall.g
homex.g
homey.g

They are not definitive configurations files,because I'm still working on it and perhaps I'm making mistakes.

Thanks for your help.

Leonardo

Veti

@karbo90x said in Duet3 Mini + BLtouch - Z Homing problem:

ll the other command that use the bltouch too... (G32 ecc) : The Hotend moves on X , Y and Z correctly but the probe doesn't deploy itself and will maybe crush on the bed.

according to this
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview
only 45 7 are pwm capable.

also the config tool only lets you select 4,5 or 7 and not 2

Phaedrux

Here's an example using io3

https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+3+Mini+5++Guide+Part+1:+Wiring/87#s336

https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Mini+5++Guide+Part+2:+Configuration/88#s268

karbo90x

Thank you for your answers.
I have read the guides that you write me last evening,I had already set (IO_3) but as it doesn't work,I change on IO_2 for a test.

Today i have done other tests,check another time the wires,the connections and replace the BLTOUCH with a new one.

To have a comparison,I have check the config files that i use successfully on my Duet3 6HC and i don't undestand where the mistake could be

The problem is still there...

Thanks

Veti

@karbo90x said in Duet3 Mini + BLtouch - Z Homing problem:

IO_2 , IO_3

those are not pwm capable,

fcwilt

@Veti said in Duet3 Mini + BLtouch - Z Homing problem:

@karbo90x said in Duet3 Mini + BLtouch - Z Homing problem:

IO_2 , IO_3

those are not pwm capable,

Where is that mentioned?

The docs for the Duet 3 Mini 5 say this only:

5 Pin KK connectors: IO_0 through IO_4 these are for endstop switches, Z probes, filament monitors and other low-voltage I/O functions. Each connector provides both 3.3V and 5V power. The inputs will tolerate up to 30V. The outputs are 3.3V signals levels with 470R series resistors.

Frederick

Sindarius

@fcwilt said in Duet3 Mini + BLtouch - Z Homing problem:

those are not pwm capable,

https://duet3d.dozuki.com/Wiki/Duet_3_Mini_5plus_Hardware_overview#Section_IO_port_pin_capabilities

Veti

my bad. i looked at the duet 3 pwm pins

Phaedrux

@karbo90x said in Duet3 Mini + BLtouch - Z Homing problem:

The problem is still there...

If you followed the guides I posted to use io3 and the config I posted it should work.

Please post a photo of your wiring and post your current config files.

What specifically doesn't work?

fcwilt

@Sindarius said in Duet3 Mini + BLtouch - Z Homing problem:

https://duet3d.dozuki.com/Wiki/Duet_3_Mini_5plus_Hardware_overview#Section_IO_port_pin_capabilities

Thanks.

@Phaedrux - perhaps that information regarding pwm should be included in the section I mentioned.

https://duet3d.dozuki.com/Wiki/Duet_3_Mini_5plus_Wiring#Section_Description_of_Connectors_and_indication_LEDs

Frederick

Phaedrux

@fcwilt I've added a note that io_1,2,3 are PWM capable.

fcwilt

@Phaedrux said in Duet3 Mini + BLtouch - Z Homing problem:

@fcwilt I've added a note that io_1,2,3 are PWM capable.

Grand. It can be a little confusing where different bits of information are here and there.

Thanks.

Frederick

Sindarius

@fcwilt

M558 P9 C"^io2.in" H5 F200 T6000                   ; set Z probe type to bltouch and the dive height + speeds

This line looks wrong I believe it should be

M558 P9 C"io2.in" H5 F200 T6000

Using a pullup doesn't seem to make a difference on my setup. So don't worry about changing it.

karbo90x

My connection is the same as that in your guide of Ender3.Tomorrow i try to do a new complete wires connection from board to Bltouch.

The config file and Homing file are the same of the first post i write.Now the only difference is the IO_3.

The problems are the same of the first post.

Thanks.

karbo90x

@Sindarius said in Duet3 Mini + BLtouch - Z Homing problem:

@fcwilt

M558 P9 C"^io2.in" H5 F200 T6000                   ; set Z probe type to bltouch and the dive height + speeds

This line looks wrong I believe it should be

M558 P9 C"io2.in" H5 F200 T6000

Yes,but i have try this modify.Thanks

Phaedrux

; Z-Probe
M950 S0 C"io3.out"                                 ; create servo pin 0 for BLTouch
M558 P9 C"^io3.in" H5 F120 T6000                   ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-44 Y-17 Z2                              ; set Z probe trigger value, offset and trigger height
M557 X5:190 Y5:215 S10                             ; define mesh grid

M280 P0 S10 ; deploy BLTouch
M280 P0 S90 ; retract BLTouch

G91                     ; relative positioning
G1 H2 Z5 F6000          ; lift Z relative to current position
G1 H1 X-240 Y-240 F1800 ; move quickly to X and Y axis endstops and stop there (first pass)
G1 X5 Y5 F6000       ; go back a few mm
G1 H1 X-240 Y-240 F360  ; move slowly to X and Y axis endstops once more (second pass)
G90                     ; absolute positioning
G1 X100 Y100 F6000        ; go to first bed probe point and home Z
G30                     ; home Z by probing the bed

fcwilt

From your configuration file:

; Endstops
M574 Z1 S2					   ; configure Z-probe endstop for low end on Z
                                       
; Z-Probe BLtouch
G30 S-2

dc42 has confirmed that M574 Z1 S2 is not correct.

See if M574 Z0 makes any difference. I don't think it will but it cannot hurt.

The G30 S-2 should not be there. You are trying to probe the bed during the "configuration phase". It may be ignored but remove it just the same.

You have the deployprobe.g and retractprobe.g files with the appropriate M280 command in each?

Frederick

karbo90x

Hi friends, I solve the problem finally ...

I made the changes you told me and finished my homing and config files.
Unfortunately, even so and with a whole new wiring for the BLTOUCH...Not working yet...

Then I got an idea, but I wasn't sure it will work: I bought a new SD card, I copied the config files directly from "Original" SD. and WOOOOW all works magically at the first test!!!

How is it possible ???

Now I'm really happy!!
Thank you for yours suggestions which have been a great help to improve my knowledge and my configurations files.

Thanks so much to everyone!!!

fcwilt

@karbo90x said in Duet3 Mini + BLtouch - Z Homing problem:

Then I got an idea, but I wasn't sure it will work: I bought a new SD card, I copied the config files directly from "Original" SD. and WOOOOW all works magically at the first test!!!

Glad to hear you got it working.

I have no idea why using a new SD card would fix it.

Frederick